2021 Audi Q7 Trailer Wiring

Please Select your Vehicle to See Exact Fit Parts

Keep Your 2021 Audi Q7 in Top Shape with Quality Trailer Wiring

Whether you’re repairing or upgrading your Trailer Wiring, using high-quality parts is key to keeping your 2021 Audi Q7 looking sharp and performing at its best. At Advance Auto Parts we carry a wide selection of dependable options, including Trailer Wiring Kits and Trailer Wiring Harness. Whether you’re replacing a damaged part or enhancing your truck’s style and protection, you’ll find exactly what you need to get the job done right.

Top-Rated Trailer Wiring from Trusted Brands

Looking for a reliable Trailer Wiring? We’ve got you covered with options from brands you know and trust like Hopkins. For example, Hopkins Trailer Wiring start at just $41.99 with an average 4.3 star rating. With over 195 reviews and a solid 3 star average, you can shop with confidence knowing other Audi Q7 owners approve.

Competitive Prices and Extensive Inventory

The average price for a 2021 Audi Q7 Trailer Wiring at Advance Auto Parts is around $39.49, with a range that starts at $22.99 and goes up to $104.99. With 12 options in stock from 2 trusted brands, finding the right fit is easy. Popular picks like Dual-Output 7/4-Way Connector (Plugs into USCAR), Replacement USCAR Socket with 24in. Wires (Vehicle Side), and Replacement OE 4-Way Flat Socket (T s into USCAR) start at just $26.99 and offer a great balance of form and function.

Explore Related Parts

While you’re upgrading or replacing your Trailer Wiring, don’t forget to check out other key components like Trailer Hitches. At Advance Auto Parts, we’re here to help you keep your 2021 Audi Q7 in peak condition, inside and out.

Essential 2021 Audi Q7 Trailer Wiring

CURT – Dual-Output 7/4-Way Connector (Plugs into USCAR) (Part No.55774)

Dual-Output 7/4-Way Connector (Plugs into USCAR)

from

$36.99
A CURT custom wiring connector (sometimes called a T-connector) is a simple, plug-and-play electrical device that eliminates the need for cutting, splicing and soldering when installing vehicle-to-trailer wiring. Most vehicles do not come ready to tow. Unless your vehicle has a towing package, it is probably not equipped with a trailer wiring connector. This is where CURT’s custom wiring connectors come into play. A custom wiring connector uses a single original equipment plug to plug into a special socket provided by your vehicle. Though this option is not available on every vehicle, some automotive manufacturers design their vehicles to be easily equipped for towing by supplying a socket, integrated into the vehicle’s electrical system, to readily accept a custom wiring connector. With a CURT custom wiring connector, there is no need to tap into the taillight assembly because a special socket is already provided. This special custom wiring connector actually provides two connector sockets for a multipurpose option. It plugs into an OEM connector and offers a 4-way flat and 7-way RV blade connector. It comes with a mounting bracket for easy installation and is designed to be a custom wiring option for a variety of vehicles (see application info to verify fitment). CURT custom wiring connectors are designed to be long-lasting and simple to install. They come with dust covers to keep your connector clean when not in use.

Product Features:
  • Plugs into USCAR socket to provide 4-way and 7-way trailer wiring connectors
  • Fits USCAR-equipped vehicles with factory tow plugs only
  • Simple plug-and-play design eliminates the need for cutting or splicing
  • 4-way flat output connects tail lights, brake lights and turn signals
  • 7-way RV blade socket adds reverse lights, electric brakes and auxiliary power
  • Dust covers included to keep connectors clean when not in use
  • Slit loom keeps wires contained and well protected
  • Metal bracket securely mounts wiring to the vehicle or trailer hitch
See More

Hopkins – Wiring Kit (Part No.40955)

Wiring Kit

from

$42.99
Tow more than one trailer? Multi-Tow design feature adds multiple towing options from one connector by providing sockets for towing both 7 blade and 4 flat trailers. This connector is Plug-In Simple! with no cutting or splicing, saving you time by utilizing an OEM connector to create an exact fit for easy installation and maximum weatherproofing.

Product Features:
  • Multi-Tow provides multiple towing options from one connector
  • Plug-In Simple! Wiring Kit
  • Utilizes OEM connectors create an exact fit and maximum weatherproofing
  • Includes mounting bracket and hardware
  • Impact and corrosion resistant
  • Fits in standard 7 blade bracket
  • Includes Step-By-Step Instructions
See More

Husky Towing – Vehicle Side, 7-Way Round, Without Lead Wire (Part No.30175)

Vehicle Side, 7-Way Round, Without Lead Wire

from

$17.99
Husky Towing Products offer innovative designs, high quality, custom installation and safe, easy operation. Husky is source for a complete line of hitches, electrical products and towing accessories.

Product Features:
  • Durable Lid Opens 180 Degrees
  • Ultimate Weatherproofing
  • Compatible With Ford, GM And Other Popular Tow Vehicles
  • Plug-In Simple(R) For Quick And Easy Installation Or Replacement
See More

Hopkins – Wiring Kit (Part No.41155)

Wiring Kit

from

$25.99
Dont splice onto your vehicles factory wiring harness. Simply plug in this Hopkins? vehicle wiring kit featuring exact OEM matching connectors for a perfect weather-tight fit. This kit includes the accessories needed to get you towing faster.

Product Features:
  • Plug-In Simple? Wiring Kit
  • Utilizes OEM Connectors For Enhanced Fit And Weatherproofing
  • Includes Vehicle Side 4 Flat
  • Corrosion Resistant Terminals
  • Impact And Corrosion Resistant
  • Includes Dust Cover And Grease Packet To Prevent Corrosion
  • Includes Step-By-Step Instructions
See More

CURT – Replacement OE 4-Way Flat Socket (Plugs into USCAR) (Part No.55515)

Replacement OE 4-Way Flat Socket (Plugs into USCAR)

from

$32.99
A CURT custom wiring connector (sometimes called a T-connector) is a simple, plug-and-play electrical device that eliminates the need for cutting, splicing and soldering when installing vehicle-to-trailer wiring. Most vehicles do not come ready to tow. Unless your vehicle has a towing package, it is probably not equipped with a trailer wiring connector. This is where CURT’s custom wiring connectors come into play. A custom wiring connector uses a single original equipment plug to plug into a special socket provided by your vehicle. Though this option is not available on every vehicle, some automotive manufacturers design their vehicles to be easily equipped for towing by supplying a socket, integrated into the vehicle’s electrical system, to readily accept a custom wiring connector. With a CURT custom wiring connector, there is no need to tap into the taillight assembly because a special socket is already provided. This custom wiring connector provides a 4-way flat connector socket and is designed to be a custom wiring option for a variety of vehicles (see application info to verify fitment with your vehicle). CURT custom wiring connectors are designed to be long-lasting and simple to install. They come with dust covers to keep your connector clean when not in use.

Product Features:
  • Plugs into USCAR socket to provide 4-way flat trailer wiring connector
  • Simple plug-and-play design eliminates the need for cutting or splicing
  • 4-way flat output connects tail lights, brake lights and turn signals
  • Dust cover included to keep connector clean when not in use
  • Slit loom keeps wires contained and well protected
  • Backed by a limited one-year warranty
See More

CURT – Replacement OE 7-Way RV Blade Socket (Plugs into USCAR) (Part No.55415)

Replacement OE 7-Way RV Blade Socket (Plugs into USCAR)

from

$22.99
Like trailer hitches and ball mounts, electrical connectors range all over the board in shape, size and capability, but no matter what your trailer’s electrical functions are, you need a solid connection to keep the power flowing and ensure safety on the road. CURT electrical connectors are designed and manufactured to give you a reliable connection every time you plug in your trailer. This 7-way RV blade connector is designed to plug into a USCAR socket and supply power for tail lights, turn signals, electric trailer brakes, a 12-volt battery, reverse lights and brake lights, as well as a ground connection. It is intended to be a replacement trailer connector, plugging into a standard USCAR socket (see application info to verify fitment with your vehicle). It features rust-free black plastic construction and comes with a spring-loaded cover to keep out dust and water. This 7-way RV blade connector is a female-end socket, specifically designed for the vehicle side of the connection.

Product Features:
  • Plugs into USCAR socket to provide 7-way RV blade trailer wiring connector
  • Simple plug-and-play design eliminates the need for cutting or splicing
  • 7-way connects tail, brake, reverse, turn signals, brakes and auxiliary power
  • Spring-loaded dust cover keeps connector clean when not in use
See More

CURT – Multi-Function Taillight Converter (Part No.56236)

Multi-Function Taillight Converter

from

$104.99
Rain, road grime and salt can deal a vicious blow to your trailer wiring, and it takes electrical components with an extra-thick shell to stand up to the elements. The CURT multi-function electrical converter is an advanced taillight converter that offers the ultimate in vehicle compatibility and weather resistance, giving you a reliable wiring connection any season of the year. The potted design seals the internal electrical components in a watertight enclosure and is filled with a solid compound to protect against impacts, vibrations and moisture for long-lasting use, even on the exterior of the vehicle. The converter also features our advanced surface mount technology (SMT), using smaller components mounted directly to the surface of the circuit board. This produces lower resistance, reduced heat generation, longer life cycles and higher reliability. The CURT multi-function electrical converter comes with pigtail wires that are able to be spliced into two-wire, three-wire or PWM wiring system with combined stop and taillights. It converts any of these systems to a simple two-wire system, using a standard 4-way flat output, to be compatible with most trailer wiring. The converter is controlled using a microcontroller that is able to sense the current passing through it, allowing for quick reaction to dangerous conditions such as overload and short circuits. It also filters unwanted input signals to protect your wiring systems and uses a mere seven volts for low-voltage operation. The CURT multi-function taillight converter is a heavy-duty electrical converter for virtually any vehicle-trailer combination. It comes with color-coded wires and an easy-to-read wiring guide, as well as a dust cover to protect the 4-way flat connector. This package also includes four snap locks for faster, more secure splicing. A powered converter wiring kit #55152 is also required for installation.

Product Features:
  • Converts 2-wire, 3-wire or PWM ST system to 2-wire trailer light wiring
  • Potted enclosure significantly increases water and vibration resistance
  • 4-way flat output connects tail lights, brake lights and turn signals
  • Constructed with SMT circuitry for better performance and durability
  • Microcontroller senses current to rapidly react to overload
  • Provides improved overload, short-circuit and thermal protection
  • Low-voltage operation allows function down to seven volts
  • Color-coded wires with wiring guide for easier installation
  • Snap locks included for fast, secure splicing
  • Dust cover included to keep connector clean when not in use
See More

CURT – Replacement OE 7-Way RV Blade Socket (Twists into USCAR) (Part No.56415)

Replacement OE 7-Way RV Blade Socket (Twists into USCAR)

from

$25.99
Like trailer hitches and ball mounts, electrical connectors range all over the board in shape, size and capability, but no matter what your trailer’s electrical functions are, you need a solid connection to keep the power flowing and ensure safety on the road. CURT electrical connectors are designed and manufactured to give you a reliable connection every time you plug in your trailer. This 7-way OEM USCAR replacement connector is designed to plug into a twist-in OEM vehicle socket and supply power for tail lights, turn signals, electric trailer brakes, a 12-volt battery, reverse lights and brake lights, as well as a ground connection. It features rust-free black plastic construction and comes with a spring-loaded cover to keep out dust and water. This 7-way RV blade connector is a female-end socket, specifically designed for the vehicle side of the connection (see application info to verify fitment with your vehicle).

Product Features:
  • Plugs into USCAR socket to provide 7-way RV blade trailer wiring connector
  • Twist-in, plug-and-play design eliminates the need for cutting or splicing
  • 7-way connects tail, brake, reverse, turn signals, brakes and auxiliary power
  • Spring-loaded dust cover keeps connector clean when not in use
See More

Hopkins – Wiring Kit (Part No.40974)

Wiring Kit

from

$41.99
Tow more than one trailer? This exact OEM replacement Multi-Tow design features multiple towing options from one connector by providing sockets for towing both 7 blade and 4 flat trailers. This connector is Plug-In Simple! with no cutting or splicing, saving you time by utilizing an OEM connector to create an exact fit for easy installation and maximum weatherproofing.

Product Features:
  • Multi-Tow provides multiple towing options from one connector
  • Plug-In Simple! Wiring Kit
  • Utilizes OEM connectors create an exact fit and maximum weatherproofing
  • Impact and corrosion resistant
  • Pre-greased terminals for added protection
  • Includes Step-By-Step Instructions
See More

CURT – Replacement USCAR Socket with 24in. Wires (Vehicle Side) (Part No.56229)

Replacement USCAR Socket with 24in. Wires (Vehicle Side)

from

$26.99
Like trailer hitches and ball mounts, electrical connectors range all over the board in shape, size and capability, but no matter what your trailer’s electrical functions are, you need a solid connection to keep the power flowing and ensure safety on the road. CURT electrical connectors are designed and manufactured to give you a reliable connection every time you plug in your trailer. This 7-way USCAR replacement harness is designed to replace an existing USCAR plug and supply power for tail lights, turn signals, electric trailer brakes, a battery, reverse lights and brake lights, as well as a ground connection. It features rust-free black plastic construction and comes with color-coded wires and 24″ of bonded wire for easy splicing into your vehicle’s wiring system. This 7-way USCAR connector is a female-end socket, specifically designed for the vehicle side of the connection.

Product Features:
  • Replaces damaged or missing USCAR vehicle harness
  • Includes 24″ color-coded, bonded wires for easy installation
See More

CURT – Replacement OE 4-Way Flat Socket (T s into USCAR) (Part No.55384)

Replacement OE 4-Way Flat Socket (T s into USCAR)

from

$38.99
Stress is the last thing you should feel when towing a trailer — whether you’re hauling your RV to that favorite camping destination, your ATVs up to the hunting grounds or your fishing boat to the new hidden hotspot. At CURT, we think your towing equipment should add to the enjoyment of your experience, not detract from it. CURT custom wiring connectors are the easiest way to outfit your vehicle with a CURT trailer wiring connection. They are built with some of the most advanced technology in the industry, and each one is custom-fitted to work with a specific make and model. Some automotive manufacturers install a special socket on the vehicle to be used for vehicle-to-trailer wiring. Though this special socket is not equipped on every vehicle, a CURT custom wiring connector (also called a T-connector) utilizes the socket for simple, stress-free installation. Rather than requiring you to cut, splice and solder into your vehicle’s wiring system, the custom wiring connector uses a single OEM-compatible plug and instantly provides a standard vehicle-to-trailer wiring connection, typically in the form a 4-way flat. All CURT custom wiring connectors are made vehicle-specific for the easiest possible installation and the best fit. This particular connector provides a 4-way flat socket while retaining use of the existing OEM socket. It is designed to be a custom wiring option for a variety of vehicles (see application info to verify fitment with your vehicle). It comes with a dust cover to keep the connector socket clean when not in use.

Product Features:
  • Plugs into USCAR connection to add 4-way flat and retain use of existing socket
  • Simple plug-and-play design eliminates the need for cutting or splicing
  • 4-way flat output connects tail lights, brake lights and turn signals
  • Dust cover included to keep connector clean when not in use
  • Slit loom keeps wires contained and well protected
See More

Hopkins – Wiring Kit (Part No.40950)

Wiring Kit

from

$37.99
By incorporating Endurance design features that include oversized hinges, internal grommets for enhanced weather proofing and a lid that opens 180 degrees, this connector is guaranteed to last for years of trouble free use. Multi-Tow design feature adds multiple towing options from one connector by providing sockets for towing both 7 blade and 4 flat trailers. This connector is Plug-In Simple! with no cutting or splicing, saving you time by utilizing an OEM connector to create an exact fit for easy installation and maximum weatherproofing. Four hole mount installation for standard mounting brackets.

Product Features:
  • Endurance Professional Grade
  • Plug-In Simple! Wiring Kit
  • Utilizes OEM connectors create an exact fit and maximum weatherproofing
  • Multi-Tow provides multiple towing options from one connector
  • Weatherproof lid opens 180 degrees
  • Oversized hinge offers ultimate durability
  • Superior Ergonomics
  • For Use w/Factory Tow Package
  • Impact And Corrosion Resistant
See More

Most Popular Trailer Wiring Kits for 2021 Audi Q7s

Enhance your 2021 Audi Q7 with one of the 9 Trailer Wiring Kits we have in stock, starting at just $22.99.

Hopkins – Wiring Kit (Part No.40974)

Wiring Kit

from

$41.99
Tow more than one trailer? This exact OEM replacement Multi-Tow design features multiple towing options from one connector by providing sockets for towing both 7 blade and 4 flat trailers. This connector is Plug-In Simple! with no cutting or splicing, saving you time by utilizing an OEM connector to create an exact fit for easy installation and maximum weatherproofing.

Product Features:
  • Multi-Tow provides multiple towing options from one connector
  • Plug-In Simple! Wiring Kit
  • Utilizes OEM connectors create an exact fit and maximum weatherproofing
  • Impact and corrosion resistant
  • Pre-greased terminals for added protection
  • Includes Step-By-Step Instructions
See More

Hopkins – Wiring Kit (Part No.40950)

Wiring Kit

from

$37.99
By incorporating Endurance design features that include oversized hinges, internal grommets for enhanced weather proofing and a lid that opens 180 degrees, this connector is guaranteed to last for years of trouble free use. Multi-Tow design feature adds multiple towing options from one connector by providing sockets for towing both 7 blade and 4 flat trailers. This connector is Plug-In Simple! with no cutting or splicing, saving you time by utilizing an OEM connector to create an exact fit for easy installation and maximum weatherproofing. Four hole mount installation for standard mounting brackets.

Product Features:
  • Endurance Professional Grade
  • Plug-In Simple! Wiring Kit
  • Utilizes OEM connectors create an exact fit and maximum weatherproofing
  • Multi-Tow provides multiple towing options from one connector
  • Weatherproof lid opens 180 degrees
  • Oversized hinge offers ultimate durability
  • Superior Ergonomics
  • For Use w/Factory Tow Package
  • Impact And Corrosion Resistant
See More

CURT – Replacement USCAR Socket with 24in. Wires (Vehicle Side) (Part No.56229)

Replacement USCAR Socket with 24in. Wires (Vehicle Side)

from

$26.99
Like trailer hitches and ball mounts, electrical connectors range all over the board in shape, size and capability, but no matter what your trailer’s electrical functions are, you need a solid connection to keep the power flowing and ensure safety on the road. CURT electrical connectors are designed and manufactured to give you a reliable connection every time you plug in your trailer. This 7-way USCAR replacement harness is designed to replace an existing USCAR plug and supply power for tail lights, turn signals, electric trailer brakes, a battery, reverse lights and brake lights, as well as a ground connection. It features rust-free black plastic construction and comes with color-coded wires and 24″ of bonded wire for easy splicing into your vehicle’s wiring system. This 7-way USCAR connector is a female-end socket, specifically designed for the vehicle side of the connection.

Product Features:
  • Replaces damaged or missing USCAR vehicle harness
  • Includes 24″ color-coded, bonded wires for easy installation
See More

CURT – Replacement OE 4-Way Flat Socket (T s into USCAR) (Part No.55384)

Replacement OE 4-Way Flat Socket (T s into USCAR)

from

$38.99
Stress is the last thing you should feel when towing a trailer — whether you’re hauling your RV to that favorite camping destination, your ATVs up to the hunting grounds or your fishing boat to the new hidden hotspot. At CURT, we think your towing equipment should add to the enjoyment of your experience, not detract from it. CURT custom wiring connectors are the easiest way to outfit your vehicle with a CURT trailer wiring connection. They are built with some of the most advanced technology in the industry, and each one is custom-fitted to work with a specific make and model. Some automotive manufacturers install a special socket on the vehicle to be used for vehicle-to-trailer wiring. Though this special socket is not equipped on every vehicle, a CURT custom wiring connector (also called a T-connector) utilizes the socket for simple, stress-free installation. Rather than requiring you to cut, splice and solder into your vehicle’s wiring system, the custom wiring connector uses a single OEM-compatible plug and instantly provides a standard vehicle-to-trailer wiring connection, typically in the form a 4-way flat. All CURT custom wiring connectors are made vehicle-specific for the easiest possible installation and the best fit. This particular connector provides a 4-way flat socket while retaining use of the existing OEM socket. It is designed to be a custom wiring option for a variety of vehicles (see application info to verify fitment with your vehicle). It comes with a dust cover to keep the connector socket clean when not in use.

Product Features:
  • Plugs into USCAR connection to add 4-way flat and retain use of existing socket
  • Simple plug-and-play design eliminates the need for cutting or splicing
  • 4-way flat output connects tail lights, brake lights and turn signals
  • Dust cover included to keep connector clean when not in use
  • Slit loom keeps wires contained and well protected
See More

CURT – Replacement OE 4-Way Flat Socket (Plugs into USCAR) (Part No.55515)

Replacement OE 4-Way Flat Socket (Plugs into USCAR)

from

$32.99
A CURT custom wiring connector (sometimes called a T-connector) is a simple, plug-and-play electrical device that eliminates the need for cutting, splicing and soldering when installing vehicle-to-trailer wiring. Most vehicles do not come ready to tow. Unless your vehicle has a towing package, it is probably not equipped with a trailer wiring connector. This is where CURT’s custom wiring connectors come into play. A custom wiring connector uses a single original equipment plug to plug into a special socket provided by your vehicle. Though this option is not available on every vehicle, some automotive manufacturers design their vehicles to be easily equipped for towing by supplying a socket, integrated into the vehicle’s electrical system, to readily accept a custom wiring connector. With a CURT custom wiring connector, there is no need to tap into the taillight assembly because a special socket is already provided. This custom wiring connector provides a 4-way flat connector socket and is designed to be a custom wiring option for a variety of vehicles (see application info to verify fitment with your vehicle). CURT custom wiring connectors are designed to be long-lasting and simple to install. They come with dust covers to keep your connector clean when not in use.

Product Features:
  • Plugs into USCAR socket to provide 4-way flat trailer wiring connector
  • Simple plug-and-play design eliminates the need for cutting or splicing
  • 4-way flat output connects tail lights, brake lights and turn signals
  • Dust cover included to keep connector clean when not in use
  • Slit loom keeps wires contained and well protected
  • Backed by a limited one-year warranty
See More

CURT – Replacement OE 7-Way RV Blade Socket (Plugs into USCAR) (Part No.55415)

Replacement OE 7-Way RV Blade Socket (Plugs into USCAR)

from

$22.99
Like trailer hitches and ball mounts, electrical connectors range all over the board in shape, size and capability, but no matter what your trailer’s electrical functions are, you need a solid connection to keep the power flowing and ensure safety on the road. CURT electrical connectors are designed and manufactured to give you a reliable connection every time you plug in your trailer. This 7-way RV blade connector is designed to plug into a USCAR socket and supply power for tail lights, turn signals, electric trailer brakes, a 12-volt battery, reverse lights and brake lights, as well as a ground connection. It is intended to be a replacement trailer connector, plugging into a standard USCAR socket (see application info to verify fitment with your vehicle). It features rust-free black plastic construction and comes with a spring-loaded cover to keep out dust and water. This 7-way RV blade connector is a female-end socket, specifically designed for the vehicle side of the connection.

Product Features:
  • Plugs into USCAR socket to provide 7-way RV blade trailer wiring connector
  • Simple plug-and-play design eliminates the need for cutting or splicing
  • 7-way connects tail, brake, reverse, turn signals, brakes and auxiliary power
  • Spring-loaded dust cover keeps connector clean when not in use
See More

CURT – Replacement OE 7-Way RV Blade Socket (Twists into USCAR) (Part No.56415)

Replacement OE 7-Way RV Blade Socket (Twists into USCAR)

from

$25.99
Like trailer hitches and ball mounts, electrical connectors range all over the board in shape, size and capability, but no matter what your trailer’s electrical functions are, you need a solid connection to keep the power flowing and ensure safety on the road. CURT electrical connectors are designed and manufactured to give you a reliable connection every time you plug in your trailer. This 7-way OEM USCAR replacement connector is designed to plug into a twist-in OEM vehicle socket and supply power for tail lights, turn signals, electric trailer brakes, a 12-volt battery, reverse lights and brake lights, as well as a ground connection. It features rust-free black plastic construction and comes with a spring-loaded cover to keep out dust and water. This 7-way RV blade connector is a female-end socket, specifically designed for the vehicle side of the connection (see application info to verify fitment with your vehicle).

Product Features:
  • Plugs into USCAR socket to provide 7-way RV blade trailer wiring connector
  • Twist-in, plug-and-play design eliminates the need for cutting or splicing
  • 7-way connects tail, brake, reverse, turn signals, brakes and auxiliary power
  • Spring-loaded dust cover keeps connector clean when not in use
See More

CURT – Multi-Function Taillight Converter (Part No.56236)

Multi-Function Taillight Converter

from

$104.99
Rain, road grime and salt can deal a vicious blow to your trailer wiring, and it takes electrical components with an extra-thick shell to stand up to the elements. The CURT multi-function electrical converter is an advanced taillight converter that offers the ultimate in vehicle compatibility and weather resistance, giving you a reliable wiring connection any season of the year. The potted design seals the internal electrical components in a watertight enclosure and is filled with a solid compound to protect against impacts, vibrations and moisture for long-lasting use, even on the exterior of the vehicle. The converter also features our advanced surface mount technology (SMT), using smaller components mounted directly to the surface of the circuit board. This produces lower resistance, reduced heat generation, longer life cycles and higher reliability. The CURT multi-function electrical converter comes with pigtail wires that are able to be spliced into two-wire, three-wire or PWM wiring system with combined stop and taillights. It converts any of these systems to a simple two-wire system, using a standard 4-way flat output, to be compatible with most trailer wiring. The converter is controlled using a microcontroller that is able to sense the current passing through it, allowing for quick reaction to dangerous conditions such as overload and short circuits. It also filters unwanted input signals to protect your wiring systems and uses a mere seven volts for low-voltage operation. The CURT multi-function taillight converter is a heavy-duty electrical converter for virtually any vehicle-trailer combination. It comes with color-coded wires and an easy-to-read wiring guide, as well as a dust cover to protect the 4-way flat connector. This package also includes four snap locks for faster, more secure splicing. A powered converter wiring kit #55152 is also required for installation.

Product Features:
  • Converts 2-wire, 3-wire or PWM ST system to 2-wire trailer light wiring
  • Potted enclosure significantly increases water and vibration resistance
  • 4-way flat output connects tail lights, brake lights and turn signals
  • Constructed with SMT circuitry for better performance and durability
  • Microcontroller senses current to rapidly react to overload
  • Provides improved overload, short-circuit and thermal protection
  • Low-voltage operation allows function down to seven volts
  • Color-coded wires with wiring guide for easier installation
  • Snap locks included for fast, secure splicing
  • Dust cover included to keep connector clean when not in use
See More

CURT – Oem Replacement Dual-Output 7 & 4-Way Connector (Plugs Into Uscar) (Part No.57020)

Oem Replacement Dual-Output 7 & 4-Way Connector (Plugs Into Uscar)

from

$34.99
CURT electrical connectors are designed to give you a reliable connection every time you plug in your trailer. This dual-output connector is designed to be a perfect OEM replacement, plugging into a USCAR socket and supplying power for tail lights, turn signals, electric trailer brakes, a 12-volt battery, reverse lights and brake lights, as well as a ground connection. It is intended to be a replacement trailer connector, plugging into a standard USCAR socket and providing a 4-way flat and 7-way RV blade socket (see application info to verify fitment with your vehicle). It features rust-free black plastic construction and comes with spring-loaded covers to keep out dust and water.

Product Features:
  • Plugs into USCAR socket to provide 4-way and 7-way trailer wiring connectors
  • Fits USCAR-equipped vehicles with factory tow plugs only
  • Simple plug-and-play design eliminates the need for cutting or splicing
  • Easy, snap-in installation
  • 4-way flat output connects tail lights, brake lights and turn signals
  • 7-way RV blade socket adds reverse lights, electric brakes and auxiliary power
  • Rubber gasket to keep moisture and elements out
  • Spring-loaded dust covers keep connectors clean when not in use
See More

Best-Selling 2021 Audi Q7 Trailer Wiring Harness

Upgrade your Q7 with one of our 3 best-selling Trailer Wiring Harness, earning an average 4 stars rating across 20 reviews.

Hopkins – Wiring Kit (Part No.40955)

Wiring Kit

from

$42.99
Tow more than one trailer? Multi-Tow design feature adds multiple towing options from one connector by providing sockets for towing both 7 blade and 4 flat trailers. This connector is Plug-In Simple! with no cutting or splicing, saving you time by utilizing an OEM connector to create an exact fit for easy installation and maximum weatherproofing.

Product Features:
  • Multi-Tow provides multiple towing options from one connector
  • Plug-In Simple! Wiring Kit
  • Utilizes OEM connectors create an exact fit and maximum weatherproofing
  • Includes mounting bracket and hardware
  • Impact and corrosion resistant
  • Fits in standard 7 blade bracket
  • Includes Step-By-Step Instructions
See More

CURT – Dual-Output 7/4-Way Connector (Plugs into USCAR) (Part No.55774)

Dual-Output 7/4-Way Connector (Plugs into USCAR)

from

$36.99
A CURT custom wiring connector (sometimes called a T-connector) is a simple, plug-and-play electrical device that eliminates the need for cutting, splicing and soldering when installing vehicle-to-trailer wiring. Most vehicles do not come ready to tow. Unless your vehicle has a towing package, it is probably not equipped with a trailer wiring connector. This is where CURT’s custom wiring connectors come into play. A custom wiring connector uses a single original equipment plug to plug into a special socket provided by your vehicle. Though this option is not available on every vehicle, some automotive manufacturers design their vehicles to be easily equipped for towing by supplying a socket, integrated into the vehicle’s electrical system, to readily accept a custom wiring connector. With a CURT custom wiring connector, there is no need to tap into the taillight assembly because a special socket is already provided. This special custom wiring connector actually provides two connector sockets for a multipurpose option. It plugs into an OEM connector and offers a 4-way flat and 7-way RV blade connector. It comes with a mounting bracket for easy installation and is designed to be a custom wiring option for a variety of vehicles (see application info to verify fitment). CURT custom wiring connectors are designed to be long-lasting and simple to install. They come with dust covers to keep your connector clean when not in use.

Product Features:
  • Plugs into USCAR socket to provide 4-way and 7-way trailer wiring connectors
  • Fits USCAR-equipped vehicles with factory tow plugs only
  • Simple plug-and-play design eliminates the need for cutting or splicing
  • 4-way flat output connects tail lights, brake lights and turn signals
  • 7-way RV blade socket adds reverse lights, electric brakes and auxiliary power
  • Dust covers included to keep connectors clean when not in use
  • Slit loom keeps wires contained and well protected
  • Metal bracket securely mounts wiring to the vehicle or trailer hitch
See More

Hopkins – Wiring Kit (Part No.41155)

Wiring Kit

from

$25.99
Dont splice onto your vehicles factory wiring harness. Simply plug in this Hopkins? vehicle wiring kit featuring exact OEM matching connectors for a perfect weather-tight fit. This kit includes the accessories needed to get you towing faster.

Product Features:
  • Plug-In Simple? Wiring Kit
  • Utilizes OEM Connectors For Enhanced Fit And Weatherproofing
  • Includes Vehicle Side 4 Flat
  • Corrosion Resistant Terminals
  • Impact And Corrosion Resistant
  • Includes Dust Cover And Grease Packet To Prevent Corrosion
  • Includes Step-By-Step Instructions
See More

Top-Rated Trailer Wiring Brands For Your 2021 Audi Q7

When it comes to finding the perfect Trailer Wiring for your 2021 Audi Q7, Advance Auto Parts has you covered with a wide selection of high-quality OEM and aftermarket options from 2 trusted brands. We carry the most popular Trailer Wiring brands including Hopkins, and more, all known for their exceptional customer ratings (average brand rating of 4.3 stars) and competitive prices, as low as $41.99. Purchasing a Trailer Wiring from us here at Advance Auto Parts is a smart move for both you and your 2021 Audi Q7, providing peace of mind with parts that meet or exceed OEM standards.

Popular Hopkins 2021 Audi Q7 Trailer Wirings

If you’re looking for a top-quality Trailer Wiring for your 2021 Audi Q7, Advance Auto Parts has exactly what you need with our selection of Hopkins Trailer Wirings. We have 2 Hopkins Trailer Wirings in stock for this fitment, all known for their durability and precision fit. With prices starting at just $41.99 and an average cost of $42.49, you’ll find the perfect Trailer Wiring for your needs and budget. Hopkins Trailer Wirings for the 2021 Audi Q7 come highly rated, with over 37 customer reviews and an impressive average rating of 4.3 stars. Choosing a Hopkins Trailer Wiring from Advance Auto Parts is a smart move to ensure quality and value for your vehicle.
Wiring Kit
from $41.99
(17)
Wiring Kit
“Super easy to replace the receptical that was in my bumper and not working correctly. This solved my problems. Since I tow RVs, boats, and other trail”
Wiring Kit
from $42.99
(20)
Wiring Kit
“the vehicle wire kit was a good fit ..and a good price”

FAQs for 2021 Audi Q7 Trailer Wirings

What are the best-selling Trailer Wirings for 2021 Audi Q7s?

Out of 12 Trailer Wirings that fit 2021 Audi Q7s, the following parts are the top sellers:

What’s the price range for 2021 Audi Q7 Trailer Wiring?

The prices of Trailer Wiring for the 2021 Audi Q7 range from $22.99 up to $104.99 for the most premium parts.

What is the average price of a Trailer Wiring for a 2021 Audi Q7?

The average price for Trailer Wirings for the 2021 Audi Q7 is $39.49. Keep in mind the variety of part types within our Trailer Wiring category, where you are likely to find a wide range of prices across a variety of parts and components.

Does Advance Auto Parts sell Trailer Wiring for other Audi Q7 model years?

Yes, we carry Trailer Wiring for 15 model years of Audi Q7s between 2007 and 2024. The following model years are the most popular for Trailer Wiring purchases: 2022, 2020, 2018, 2017, 2015, 2014, 2013, 2012, and 2011.

What are the cheapest Trailer Wiring for my 2021 Audi Q7?

The cheapest 2021 Audi Q7 Trailer Wiring we carry are:

What are the top-rated Trailer Wiring that fit the 2021 Audi Q7?

Based on 195 reviews by customers, our 2021 Audi Q7 Trailer Wiring have an average customer rating of 3 stars. These are the highest-rated categories of Trailer Wiring for the 2021 Audi Q7 and their top-rated products:

What types of Trailer Wiring do you sell for my 2021 Audi Q7?

As of 3/1/26, these are some of the most in-demand types of Trailer Wiring for a 2021 Audi Q7:

Can I get help with 2021 Audi Q7 Trailer Wiring orders?

Contact our customer support team by chat or phone, through the help desk page, where you can find instant answers about Audi Trailer Wiring and more.

What is your return policy for Audi Q7 Trailer Wiring?

Advance Auto Parts keeps returns simple. For new Audi Q7 Trailer Wiring and accessories, your online orders can be returned, in their original condition, within 45 days. For requirements, see the returns page.