GMC Terrain Trailer Wiring

Your One-Stop Shop For Trusted GMC Terrain Trailer Wiring

If you’re in search of GMC Terrain Trailer Wiring aftermarket or OEM parts, consider your search over! Advance Auto Parts carries 12 Trailer Wiring from top brands with prices ranging from $22.99 to $71.99.

Beyond great prices, we stock trusted brands manufacturing all types of Trailer Wiring for your GMC Terrain.

And don’t forget to read customer reviews across all Trailer Wiring categories in our catalog. Buy with confidence by leveraging past customer experiences of our aftermarket and OEM parts.

At Advance Auto Parts, we don’t think top quality Trailer Wiring have to cost top dollar, and we prove it. Browse our top GMC Terrain Trailer Wiring below, order online to ship to your home, or head into your nearest Advance Auto Parts location to get started.

Please Select your Vehicle to See Exact Fit Parts

Essential GMC Terrain Trailer Wiring

GM Genuine Parts – GM Genuine Parts Multi-Purpose Relay, 15-81106 (Part No.15-81106)

GM Genuine Parts Multi-Purpose Relay, 15-81106

from

$41.49
GM Genuine Parts Wiring Relays are designed, engineered, and tested to rigorous standards, and are backed by General Motors. These relays help connect or disconnect power to a vehicle accessory when it receives a low voltage signal from a switch. GM Genuine Parts are the true OE parts installed during the production of or validated by General Motors for GM vehicles. Some GM Genuine Parts may have formerly appeared as ACDelco GM Original Equipment (OE).
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CURT – CURT Custom Wiring Harness (5-Way Flat Output), 56594 (Part No.56594)

CURT Custom Wiring Harness (5-Way Flat Output), 56594

from

$71.99
A CURT custom wiring harness (also 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 harnesses come into play. Custom wiring harnesses plug into your vehicle’s electrical system using original equipment (OEM) connectors. Our custom wiring harnesses use two or more OEM connectors to plug in at the taillight assembly and provide a standard trailer socket to allow a trailer to be plugged into your vehicle’s power system. This harness provides a 5-way flat connector socket and is designed to be a custom wiring harness for certain years of the GMC Terrain or Chevrolet Equinox (to verify your vehicle compatibility, see the CURT application guide at curtmfg.com). CURT custom wiring harnesses are long-lasting and quick to install. They come with dust covers to keep your connector clean when not in use and feature a one-year limited warranty to give you peace of mind.
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CURT – CURT Replacement USCAR Socket with 24in. Wires (Vehicle Side), 56229 (Part No.56229)

CURT Replacement USCAR Socket with 24in. Wires (Vehicle Side), 56229

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.”
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Carquest Premium – Carquest Trailer Connector Kit, TCC1255 (Part No.TCC1255)

Carquest Trailer Connector Kit, TCC1255

from

$62.99
Modern vehicles may have 100 or more electrical harness connectors in every operating system of the vehicle. Terminal tension may weaken with time or corrosion may occur within the connector housing making replacement necessary. When replacing any harness-connector assembly approved wire termination methods must be followed to ensure a successful and long-term solution to the original problem is made. A failed terminal connection, terminal corrosion or damaged wire will result in an electrical system fault.
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CURT – CURT Custom Wiring Connector (4-Way Flat Output OEM Tow Package Required), 56375 (Part No.56375)

CURT Custom Wiring Connector (4-Way Flat Output OEM Tow Package Required), 56375

from

$36.99
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. Although 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, universal 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 plug-in connector provides a 4-way flat socket and is designed to be a custom wiring option for certain years of the Chevy Equinox (factory tow package required; to verify your vehicle compatibility, see application info). It comes with all necessary hardware to establish a solid connection. It also comes with a dust cover to keep the connector socket clean when not in use. To ensure long-lasting reliability, all CURT custom wiring connectors are thoroughly tested for optimal functionality. 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.
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CURT – CURT Custom Wiring Connector (4-Way Flat Output OEM Tow Package Required), 56427 (Part No.56427)

CURT Custom Wiring Connector (4-Way Flat Output OEM Tow Package Required), 56427

from

$30.49
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. Although 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, universal 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 plug-in connector provides a 4-way flat socket and is designed to be a custom wiring option for certain years of the Cadillac XT4 (factory tow package required; to verify your vehicle compatibility, see application info). It comes with all necessary hardware to establish a solid connection. It also comes with a dust cover to keep the connector socket clean when not in use. To ensure long-lasting reliability, all CURT custom wiring connectors are thoroughly tested for optimal functionality. 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.
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CURT – CURT Replacement OE 4-Way Flat Socket (T s into USCAR), 55384 (Part No.55384)

CURT Replacement OE 4-Way Flat Socket (T s into USCAR), 55384

from

$41.99
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.
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CURT – CURT Replacement OE 7-Way RV Blade Socket (Plugs into USCAR), 55415 (Part No.55415)

CURT Replacement OE 7-Way RV Blade Socket (Plugs into USCAR), 55415

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.
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CURT – CURT Heavy-Duty Replacement OE 7-Way RV Blade Socket (Plugs into USCAR), 55416 (Part No.55416)

CURT Heavy-Duty Replacement OE 7-Way RV Blade Socket (Plugs into USCAR), 55416

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 wiring 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 (see application info to verify fitment with your vehicle).
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CURT – CURT Custom 4-Flat, Select Chevrolet Equinox, GMC Terrain, OEM Tow Package Required, 56210 (Part No.56210)

CURT Custom 4-Flat, Select Chevrolet Equinox, GMC Terrain, OEM Tow Package Required, 56210

from

$25.99
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. Although 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, universal 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 plug-in connector provides a 4-way flat socket and is designed to be a custom wiring option for certain years of the Chevy Equinox and GMC Terrain (factory tow package required; to verify your vehicle compatibility, see application info). It comes with all necessary hardware to establish a solid connection. It also comes with a dust cover to keep the connector socket clean when not in use. To ensure long-lasting reliability, all CURT custom wiring connectors are thoroughly tested for optimal functionality. 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.
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CURT – CURT Dual-Output 7/4-Way Connector (Plugs into USCAR), 55774 (Part No.55774)

CURT Dual-Output 7/4-Way Connector (Plugs into USCAR), 55774

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.
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CURT – CURT Dual-Output 6/4-Way Connector (Plugs into USCAR), 55664 (Part No.55664)

CURT Dual-Output 6/4-Way Connector (Plugs into USCAR), 55664

from

$49.99
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 USCAR connector and offers a 4-way flat and 6-way round connector (see application info to verify fitment with your vehicle). It also comes with a mounting bracket for easy installation. 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.
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Trailer Wiring Brands You Can Trust For Your GMC Terrain

3 trusted brands of Trailer Wiring line our shelves, ready to help keep your GMC Terrain running smooth. Below are some of the most popular brands and their top Trailer Wiring offerings:

Most Purchased GMC Terrain Trailer Wiring from GM Genuine Parts

When you buy the most frequently purchased GM Genuine Parts brand Trailer Wiring, you can be confident it will be the right part for your GMC Terrain. Here are the GM Genuine Parts Trailer Wiring Advanced Auto customers buy the most:
GM Genuine Parts Multi-Purpose Relay, 15-81106
from $41.49
This product is not rated
GM Genuine Parts Multi-Purpose Relay, 15-81106
Trailer Marker Light Switch Relay
CURT Dual-Output 7/4-Way Connector (Plugs into USCAR), 55774
from $36.99
This product is not rated
CURT Dual-Output 7/4-Way Connector (Plugs into USCAR), 55774
Trailer Wiring Harness
CURT Replacement OE 4-Way Flat Socket (T s into USCAR), 55384
from $41.99
This product is not rated
CURT Replacement OE 4-Way Flat Socket (T s into USCAR), 55384
Trailer Wiring Kits

FAQs for GMC Terrain Trailer Wiring

What are the most purchased Trailer Wiring for the GMC Terrain?

Out of 12 Trailer Wiring for the GMC Terrain, the most popular in our inventory are:
GM Genuine Parts Multi-Purpose Relay, 15-81106
from $41.49
This product is not rated
GM Genuine Parts Multi-Purpose Relay, 15-81106
Trailer Marker Light Switch Relay
CURT Dual-Output 7/4-Way Connector (Plugs into USCAR), 55774
from $36.99
This product is not rated
CURT Dual-Output 7/4-Way Connector (Plugs into USCAR), 55774
Trailer Wiring Harness
CURT Replacement USCAR Socket with 24in. Wires (Vehicle Side), 56229
from $26.99
This product is not rated
CURT Replacement USCAR Socket with 24in. Wires (Vehicle Side), 56229
Trailer Wiring Kits