2012 GMC Terrain Trailer Wiring

Keep Your 2012 GMC Terrain 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 2012 GMC Terrain looking sharp and performing at its best. At Advance Auto Parts we carry a wide selection of dependable options, including Trailer Wiring Kits. 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.

Competitive Prices and Extensive Inventory

The average price for a 2012 GMC Terrain Trailer Wiring at Advance Auto Parts is around $79.99, with a range that starts at $66.99 and goes up to $92.99. With 2 options in stock from one trusted brand, finding the right fit is easy. Popular picks like Custom Wiring Harness (5-Way Flat Output) and Custom Towed-Vehicle RV Wiring Harness start at just $66.99 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 2012 GMC Terrain in peak condition, inside and out.

Essential 2012 GMC Terrain Trailer Wiring

CURT – Custom Towed-Vehicle RV Wiring Harness (Part No.58900)

Custom Towed-Vehicle RV Wiring Harness

from

$92.99
Towing your vehicle behind your RV is a great way to experience more of the adventure on your cross-country excursions. Whether you’re towing a compact car or a full-size truck, CURT has the perfect solution to help you Bring It! CURT towed-vehicle RV harnesses are a vehicle-specific, plug-and-play solution to wiring your vehicle for dinghy towing. They use original-equipment-compatible connectors to plug into your vehicle’s wiring system without any cutting, splicing or soldering required. They provide a standard 4-way flat connector to plug into the RV socket and synchronize the vehicle’s tail lights, turn signals and brake lights with the RV’s. Because each towed-vehicle RV harness has a vehicle-specific design, installation is fast and easy. This particular RV dinghy towing wiring harness is designed for specific years of the Chevrolet Equinox and GMC Terrain. CURT RV harnesses are also built to provide long-lasting operation. They feature integrated block diodes that protect the vehicle’s circuits from the RV signals. They isolate the sensitive vehicle electronics, keeping them from overheating and short circuiting. Every CURT towed-vehicle RV harness comes ready to install with all necessary hardware included. They also come with a 4-way flat extension to provide plenty of length to plug into the RV socket, as well as a connector mounting bracket to mount the connector on the vehicle.

Product Features:
  • Connects a towed vehicle to an RV using a standard 4-way flat trailer plug
  • Simple plug-and-play design eliminates the need for cutting or splicing
  • Integrated block diodes isolate sensitive vehicle electronics from RV signals
  • Uses towed vehicle’s existing taillights, brake lights and turn signals
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Hopkins – 40920, Endurance Multi Tow« GM Twist Mount 7 Blade and 4 Flat Towing Connector (Part No.40920)

40920, Endurance Multi Tow« GM Twist Mount 7 Blade and 4 Flat Towing Connector

from

$35.99
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. Easy twist-mount installation requires no tools.

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

Hopkins – 40930, Endurance GM Twist Mount 7 Blade Towing Connector (Part No.40930)

40930, Endurance GM Twist Mount 7 Blade Towing Connector

from

$23.99
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. 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. Easy twist-mount installation requires no tools.

Product Features:
  • Endurance Professional Grade
  • Plug-In Simple!® Wiring Kit
  • Utilizes OEM connectors create an exact fit and maximum weatherproofing
  • Corrosion resistant terminals
  • Weatherproof lid opens 180 degrees
  • Oversized hinge offers ultimate durability
  • Superior Ergonomics
See More

CURT – Custom Wiring Harness (5-Way Flat Output) (Part No.56594)

Custom Wiring Harness (5-Way Flat Output)

from

$66.99
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.

Product Features:
  • Plugs into vehicle tail light assembly to provide a 5-way flat socket
  • Simple plug-and-play design eliminates the need for cutting or splicing
  • 5-way flat connects tail lights, brake lights, turn signals and reverse lights
  • Dust cover included to keep connector clean when not in use
See More

Hopkins – 40974, Multi-Tow® Exact Fit OEM replacement 7 Blade and 4 Flat Towing Connector (Part No.40974)

40974, Multi-Tow® Exact Fit OEM replacement 7 Blade and 4 Flat Towing Connector

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

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

Trailer Connector Kit

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.

Product Features:
  • Carquest electrical connectors meet or exceed OE wire gauge, insulation, and terminal material requirements.
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Hopkins – 40950, Endurance Multi Tow« Ford / GM 7 Blade and 4 Flat Towing Connector (Part No.40950)

40950, Endurance Multi Tow« Ford / GM 7 Blade and 4 Flat Towing Connector

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 2012 GMC Terrains

Enhance your 2012 GMC Terrain with one of the 2 Trailer Wiring Kits we have in stock, starting at just $66.99.

CURT – Custom Towed-Vehicle RV Wiring Harness (Part No.58900)

Custom Towed-Vehicle RV Wiring Harness

from

$92.99
Towing your vehicle behind your RV is a great way to experience more of the adventure on your cross-country excursions. Whether you’re towing a compact car or a full-size truck, CURT has the perfect solution to help you Bring It! CURT towed-vehicle RV harnesses are a vehicle-specific, plug-and-play solution to wiring your vehicle for dinghy towing. They use original-equipment-compatible connectors to plug into your vehicle’s wiring system without any cutting, splicing or soldering required. They provide a standard 4-way flat connector to plug into the RV socket and synchronize the vehicle’s tail lights, turn signals and brake lights with the RV’s. Because each towed-vehicle RV harness has a vehicle-specific design, installation is fast and easy. This particular RV dinghy towing wiring harness is designed for specific years of the Chevrolet Equinox and GMC Terrain. CURT RV harnesses are also built to provide long-lasting operation. They feature integrated block diodes that protect the vehicle’s circuits from the RV signals. They isolate the sensitive vehicle electronics, keeping them from overheating and short circuiting. Every CURT towed-vehicle RV harness comes ready to install with all necessary hardware included. They also come with a 4-way flat extension to provide plenty of length to plug into the RV socket, as well as a connector mounting bracket to mount the connector on the vehicle.

Product Features:
  • Connects a towed vehicle to an RV using a standard 4-way flat trailer plug
  • Simple plug-and-play design eliminates the need for cutting or splicing
  • Integrated block diodes isolate sensitive vehicle electronics from RV signals
  • Uses towed vehicle’s existing taillights, brake lights and turn signals
See More

CURT – Custom Wiring Harness (5-Way Flat Output) (Part No.56594)

Custom Wiring Harness (5-Way Flat Output)

from

$66.99
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.

Product Features:
  • Plugs into vehicle tail light assembly to provide a 5-way flat socket
  • Simple plug-and-play design eliminates the need for cutting or splicing
  • 5-way flat connects tail lights, brake lights, turn signals and reverse lights
  • Dust cover included to keep connector clean when not in use
See More

FAQs for 2012 GMC Terrain Trailer Wirings

What are the best-selling Trailer Wirings for 2012 GMC Terrains?

Out of 2 Trailer Wirings that fit 2012 GMC Terrains, the following parts are the top sellers:

What’s the price range for 2012 GMC Terrain Trailer Wiring?

The prices of Trailer Wiring for the 2012 GMC Terrain range from $66.99 up to $92.99 for the most premium parts.

What is the average price of a Trailer Wiring for a 2012 GMC Terrain?

The average price for Trailer Wirings for the 2012 GMC Terrain is $79.99. 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 GMC Terrain model years?

Yes, we carry Trailer Wiring for 13 model years of GMC Terrains between 2010 and 2024. The following model years are the most popular for Trailer Wiring purchases: 2023, 2022, 2021, 2020, 2019, 2018, 2017, 2016, and 2015.

What are the cheapest Trailer Wiring for my 2012 GMC Terrain?

The cheapest 2012 GMC Terrain Trailer Wiring we carry are:

Does Advance Auto Parts sell Trailer Wiring for any other 2012 GMC models?

Yes. We stock Trailer Wiring for 11 other popular 2012 GMC models. Some of the most popular are 2012 Yukon Trailer Wiring, 2012 Sierra 1500 Trailer Wiring, 2012 Yukon XL 1500 Trailer Wiring, 2012 Sierra 2500 HD Trailer Wiring, and 2012 Yukon XL 2500 Trailer Wiring.

What types of Trailer Wiring do you sell for my 2012 GMC Terrain?

We currently have just 1 Trailer Wiring in stock for a 2012 GMC Terrain, and as of 11/2/25, it is a Trailer Wiring Kit.

Can I get help with 2012 GMC Terrain Trailer Wiring orders?

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

What is your return policy for GMC Terrain Trailer Wiring?

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