Troubleshotting Curt Trailer Wiring Harness Not Fitting 2012 GMC Terrain
Updated 09/26/2025 | Published 04/28/2025
Products Featured in This Question
Question:
I just installed my new trailer hitch and wiring harness. The hitch fit perfect as did the harness. My question is regarding the trailer light harness. I plugged it in as described but it doesnt work. This lead me to check fuses that are good. Am I missing something? Is there a master fuse? Since it didnt come with a hitch Im assuming the vehicle doesnt have a tow package but the wire harness in the back is in place. Can you help? Thanks Ed
asked by: Edmond K
Expert Reply:
Hey Edmond, the Curt trailer wiring kit part # C56210 that you have for your 2012 GMC Terrain would only fit if you have the factory tow package which it sounds like yours doesn't. What we know is that there are some OEM components needed to activate the tow package wiring that we unfortunately do not have access to. That said, what we can guarantee will work is the # 56094 which installs by plugging inline with the vehicle taillights. This is the for sure kit we can recommend that will work.
Product Page this Question was Asked From
Curt T-Connector Vehicle Wiring Harness for Factory Tow Package - 4-Pole Flat Trailer Connector
- Custom Fit Vehicle Wiring
- Trailer Hitch Wiring
- Vehicle End Connector
- No Converter
- Factory Tow Package
- 4 Flat
- Plug and Lead
- Plug-In
- Visible
- CURT
more information >
Featured Help Information
Instructions
Continue Researching
- Q&A: How to Tell if 2015 Chevrolet Equinox Has Factory Tow Package
- Article: Brake Controller 7- and 4-Way Installation Kit (ETBC7)
- Q&A: Curt Vs. Draw-Tite Trailer Hitch for a 2017 Chevrolet Equinox
- Q&A: Underbed Gooseneck Hitch For 2020 Ford F-150 Short Bed
- Q&A: How To Install a Brake Controller On a 2015 Chevrolet Equinox
- Article: Trailer Wiring Diagrams
- Q&A: Availability of EcoHitch Front Hitch Installation Video With Active Air Dam Removal for 2024 F-150
- Q&A: What Color Trailer Wires go to the Red, Black and White Taillight Wires
- Q&A: Why Would Trailer Hitch Install Hardware Seem Like it's Too Big to Fit
- Article: Stability Control for Heavy Duty Vehicles
- Article: Gooseneck to 5th Wheel Adapters
- Article: How to Clean Weld Nuts for the Installation of a Trailer Hitch | etrailer.com
- Article: What are the Common Types of Propane Fittings Used on RVs?
- Article: Is It Illegal to Leave My Hitch on My Truck?
Jameson C.
9/26/2025
Hey Ed, did you get a chance to try the Curt wiring kit that plugs inline with the taillights? I'm curious to know if it solved the issue for you, as it could help others facing a similar situation.