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Fit and Installation of T-One 4-Pole Wiring Harness 118494 on 2013 GMC Terrain  

Question:

I want to know if part number 118494 will fit my 2013 terrain

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Expert Reply:

The T-One 4-Pole Wiring Harness Kit # 118494 is a confirmed fit for your 2013 GMC Terrain. This harness fits the 2010 through 2017 Terrain and also the same years of the Chevy Equinox. This harness will deliver stop, turn and tail light signals to a trailer or other 4-pole-equipped device, such as a lighted hitch cover like # CR-007G.

Installation consists of plugging in the connectors at the vehicle tail lights, attaching a ground wire and running one single wire up to the engine compartment to connect to the battery using the included fuse holder.

Written instructions and an installation video showing your same vehicle are linked to help you. I also included an article with tips for easier routing of the one wire that goes up to the battery.

I recommend using dielectric grease # 11755 on all connectors (and the fuse holder too) to block moisture that could over time lead to corrosion and connectivity issues.

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