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Trailer Wiring Harness Installation - 2012 Chevrolet Traverse

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How to Install a Trailer Wiring Harness on a 2012 Chevrolet Traverse


Today on our 2012 Chevrolet Traverse were going to be installing the Tow-Ready T1 Connector part number 118450. To begin our installation, well first open up the rear access door and well need to remove the driver side taillight assembly. To do that, well take a small a flat bladed screw driver here and remove the fastener covers. Now we can go ahead and remove the two fasteners securing the taillight housing. As you remove the housing, be careful not to break the alignment tab. Now with the taillight assembly removed, we can see the alignment tab you need to be careful not to break off as we remove the assembly.

As you can see, the taillight wiring runs into the taillight assembly here; to disconnect the manufacturers wire, well simply press on the connector lock and separate the two connectors. Now we can go ahead and set the taillight assembly aside. With the driver side removed, we can now go ahead and take the new T1 harness with the yellow and brown connector and plug in line with the manufacturers wiring on the driver side. Next, well go ahead and take the green wire connector and feed it down between the body fascia and the sheet metal of the body so that we can access it underneath the vehicle. Well repeat the same process with our 4-pole connector.

Next, well take the white wire with the preformed ring terminal and our self-tapping screw and make our ground connection here behind the driver side taillight assembly. With that done, we can now go ahead and make connection with the taillight assembly and reinstall it. Next, Ill move over to the passenger side and remove the taillight assembly just as we did on the driver side. With that done, I will now go ahead and get underneath the vehicle and start routing our wires. For this application, well go ahead and remove the two pushpin fasteners securing some of the underbody trim panels so we can tuck our wire up and underneath safely securing it.

Now with our fasteners removed, lets go ahead and start routing our wires. As you route your wires, you need to be mindful of excessive heat such as exhaust or moving components such as steering or suspension. The 4-pole connector will come out from underneath the bumper fascia here towards the center so that it can be routed over the hitch while our green wire will get tucked up underneath the underbody trim panel or fascia and be routed all the way over to the passenger side. Once over here, Im going to go ahead and add a pull wire or wire leader using a piece of air tubing or wire to route it up behind the passenger side taillight assembly just as we fed it down on the driver side behind that assembly. Now with our wire in place, well go ahead and go back and secure the 4-pole to the hitch as it routes to the center of the vehicle and reinstall our fasteners securing our green wire.

With that completed, Ill now move back to the passenger side taillight assembly, make connection with the manufacturers wire and our taillight assembly and reinstall it. Now with both taillight assembly reinstalled, this will complete the installation of our T1 connector part number 118450 on our 2012 Chevrolet Traverse.


Questions and Comments about this Video

Rich K.

Hello. The harnes was easy to install. How ever the green wire was 2 feet short. Also the plug mate was missing for my trailer.Please reply.Rich K.

Etrailer Expert
Reply from Patrick B.

Sometimes the wiring length is a little short. We try to always show how install the harness, as-is, in our videos. If we have to splice or add, we'll explain that and show it. We have noticed a few folks with the same comment, so we'll pass the feedback along to Tow Ready. I'm not sure what you mean by "plug mate was missing for my trailer." If you could clarify or tell me what from the picture on our site was missing.

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