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Trailer Wiring Harness Installation- 2010 Buick Enclave

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How to Install a Trailer Wiring Harness on a 2010 Buick Enclave

Today on this 2010 Buick Enclave we are going to be installing wiring harness part number 118450. We are at the rear cargo area of the Enclave, and we are going to locate the ports that we are going to be plugging our wiring harness into. These ports are actually located directly behind the tail light assembly on both the driver and passenger side. So, the first thing we want to do is remove both tail light assemblies. To do that we are going to open up the rear cargo door, there are two inboard screws holding the tail light into place. We need to pull back the covers to expose those. :30

With those two removed we just want to take and rock the tail light back and fourth, there are a couple outboard side clips that are holding it in place as well. With that pulled back, you can see the connector that we are going to be plugging our wiring harness in line to. What I am going to do at this time is disconnect the two, you can do that by pressing the tab at the top here and then pull the two pieces apart. Now I am going to go over and do the same thing for the passenger side light as well. 1:06

Then we are going to start on the driver side of the vehicle, and start plugging our harness in line. On the driver side we are going to be plugging in the port with the yellow and brown wires in them before I actually plug my tail lights back in. We are going to do a couple of other things first, you can see we have a white wire here with a ring terminal on it, that is our ground wire. We need to secure that to the metal on the backside of the tail light assembly. We are going to do that by using the self tapping screw that is provided with the installation kit. Next, we need to take the plugs for the passenger side, along with the 4-pole itself, and feed it down between the opening of the body and the bumper here. 1:44

This space is a little limited though, so to help give us more working room we are going to take off theses two inboard side screws holding the bumper in place. Next, we can start feeding our wires below. With those routed through, I can put these two screws back into place. Then we can plug the other end of the harness back into the tail light. With that done we can put the driver side tail light back on. Now we can move underneath the vehicle and start routing our wires into place. Back up underneath the vehicle, what we have done is take our passenger side connector and our 4-pole wires and routed them up and over the bumper bracket. This is going to help keep it away from the exhaust system. From here I am going to take a 4-pole end and route it to the center of the vehicle. I am going to tie it off at the trailer hitch. Then I am going to take the passenger side connector and route it all the way across. Again, we are going to go up and over the bumper bracket over here as well. 3:17

With it up and over the bumper bracket I am going to take and feed it through the same opening between the bumper and body assembly. Then we will attach it to the passenger side tail light. To aid in the fishing of the wire up to the passenger side tail light, what I have done is route a piece of black gauge wire from the tail light assembly down. I am going to take and tape my harness to it. That is going to allow me to pull it up into place much easier. Then we can just plug our harness in line. From there you want to do a quick double check underneath the vehicle, you want to make sure you do not have any loose or hanging wires that can get pinched or damaged. And your installation will be complete. That will complete the installation of wiring harness part number 118450 on a 2010 Buick Enclave.

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