Trailer Wiring Harness Installation - 2014 GMC Acadia

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How to Install the Trailer Wiring Harness on a 2014 GMC Acadia

Speaker 1: Today on our 2014 GMC Acadia, we're going to be taking a look at showing you how to install the Tekonsha T-one vehicle wiring harness for factory tow package, with 4-pole flat trailer connector, part number 118270. To help us with our installation, we're going to be using the tow-ready mounting bracket for 4-pole flat trailer connectors, part number 18144. Here's everything that's going to come with our wiring. We're going to have a harness. One end's going to plug directly into our vehicle end. Then the other one's going to have a 4-pole flat trailer connector.

It's going to come with all the necessary fuses and relays to activate the wiring and get it working. The bracket we're using is a 4-pole bracket, and it does come with all the hardware to get it in place. Now, we're using it with a Draw-Tite hitch that already has a built in bracket to mount our 4-pole bracket to, but if yours doesn't, we do have a wide variety of brackets here at's go ahead and show you how to get everything in place. To begin our installation, we're going to come to the very back of our vehicle, towards the passenger side. We're going to go just to the outside of the muffler and we're going to be looking straight up into the bumper, in between the outer section and the body here.

Now, if we reach up, we're going to find a connector, and that's the connector that we want to plug our harness into. Now, it is connected with a push pin connector to the side of the body, however you don't have to pull it down. It may make it a little bit easier to make your connection, but we can make it leaving it up there. We can take her harness and before we plug it in, I'm going to take a little bit of dielectric grease, put it inside my connector. That's just going to help prevent any kind of moisture and corrosion from building up inside.

You want to take your connector and line it up with the factory connector, plug it in, make sure it's locked into place. Once it is plugged in, you just want to give it a gentle tug to make sure it is locked in.Now, we can take the rest of our harness, and we're going to route it towards the center of our hitch. You want to take some of the included zip ties and secure it so you can keep it as far away from the muffler as possible. As we come to the very back, inaudible 00:02:23 route it straight back, and we're going to have this plastic section here. I'm going to take one of my zip ties going through that small hole and inaudible 00:02:33 use that to secure my harness, so ...

and keep it away from the muffler. We're just going to keep finding different spots along the back edge here to zip tie it to, securing it all the way until we get to the center, towards the hitch. Then right towards the center, we're going to have a bumper support. I'm going to take my wiring and zip tie it to that. You can always go up and behind our hitch, hiding the wires a little bit and secure it using a few more zip ties.Cut all the tails off of our zip ties. Now that we have our wiring close to our hitch, we can mount our bracket up. Our bracket's going to have two holes that are going to line up with the bracket on our hitch. We're going to drop down a screw, lining up the two holes, and we can secure it on the bottom with a lock nut. We'll do the same thing for the other one. We'll come back with a 10-millimeter socket and then we're going to tighten up the nuts on the bottom. Since they are lock nuts, you can just kind of hold the top screw with your finger, that'll hold it in place, and keep it tight.Now a 4-pole, if we look, it's going to have a small little rib right here, that's going to fit in between these two tabs on our bracket, and that's what's going to keep it secure. We're just going to push it through. You may need to work it up and down and back and forth to get both of those tabs to go through the bracket. Once you have it, you could see this going to hold it nice and secure. The excess wiring, you can just kind of bundle up behind our hitch here. We'll take another zip tie and secure it so it's not hanging down. It's also kind of hiding the wire themselves. For the wiring that's coming across from the back bumper, going over to the hitch here, just because it is sticking out a little bit and the color of the wire is sticking out, I'm going to take a little bit of electrical tape, I'm going to wrap my wire. Kind of help protect it a little bit and hide the color from the back of my car here. It's not necessary. It's just one of those extra steps you can take to kind of clean everything up a little bit.With our wiring in place, we can move under the hood and get all the relays and fuses done. Over on the passenger side, under the hood is where our fuse box is going to be. We're just going to have two tabs on each end that we're going to have to release so that we can get our fuse box up. So we just push down on the tab towards the bottom, you'll be able to release the clip, and our fuse panel will come off. Now, we're going to be looking for the fuses that we need you to put in and they're all going to be labeled here on the cover, so we'll start with all of our 10-amp fuses first. If we come to our fuse box, towards the center, we're going to have this gray relay right here, with an open spot for a fuse right next to it. That fuse is going to be our trailer park lamp. We can take our 10-amp fuse, put one of them right there.Next, if we come to where a three black relays are here, right next to that we're going to have an open spot and right below that we're going to have an open spot. Those two spots are for our left and stop and our right and stop, so we're going to put one 10 amp fuse into each spot. We're going to have one more 10-amp fuse, and if we come towards the passenger side, we should find a 20-amp fuse next to a gray relay right here. We come to that spot right here, which should be labeled F8, if we look really close. That's going to be for our trailer backup. We're going to take our last 10-amp fuse and put it in that spot.Now we should have two 30-amp fuses, so if we come towards the center, we'll have this bundle of fuses right here. We'll find a 25-amp fuse right above those, towards the center, will be two open slots. This one right in front of it, is gonna be for the trailer brakes. We're going to take our 30-amp fuse, put it in place. Then the one right above that is going to be for our trailer power. Again, we'll take one of our 30-amp fuses, should be the last one, and put it in its spot. Now we're going to have a couple of relays we're going to need to put in place. Towards the driver's side of the fuse panel, we're going to have two spots open between two factory relays here. We'll take one of our relays, put in place. Then right next to that we're going to put another one of our relays in. That should be all the fuses and relays that we have to put in, so we can go ahead and test our wiring and make sure everything works.Just put our cover back in, make sure it locks into place. In our kit, they do give you a couple extra fuses. We're going to have a leftover relay and a leftover 30-amp fuse, but those are all the relays and fuses that we need to get in place. Now all we have left to do is to test our wiring. We're going to be using a 4-pole tester. If you need one, you can pick one up here at using part number I26. I plug it in, then I'll go ahead and run my lights and make sure that they're all working properly. If I turn my headlights on, we could see that they're working along with my left turn signal, right turn signal, and my brakes. Now all we have left to do is hook up to our trailer and hit the road. That'll finish up your look at the Tekonsha T-one vehicle wiring harness for factory tow package, with 4-pole flat trailer connector, part number 118270, on our 2014 GMC Acadia.

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