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 and showing you how to install the Tekonsha T1 vehicle wiring harness for factory tow package with a 7-way trailer connector, part number 118271. To help us what our installation. We're going to be using the Pollack mounting bracket and installation hardware for 7-pole and RV style trailer connectors. Here's what our wiring is going to look like once we have it installed.Now, I do want to mention that the bracket is sold separately, but you can pick it up here at etrailer.com. Our wiring's going to provide us with the 7-way RV style trailer connector. Which is going to give us all of our lighting functions like our stop lights, our taillights, and our turn signals, as well as the option of putting a brake controller later, if our trailer has electric brakes.Now it's going to have this nice dust cover that's spring loaded to keep all the dirt and debris out, make sure we don't get any water or moisture buildup inside.

And like most 7-way connectors, it's going to have this catch here that's going to clip onto the end of our connector on our trailer to make sure it doesn't get pulled out. The nice thing about this wiring is that we're not going to have to cut or splice into any of our factory wiring. We're just going to have a simple plug in connection over on the passenger side, behind the bumper, that's going to plug directly into our factory tow package.We will have to put it in a few relays and fuses in order for a wiring to work though. So here's what's going to come in our wiring kit. We're going to have our harness along with our 7-way plug and all the necessary fuses and relays to get it in place.

On our vehicle, we're going to have a plug that's going to match up to this, that we can plug it into. On the other end, we're going to plug into our 7-way connector.Now, in order for everything to work, we are going to have to get those excuses and relays in to activate the wiring. To mount up our 7-way plug, our bracket kit's going come with a bracket and all the hardware in order to get it in place. Now we're using it on a Draw Tite hitch that already has a mounting bracket installed on it, so we're only going to need to come up with a few more screws to mount it on there. The hardware is going to mount our plug to the bracket, and they do provide you with a couple self tapping screws if you don't have that bracket, and you want to mount it directly into the bumper.So to start, we're going to go ahead and mount our 7-way plug into the bracket.

Now our bracket's going to have several holes along the edge here, so we're just going to want to line all four of them up. We can take the included screws, drop it through the front. And then we'll secure it on the back using the provided nuts. And right now we're just going to get it all of them in place, hand tight. Then we can come back, and secure them down.

Just want to grab a screwdriver, and we can tighten up our hardware.And the nuts on the back, our locking nuts so we can actually just hold it with her hand and it should tighten up and not spin on us. But if you are having a little bit of trouble getting them tightened down all the way, you can get either a 3/8 socket or a 10 millimeter socket and tighten them up. Now we can take our 7-way plug mount it to the bracket. Going to line it up with the bracket on our hitch, and drop the hardware down, coming from the top. And secure it with a nut on the bottom. Again, you just want to get this in there hand tight, just so the bracket will hold itself up. And we'll get the rest of our hardware in and secure it down.Now these two screws or bolts are not included. You will have to provide these two ones, so whatever size you're using, just want to get that ratchet and tighten them down. We're using the same style of lock nuts and screws that we used to mount our 7-way socket to the bracket. So since our lock nuts, and you can just go ahead and tighten those up and hold the screw by hand. But the bracket mounting, we're going to move over to the passenger side right on the outside of the Muffler. And if we go up in the bumper area, when we reach up, the plug's going to be in between the outer bumper and the inner part of the body right here. And it's going to be attached using a little plastic clip against the body.You don't have to pull it down, but if it makes it easier to get it to plug in you can go ahead and get a screwdriver or something in there and pry it away from the body. You're going to want to grab the harness now. And before we plug it in, I'm going to put a little bit of dielectric grease inside my connector. And that's just going to help prevent any kind of corrosion buildup, and hopefully keep the moisture out. So we can take our connector, we're going to line it up the connectors on the factory harness. We're going to plug it in. It maybe a little bit of a tight fit, just to get your hand in there.Once you have it plugged in, and you want to give it a gentle tug to make sure it's locked in place. And then we're going to take a harness, and with our connector, we're going to route it over to our 7-pole. So you're going make sure that you sure your wires behind the bumper here, using the included zip ties in our kit. Right here at the corner, behind the muffler, we're going to have this plastic. I'm actually going to take a zip tie and I'm going to go around that tab right here. I'm going to zip tie my harness to it just to keep it away from the muffler as much as possible.Again, we're just going work our way towards the center securing our harness along the way. Go to the bumper support, put another zip tie, and we can zip tie our harness to our hitch until we can get over towards our 7-way. We'll can come back and cut all the tails off of our zip ties. Now, put a little bit more dielectric grease in the other end of my connector. Then we can line it up with the back of our 7-way, and plug it in. With our wires ran down here, we can move under the hood and get all of our relays and fuses put in place.So 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 out. So if we just push down on that tab towards the bottom, we'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 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. So 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. Now that fuse is going to be our trailer park lamp. So we can take our 10 amp fuse, put one of them right there.Next if we come to where 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 in each spot. And 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. So we come to that spot right here, which should be labeled F8, if you 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 going to be for the trailer brakes. So we're going to take our 30 amp fuse, put it in place. And then the one right above that is going to be for our trailer power. So again, we'll take one of our 30 amp fuses, should be the last one, and put it in its spot.So 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. Take one of our relays, put it in place. And then right next to that, we're going to put another one of our relays in. And that should be all the fuses and relays that we have to put in. So we can go and test our wiring and make sure everything works.Just put our cover back in, make sure it locks into place. Now on 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. So now I'm going to plug in my 7-way tester, I'll all my lights. That way, I can verify that they're all working properly. I turn my headlights on, we can see that they're working, along with my left turn signal, right turn signal and my brakes. All we have left to do is hook up to our trailer and hit the road.And that'll finish up your look at the Tekonsha T1 vehicle wiring harness for factory tow package with the 7-way trailer connector, part number 118271 on our 2014 GMC Acadia.


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Employee Zack K
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Zack K
Employee Joshua S
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Employee Sue W
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Employee Kathleen M
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Employee Nicholas E
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