Tekonsha T-One Vehicle Wiring Harness Installation - 2020 GMC Acadia

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How to Install the Tekonsha T-One Vehicle Wiring Harness on a 2020 GMC Acadia


Hi there Acadia owners. Today on your 2020 GMC Acadia, we're going to be taking a look at and showing you how to install to tekonsha seven pole vehicle wiring harness. And this is what our harness looks like when it's installed. Now we do have additional bracketry installed here to get our seven pole mounted up as it doesn't come included. But what you do get with your harness is everything that you'll need to get a functioning 7-way, just not the mounting brackets to get them mounted up. Our 7-way is a standard 7-way that has all the necessary outputs that you would expect on it which includes your left turn signal, right turn signal, tail lamps, and brake lamps, as well as a charge line circuit to charge the batteries on your trailer, reverse light circuit for your backup lights, as well as the brake signal circuit.Now in order for the brake signal circuit to work properly on your Acadia you will have to have a brake controller installed.

We have brake controllers available here etrailer.com and I recommend you use our fit guide to get the best one for you as well as the appropriate wiring solutions to get that brake controller up and running. But what I really do like about this harness is how easy it is to install because on the other end of our seven pole here, it goes to two custom connectors that are specifically designed for our Acadia and they plugged directly into our factory connectors above here. So it only takes a few minutes. Why don't you follow along with me and we'll have it installed before you know it.We'll begin our installation underneath the vehicle by retreating the factory connectors that we'll need to tap into. They're pretty close to the center but slightly on the driver's side.

So we can go in over here and this opening next to our hitch, we'll then reach up, we're going to pull down the large connector here with four wires going to it. This is one of them that we'll need. Once you've got to pull down the red locking tab here, you'll just push up to release it and then we can press it on the release tab there and pull the dummy plug out of it.It's easier if you use one hand to press in on the release tab and the other hand to pull the dummy plug out. There's another connector we're going to need up here as well though and it's located just below the connector we took out, we've got this plastic piece right here and this one's located just on top of that plastic piece. So we can just pop this one off of there as well, and we're going to press it on the release tab here, and then we can slide out that dummy flag.We can now take our new harness and plug it into our factory connectors.

We're going to start with the larger connector. This little slots here at the corners. We're going to line those up with the slots here on our new connector. I'm going to simply just push together, make sure they click in, then we can move on to the smaller four wire connector. We're going to line up lock tabs on that and the release tabs, click those together and then push the red locking tab down to secure it in place.

We can then push these connectors back onto their mounting locations where we fold them down from.Your larger connector may or may not be able to plug back in due to the harnesses being so close to one another. So I'd recommend plugging in the four wire connector back in its mounting location. The other one here, just due to how close the new harnesses is going to prevent the other one from flicking back in. Now you're going to need a location to mount your seven pole connector. A bracket does not come included with your kit, so you will need to purchase a bracket. We're going to be using two different brackets for our solution so we don't have to make any modifications to the vehicle. We've got both of those brackets here. Here we have our seven pole bracket which we have attached to our long no-drill bracket. Now you could just get a seven pole bracket and run it into your hitch or something like that or your bumper but then you have to modify it. If you get a no-drill bracket like this, it will go on your hitch.You'll receive a clamp that comes with it. That will just go right around your hitch. We'll slide the other end of the clamp through there. It's all right if it slides down we can adjust it here as we're tightening it up. And then once you've got it pretty well where you want it, we'll just push the little end down. That'll kind of hold it in place and we'll just tighten it up with an eight millimeter socket. The excess here you can trim off and I do recommend it. We can now take our new seven pole connector. We're going to slide it into our bracket and then mount it to the bracket using the hardware that comes included with your bracket. Slide your bolt through and then secure it with the nuts on the opposite side, we're going to do the same thing with the three remaining holes.We can now take the connector on the opposite end of our harness and plug it into the back of our new seven pole connector. Line those up and click it into place. After you've got it clicked in. I do like to take the back and just give it a little tug to make sure that it doesn't come off when you we're giving it a little tug make sure you don't have the release tab pressed in or else it will come off. I highly recommend that you put a generous amount of dielectric grease inside your connector to keep out any rust and corrosion. You can get dielectric grease here at etrailer.com. We can then just use the included zip ties to clean up our wiring and keep it all tucked up behind our bumper. And we're ready to plug in our tester and make sure everything's working properly. We've now got our tester plugged in here and I highly recommend you use a tester like this instead of your trailer, to ensure that your vehicles wiring is all working properly. If you did have a false on your trailer it could throw you some false information you may think there's an issue with your wiring. You can get a test or like this here at etrailer.com and you'll notice that it's already lit up as soon as we plugged it in that's our charge line circuits. So you can see the charge lines working properly on our seven pole. But in addition to that, you want to make sure you have your left turn signal, right turn signal, tail lamps, brake lamps, as well as your reverse lights. And lastly, you also have your brake signal which we can't show you today because we don't have a brake controller installed on our vehicle. But if you did have a brake controller installed with everything working properly though we're ready to hook up our trailer and hit the road. And that completes our installation up tekonsha seven pole vehicle wiring harness on our 2020 GMC Acadia..


Questions and Comments about this Video

Info for this part was:

Employee Jacob T
Video Edited:
Jacob T
Employee Dustin K
Video Edited:
Dustin K
Employee Chris R
Video Edited:
Chris R
Employee Cole B
Installed by:
Cole B
Employee Robert C
Test Fit:
Robert C
Employee David F
Test Fit:
David F

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