Tekonsha T-One Vehicle Wiring Harness Installation - 2019 GMC Acadia

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How to Install the Tekonsha T-One Vehicle Wiring Harness on a 2019 GMC Acadia


Rob: Hey everybody, Rob here at Etrailer.com. Today, we're going to be taking a look at the Tekonsha T-One Vehicle Wiring Harness for the seven-way RV style connector for factory tow packages on our 2019 GMC Acadia. Now, having a seven-way RV style connector is going to be really nice because not only is it going to give us all of our light functions that we would normally get, like our taillights, our turn signals, and our brake lights, but it's also going to provide us with a 12 volt power source, our reverse lights, and if we later on down the road want to install a brake controller, we'd be able to have the function back here so we can control the brakes on our trailer.Now, like all seven-ways, this is going to stay on the outside of the car at all times, so you will need to pick up a bracket here. Now, we recommend the Pollak bracket because it's universal design. It makes it a lot easier to mount up your seven-way. Our seven-way is going to have a spring loaded door.

That way, we can keep all the dirt, debris and any kind of moisture from inside the connector, hopefully preventing any kind of corrosion. You'll see it's going to have a nice little weather stripping on there to really help out with that. A little notch here is going to make sure that when we plug it in, our cord is not going to get ripped out.Now, your seven-way connector is going to be one of the most common connectors on trailers. Typically, it is going to be for a little bit larger trailers that have brakes on them. If you have a smaller trailer that does not have brakes, we can still use our seven-way with an adapter that'll go down to either a four or five or six-way.

Now, the adapters are going to be sold separately, but you can find them here at Etrailer.com.Now, keep in mind when you mount your seven-way up, as you can see, our panel is not going to be able to go back in place. If you really want to put it back in place, really going to end up cutting most of the panel off so really the best option is to leave it off. That way, we can have our trailer hitch and our wiring very easily accessible. As far as the installation goes, it's going to be extremely straightforward. There's no cutting or splicing into our factory wiring.

It's going to have two connectors behind the bumper here that we'll plug our new harness into, and then just mount up the plug and mount the bracket up. In fact, let's go and walk through the installation together.To begin our installation, we're going to come to the back of our Acadia. If we look up inside the body here right underneath this panel, so if we reach up, we'll find this large plug, it's going to have a dummy plug on it, kind of want to just bring it down for now so we have access to it. Then, if we look farther up, we'll see another connector up here. I'm going to grab this and pull it off the clip that's on the body so we can get access to that as well.

Now, on the small gray plug, we have this red locking tab, you want to slide that away from the end. Then, we're going to push down on the center and that'll release the cap so we can pull it off.The other plugs will be pretty similar. There won't be a locking tab on it. We just want to press down on the small black section here and that'll release the cap so we can pull it off. Now, we can grab our new harness. You'll notice that we're going to have two plugs that are going to match up to the ones in our vehicle, so we'll grab our connectors. We're going to start plugging them in. Whenever you plug your connectors in, when you hear that click, you know they're locked in place and we'll plug in our other connector. Then, once that's locked in and we hear that click, want to slide that red locking tab back in as well.Now, we can grab our seven-way connector and we need to mount it to our bracket. We want to make sure that we slide the end through, we'll line up the holes, and then we can use the hardware that comes with our bracket to mount everything up. Our bracket is going to come with some screws, so line up the holes so all four line up, pass it through. Then, on the backside, we're going to put a locking nut. I'm just going to get these all loosely started by hand. We don't have to worry about the connector falling off. Then, we can come back and use a screwdriver to tighten everything up.Now, since these are locking nuts, we should actually just be able to hold it with our finger, grab a flat blade screwdriver and tighten up the screw on the other side. Let's go back and tighten them all up, so that all four of those screws are nice and snug. Then, we can just simply line up our connector, plug it in, again making sure we hear that click or just give it a quick tug, make sure it is fully seated. We can just tie up our excess wire up high to the existing wiring that's already up there. That would be out of the way and give us a nice clean look.Now, the final step is going to be testing our circuits. Now, I went ahead and plugged in my seven pole tester so we can run through all the functions. If we look up at the top, we can already see that we have voltage going through, so we do have our power source. Go ahead and turn on my headlights inaudible 00:04:57 you'd see that my clearance lights are working as well as the left turn signal, my right turn signal and my brakes. If I put it in reverse, we can see that that function is working as well. If we want to, later on down the road, we can add a brake controller. Then, we'd be able to control the brakes on our trailer.Now that we've tested everything and everything's working properly, we can hook up to our trailer and hit the road. Now that we know that everything's working properly, that'll finish up your installation and your look at the Tekonsha T-One Vehicle Wiring Harness for factory tow packages for the seven-way RV style connector on our 2019 GMC Acadia.


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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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