Tekonsha T-One Vehicle Wiring Harness Installation - 2019 Subaru Ascent

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How to Install the Tekonsha T-One Vehicle Wiring Harness on a 2019 Subaru Ascent

Today, in our 2019 Subaru Ascent, we're going to be installing Tekonsha's T-One vehicle wiring harness with four pole flat trailer connector. This is what our wiring looks like when it's installed. You might be asking yourself, "Well, I don't see any wiring." That's because it's hidden beneath our storage compartment here and ready to use whenever you need it. When you're ready to use it, you just want to drap it over the back. You want to make sure that you stay away from the striker here in the middle, and it's just going to pinch between our weather stripping. That's fine because it's not going to cause any damage to it.

It's going to compress it and keep it in place. We can now make our connection to our trailer and hit the road.This is going to provide you with your left turn signal, right turn signal, tail lamps and brake lamps. It'll be DOT compliant in all states. On the end of our connector here, you're going to have a dust cap that can help keep out any dirt, debris, and moisture, ensuring a long-lasting connection. You can also use the dust cap to secure it to your hitch's safety chain loops.

Now, on our hitch here, we also have that hidden. It is behind the panel here. If you had a down hanging hitch that wasn't hidden, it would be much easier. You simply slide that through your safety chain loop and secure it like that.One of the biggest benefits of this kit is that it's simply plug and play. There's no cutting or splicing required, and the module that comes included with it will help protect your vehicle from any faults that may occur on your trailer.

If you have a short that happens on your trailer, the module will just shut it down and it won't cause any failures with the lights on your vehicle.We'll begin our installation here at the back of the vehicle. We need to remove our storage cover. We can just sit this one up. That'll be fine. The cross strip that runs across the back side here, we're going to need to just pull that up and separate it.

Now we can remove the entire tray here. We're just going to pull upwards, releasing it, and we'll set this aside. We can now plug our harness in. You'll find your factory connector here, so we'll take the harness from our kit and plug it right in. We'll now need to connect our ground stud. We're going to hook it on the screw located right here. We'll remove the bolt with a 10 millimeter socket, slide our ring terminal on our white ground wire, reinstall the screw, and now we can plug in our tester and verify everything's working properly.If you need a tester, you can pick one up here at etrailer.com, or you can just plug it into your trailer. You want to make sure that you have your left turn signal, right turn signal, tail lamps, and brake lamps. With everything working properly, we can now secure our module. We'll take the double-sided adhesive that comes in our kit. We're going to peel off one side, stick it onto our module, pull the backing off of the other side, and we're just going to adhere it to the wall back here. And we're just going to hold it there for about 20 seconds to make sure that it stays secure.We'll use some of the zip ties in the kit to clean up our wiring. When we put our panel back in, we just routed it out the driver's side corner here and it will live inside of your rear compartment here when not in use. You can just wind it up and push it off to the side, and you're all done. That completes our installation of Tekonsha's T-One vehicle wiring harness with four pole flat trailer connector on our 2019 Subaru Ascent.

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Info for this part was:

Installed by:
Jeff D
Video by:
Joshua S
Video by:
Dustin K
Video Edited:
Jacob T
Video Edited:
Chris R
Test Fit:
David F
Test Fit:
Ryan G

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