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Tekonsha T-One Vehicle Wiring Harness Installation - 2019 Jeep Grand Cherokee

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How to Install a Tekonsha T-One Vehicle Wiring Harness on a 2019 Jeep Grand Cherokee

Shane: Hi, I'm Shane with Today we're going to be taking a look at and showing you how to install the Tekonsha T-one Vehicle Wiring Harness with four pole flat trailer connector on our 2019 Jeep Grand Cherokee. This is what it's going to look like when it's installed. This is going to give you all the proper lighting functions to safely tow a trailer, your running lights, both brake lights and both turn signals.It's going to have a nice dust cap. It's going to cover your connections, keep any dirt and debris from building up. It's going to give us five amps per circuit for our stop and turn signals, 7.5 amps per circuit for our tail lights.

For easy installation, it's going to connect to factory wiring behind each tail light. We're going to have a power wire to run up to the front and attach to the battery.Now that we've gone over some the features, let's show you how to get it installed. We're going to start by removing our tail lights. We're going to have two push pin fasteners right on the inside. We're going to pull out that center like that.

And then we're going to pull out the whole thing. To remove our taillight, we're going to come straight back with it. It's a good idea if you have a trim panel tool, to help you out, you can kind of pry on it, just a little bit, to help pull it back.You're going to have some connectors in there. And what we're going to do, is we're going to go ahead and disconnect all of our wiring. We'll start with this top one.

The other two we're going to disconnect the same way. You're going to have a red tab, push up the red tab, and then you're going to push, just like that. And then we'll set our light aside. And we're going to repeat that process for the other side.Next, we need to get our wiring up behind our bumper fascia. One way to do it, is you can use an airline tube, you could use a hanger.

Anything that you can stick down in between the body and the fascia, itself. What I like to use is a nut on the end of a string. We're going to take it and drop it right down and it's going to come out the bottom, just like that. We're going to take our wiring harness, we're going to take the yellow end and we're actually wanting to get this whole end up. Stick it through, just like this.And then we're just going to match our plugs. And these three will plug back into the light. Now we can reinstall our tail light. Before we route our green wire over to our passenger side and our four pole wire to the center of the hitch, we need to mount our converter box. Our kit's going to come with some two sided sticky tape. We're going to stick it to the back of our box. We want to find somewhere flat to mount it. Right here is a nice flat spot. You just want to make sure that it's clean. Once you get that spot, we're going to take it like this, make sure you press it firmly into place.Then we can move to mounting our ground wire. Your kit's going to come with a self tapping screw, so you just want to make sure it's grounded to metal. I'm actually to go right in this area here. And we're going to take our power wire and we need to connect it to the power wire coming out of our converter box. Our kit's going to come up with a heat shrink butt connector. Connect those two ends. You may need to strip the end of your wire that comes in your kit. Then I'm going to take a heat gun, I'm going to shrink that up. If you don't have a heat gun, you can find those here at my four pole wire, I went over top of my bumper beam, which is right here and you can see I just zipped, bundled up and zip tied it here. And we're actually going to add a four pole bracket, so this will have a permanent mounting location. Green wire, you can see how I ran it right up above my bumper beam, attaching it to that existing wiring, that's the sensor wiring. You have your exhaust that comes out here. So we went over top of the bumper beam over there. We're going to do the same thing to get it up. Pull it up with the nut on the string.Our fire wire that's running to the front, you want to make sure when you route it, you route it, stay away from anything hot or moving. Found this existing line, put a couple zip ties on it, went over top of my axle, over top of my cross member here, through the bracket on my fuel tank, followed the edge of the fuel tank to this panel. Went through the panel, all the way up to this cross brace. Went over the top of this cross brace because our exhaust runs right on the inside of our frame rail there. Went right here, went across. I got it hung down right here.Now what I'm going to do, is I'm going to go up top, I'm going to drop something straight down from this area, attach my wire to it, pull it back up, so we can connect it to the battery. Run my wire straight up. Our battery is on our passenger side, so I just went around this plastic retaining clip here, ran it straight across, zip tied it on each of them, over to the passenger side, where we have our positive hookup.Now, go ahead and take a 13 millimeter socket, loosen this nut here. Go ahead and add your other butt connector on. Then you're going to take your fuse holder and your ring terminal, cut the wire in half on your fuse holder. You're going to strip back both ends. One end you're adding the ring terminal, the other end add it into your butt connector.Take your heat source, shrink up your butt connector. Go ahead and add your wire to that positive post. I already installed that. Once you have installed the wire onto the positive battery post, then you can add your fuse. Once you've added your fuse, test everything out and make sure everything's working correctly.Now let's test out our wiring using part number I26. Brake lights, left turn, right turn, running lights. That'll do it for a look at and installation on Tekonsha T-one Vehicle Wiring Harness with four pole flat trailer connector on our 2019 Jeep Grand Cherokee.

Questions and Comments about this Video


Do these instructions also work on the 2019 Cherokee?

Etrailer Expert
Reply from Jacob H.

This 4-pole wiring harness is designed to work with the 2014-2020 Jeep Grand Cherokee.

Edward B.

Will this kit void my warranty.

Etrailer Expert
Reply from Jon G.

You are protected under the Federal Magnuson-Moss Warranty Act when it comes to the Tekonsha T-One # 1118727 . The Act states that if something breaks on your vehicle and you take it in for warranty repair, the dealer must honor your warranty unless whatever modifications you have added to your vehicle actually caused the problem in question.


Does the jeep need an ecu flash to run this wiring?

Etrailer Expert
Reply from Jon G.

You won't have to take your Jeep to the dealer for the T-One # 118727 to work properly. This kit draws power directly from the battery so it won't be affecting your OEM wiring like other kits do.

Info for this part was:

Employee Jacob T
Video Edited:
Jacob T
Employee Chris R
Video Edited:
Chris R
Employee Dustin K
Video by:
Dustin K
Employee Zach D
Video by:
Zach D
Employee Jonathan Y
Video by:
Jonathan Y
Employee Michael B
Video by:
Michael B
Employee Cole B
Installed by:
Cole B
Employee Shane H
Test Fit:
Shane H
Employee Robert C
Test Fit:
Robert C
Employee David F
Test Fit:
David F
Employee Bradley B
Test Fit:
Bradley B

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