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Tekonsha T-One Vehicle Wiring Harness Installation - 2019 Jeep Wrangler Unlimited

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How to Install the Tekonsha T-One Vehicle Wiring Harness on a 2019 Jeep Wrangler Unlimited

Hey everybody, Ryan here at etrailer. Today on our 2019 Jeep Wrangler Unlimited, we're going to be taking a look at and showing you how to install the Tekonsha T1 vehicle wiring harness. A lot of our Jeep customers use their Wrangler Unlimited to do a little bit of everything, which does include towing, and some people even like use some wide up accessories like a cargo carrier, for example, and that's where our wiring is going to come into play. It's going to provide us with the necessary lighting functions, not only to remain safe, but legal, as well.So one of the things you're going to notice right away is how well-made the wiring is, and that's especially important for a Jeep. A lot of our customers put their Jeeps through the ringer going off-roading and are really hard on them. So you're going to want a wiring kit that's built to last, and this one is exactly that.

Everything is put together really nicely and should last a very long time.Now, as far as mounting options go, what you could do is simply use the rubber dust cover to loop your wiring around your safety chain opening here, or you could do like what our customer chose today and pick up a bracket. So this bracket is sold separately, but it allows you to permanently mount it out here, and it gives it a nice clean look. If this is the route you want to go, you can find many different brackets available right here at etrailer. Now, even though this dust cover does do a good job at keeping out dirt and debris, I do suggest to prevent your terminals from getting corroded over time is just every now and again, apply some dielectric grease to them. That'll ensure that they stay in very good shape.So one of the things I really like about this kit is the fact that it uses a module box.

That's going to be located just behind your driver's side tail light. Now the whole point of that module box is to protect your Jeep's factory wiring if a short or an electrical issue we're to occur on the trailer side, and to me, that gives me a little peace of mind. You don't want to jeopardize your factory wiring. Nowadays, it can be really complicated, and with the module box, that's something we're not going to have to worry about doing.Now, we do get a lot of questions asking about a seven-way. That way you're able to use a brake controller, and all you need to do is pick up a kit called the ETBC7, and that's going to allow you to use that in conjunction with this wiring here.

That way you can have your seven-way connector and be able to hook up a brake controller up front inside of that Jeep, but at the end of the day, a really nice wiring kit you really can't go wrong with. Now, as far as the installation goes, it's really not too bad. It is a little time consuming. I will say the longest part is probably routing the power wire from the back here up to the engine compartment, but I'll show you how I did that, and I think it turned out really nice, but speaking on the installation, let's go ahead and put this all together now.To begin our install, we're going to be here the back of our Jeep, and the first thing that we're going to need to do is remove our tail lights. So just on the inside, there's going to be a little access panel that we can get to that way we can pull these lights out.

So now inside of our Jeep, if you look right here, you're going to see a little plastic access panel. So we can pop that off. Let's take a Flathead screwdriver. We're going to pry underneath of it, set that to the side, and under that panel, that'll expose this 10 millimeter plastic fastener here.I need to take that out. So I grab my socket. We'll just pull that all the way out. Now, be mindful that this fastener is plastic. So make sure you're on there good. That way you don't damage it. It pulls out relatively easy, and this is actually going to be the only fastener holding our tail lights in. So once I have this one removed, I'll go ahead and repeat that same process over on the other side.Now we can go ahead and just grab our taillight, and you're going to want to kind of pull it back towards you, and once we have it out like this, we need to unplug it. It's going to be a red little keeper tab there. What you can do is kind of just pull that back. Then you can push down on the center, and disconnect it. Other side's set up the same way. So remove that one as well.Now what we can do over here on the driver's side is take our new trailer wiring, and we're going to take our four way flat connector and our T connector with the green wire going to it, and we're going to drop this down through an opening here in the taillight pocket. That way these will come out from underneath the bottom of our Jeep. We're just going to kind of let them hang for now. We're not going to start to route them or anything just yet.So here's that opening and the tail light pocket, where I dropped our trailer wiring down through, and I'm also going to do the same thing with our bundle of black power wire. Now we can grab the end of our bundle of black power wire. We're going to strip back the insulation a little bit. Give those wires a good twist, get them nice and tight. We're going to take the included heat shrink butt connector. It's going to slide over the bare end of the wire. Crimp that down. We can take the other end of our butt connector, and if you look, we're going to have a black power wire that comes off of our module box, and that's what we're going to hook it to. This one's already pre-stripped. We'll put that in it. Crimp it down. Since this has heat shrink ends, I'm going to come in with my heat gun and seal them off.Now what we can do is mount up our module box. So in the tail light pocket, right along this edge here, it's nice and flat, and that's where I'm going to put it. A little tricky to see, but it's easy to get to. That being said, you want to clean this surface off real well with some rubbing alcohol, as well as your module box, and I have done that already. What we're going to do is use the included two sided sticky tape. So we'll get that backing paper off, push it solid onto our box, that other side off, and we can just line it up where we want it and simply just push it in place. And here's what it looks like once we have it secured in place.Now we can grab our white wire, which has the pre-attached ring terminal on it, and that's actually a ground. So we're going to need to secure it to the body of our vehicle. So this edge here is nice solid metal, and that's where I'm going to secure it. Does come included with a self tapping screw. So I'll just run that down in place.Now we can grab our T connectors with the yellow and brown wires and plug one end into our factory wiring here. The other end is just simply going to plug back into our taillight. So we get those connected, and we can just re-install our tail lights. These lights will just go in the opposite way that we removed them.Now underneath our Jeep, we can start to route all of our wiring. So we're going to route our four way flat connector, our green T-connector wire, as well as our black power wire. So here's where it comes down from the driver's side tail light pocket bundled up some extra wiring here, but all three wires go up and over frame rail, where they drop down right here. You want to do your best to avoid any hot or moving parts when you're running any wiring. Just use some zip ties to secure it, and our four way flat connector wire drops right down here to our hitch where we have it mounted.Now, I just used some wire loom just to put it over that, to help clean up our install look. You don't have to, but if you want to use some, you can pick it up here at etrailer. That being said, I continued on with our green wire and our black power wire. I just ran it up into long. It's part of the frame here. The black wire, I pushed inside of the frame rail towards the front of our Jeep. We'll kind of come back to that in a moment. Our green wire went up and over the frame rail again. It's a little tricky to see, but what you can do is run that wire up into the taillight pocket, very similar to how we have it set up over on the driver's side.So now on the passenger side, here's where our green wire came up into the taillight pocket. It's the same as the other side. I'm just going to take our T connector, plug one end into the factory wiring. We can grab our tail light and get the other side plugged in, as well. Once we have these snap together, you can simply just reinstall the tail light, the opposite way that we removed it. Now back underneath the Jeep, you can come back to our black power wire. Now, the way I got this all the way up to the front and to the engine compartment is I actually just utilized the frame rail. So I actually ran that wire inside of our frame. That way, if you do end up going off-roading or anything like that, we know our wire will be protected and we won't have to worry about anything happening to it.So I pushed it into this opening and then simply just pushed our wire towards the front of our Jeep. Now, just kind of a tech tip, what I did at some points to make getting our wiring through our frame rail a little bit easier is I used to pull wire. So this is a piece of nylon air tubing. You could also use a coat hanger or something like that. What you can do is go to one opening to the next opening in your frame rail, run that full wire through it. Then, say, if your power wire's coming out right through here, you can tape it to one end of that pull wire. Once you have it taped, you can pull that wire, and that'll actually feed your power wire to that next hole, and then you can just continue to do that up into the front.So once we routed our power wire through the frame rail, right here is where I actually pushed it out of the frame. So it's kind of just behind our front tire, and I just shot it up and attached it to this factory wiring, and then I routed it up into the engine compartment, nice and tight against our firewall. Now the way I got it up there was that pull wire like we talked about earlier, except this time I took the pull wire, dropped it down from the top to where the end of the wire was here, taped our power wire to it, and then simply just pulled it back up where we need it to go.So now if you pop the hood, right here in this area is where our power wire came up. I simply routed it along our fuse box down along this corner, to right here. Now, we're going to connect a fuse holder to this and eventually put it to the positive battery terminal. We'll get our fuse holder ready. I'm going to open it up, make sure the fuse is not in it. That's going to be the very last thing we do. We're going to cut that fuse holder in half, strip off both ends of the insulation. One side of that fuse holder is going to get a ring terminal and that'll just slide on. We can crimp it down.The other side of our fuse holder, take a heat shrink butt connector, slide it on and get it crimped. You can kind of eyeballed a length here that we need and trim off any extra black power wire that we might have. In our case, I'll cut a foot or so off, and that end will get stripped back, and we'll simply connect it to our fuse holder there. Once I get it crimped down, we'll come back with my heat gun and seal up the ends.So now to get our fuse holder connected to the battery, if you lift up on this red cover and through that little opening in the cover, I just pushed our fuse holder wire through that. What we're going to do is connect our ring terminal to this empty stud here. So I'm going to take a 12 millimeter socket and pull that nut off, take our ring terminal, slide it over it, and simply just tighten our nut back down. With that connected, you can kind of put your cover back in to position there. We'll come back to your fuse holder itself, grab the included fuse and pop that in place.Now that we have everything hooked up, it's a good idea to test the wiring and make sure that it's functioning properly. I'm using this little tester and you can pick one of these up here at etrailer. That being said, we'll go ahead and hit our left turn, our right turn, our brake lights and our running lights, and that'll finish up our look at and our installation of the Tekonsha T1 vehicle wiring harness on our 2019 Jeep Wrangler Unlimited.

Info for this part was:

Employee Joshua S
Video Edited:
Joshua S
Employee Jacob T
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Jacob T
Employee Dustin K
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Dustin K
Employee Chris R
Video Edited:
Chris R
Employee Cole B
Installed by:
Cole B
Employee Shane H
Test Fit:
Shane H
Employee Conner L
Test Fit:
Conner L
Employee David F
Test Fit:
David F
Employee Ryan G
Test Fit:
Ryan G
Employee Jonathan Y
Video by:
Jonathan Y
Employee Michael B
Video by:
Michael B
Employee Aidan B
Video by:
Aidan B

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