Tekonsha T-One Vehicle Wiring Harness Installation - 2018 Jaguar F-Pace

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How to Install the Tekonsha T-One Vehicle Wiring Harness on a 2018 Jaguar F-Pace


Hey everybody Clayton here at etrailer.com. Here at etrailer, we install, test, and review a lot of different products to help you as a customer make a more educated decision before your purchase. Today we're gonna be working on a 2018 Jaguar F-PACE. We're gonna be taking a look at and I'll be showing you how to install the Tekonsha T-One vehicle wiring harness with a four flat. Adding four-pole wiring to the back of our Jaguar is gonna be essential whenever we're towing 'cause we need to get those necessary lighting functions back to our trailer. Those functions are gonna be our brake lights, our left and our right turn signals, and our taillight signals.

And this kit is gonna allow us to do that not only to legally, but also safely. That way everybody knows our intentions. Now probably the best feature of this kit is gonna be our module. Our module is actually gonna protect our vehicle's stock wiring from any backfeed that we might get from our trailer or any shorts or anything like that. So we're really not gonna have to worry about our factory wiring.

And in terms of installation whenever we're installing our wiring it's gonna be a whole lot easier if we do that when we're installing our hitch. Because our fascia's off, and we do have to take that fascia off to do either job. So it's gonna be a lot easier if we do it all at once. Now in terms of installation for the wiring in particular, it's not bad once you get the fascia off. Since our battery's in the trunk making that connection is gonna be pretty simple.

That being said, let's take a look at the installation together now. To begin our installation we're gonna be removing our underbody panel. We're gonna have three 10 millimeter bolts that we need to remove here at the front of that panel. We now need to remove four Phillips-head screws along the back of our panel. When you remove this last one you wanna make sure to hold on to that panel so it doesn't fall on you.

Now we're gonna open our rear hatch. We're gonna have a panel here on the side of our taillight. We just wanna grab a trim panel tool, kinda work our way behind here, pop those clips out and then remove it. We'll repeat that same process on the other side. We now need to remove a 10 millimeter bolt. It's gonna be right there at the corner underneath that panel. We'll have one of these on the other side as well. We now have a plastic screw that we need to remove down here at the corner of our rear fascia. You don't have to push very hard to remove this. Basically just barely put the screwdriver in there and turn it. And then once you get the head of that push pin out you're gonna take a trim panel tool, come underneath the lip there and pry out on it. And again we're gonna have one of these on the other side. Now that you've removed two Phillips-head screws from inside of our wheel well, it's gonna help to have a low clearance screwdriver or an attachment like this so you can actually get in there. One screw is gonna be located here and the other one is gonna be just below it on this lower panel. We'll repeat this same process on the other side. We're now gonna peel back our wheel well liner. I'm gonna have to kinda work in like this. And our instructions weren't very clear on this, but we are gonna have a combination of Phillips-head screws and T20 Torx bits along this little plastic mudflap. So we'll get those taken out now. Now that we have all that hardware removed, we just wanna to grab this and slide it out of the way. We'll repeat that same process on the other side. At the top corner of our fascia we're gonna have a 10 millimeter bolt. It's gonna run this way into our fender. So you just wanna grab that 10 mil, slide it in here and get that bolt removed. Again we'll repeat the same process on the other side. Now we'll grab some painter's tape and just run it along our seams here. That way once we pull our fascia off we don't risk scratching our paint. Now you don't have to do this, but I highly recommend it. Now with an extra set of hands we can start pulling off our fascia. We're gonna start at the corners, kind of pull up and out and you wanna do this very carefully making sure not to break any plastic fasteners or clips along the way. So then once you get here if your vehicle has wiring in the back now would be the time to unplug it. To unplug your wiring, you're just gonna push down on this tab and then pull out. Now we can set our fascia off to the side somewhere safe. With our fascia removed we can now grab our trunk lining. We're just gonna pull this out and set it off to the side. Now we're gonna lift up on our bottom panel. Then we'll take this out as well and set this off to the side. Then we wanna remove our spare. To do that we'll unthread this center bolt here in the middle. And this'll give us the access to our battery which is right underneath here. Now we're gonna have this styrofoam pad. We can lift this out of the way as well. Now we're gonna grab our rubber gasket around the outside of our door. We're just gonna pull this back and we're gonna grab this carpet. Kinda pull it out from the side here. And behind this carpet you can see that white wing nut. That's what is actually gonna hold on our taillight. So now we're just gonna grab this and turn. You might have to get in here with two hands to get it started. Once you get that off, you wanna make sure to hold the taillight that way it doesn't fall. Now we have our wing nut out. We'll set that inside so we don't lose it. Then we're gonna carefully pull out on our taillight assembly so you can see our wiring right here. We're gonna push down on this tab and pull this apart. Now you can set this off to the side. Now we're gonna repeat that same process over on the passenger side. We now wanna grab our harness and we're gonna lay our module inside. We're gonna take our wiring, kinda run that behind this fascia support. And you can pull it up from underneath. You might have to pull out on this plastic a little bit to get that to feed through there, or you can feed it back from here. Whatever you desire. And we'll pull this over. We wanna take our stock plug, we're gonna plug that into the smaller end on our new harness. Plug it until you hear a click. And then now we can wait to re-install our taillight assembly. We now need to find a good location to mount our module. I'm actually gonna zip tie it around our hitch with our two-sided tape. So we just wanna use some rubbing alcohol and clean off those surfaces. And the reason I wanna do it to the hitch is we're gonna be able to keep it out of the way of our exhaust. So we're not gonna have to worry about it getting damaged. So you wanna take that two-sided tape, stick it to our module. And we're gonna peel off that protective layer on the backside. Then we wanna very carefully lift this up and push it onto our hitch. And it's a good idea to hold this down for a few seconds to make sure that it adheres properly. Now I'm gonna run a zip tie around everything just to hold it down. Now we'll grab our power wire provided in our kit. We're just gonna strip back the end. We'll grab our provided heat shrink butt connector. We'll slide that on and crimp it down. Now we're gonna bring this up to our power wire and it comes off of our module, and it comes pre-stripped. So we're just gonna slide that into the connector and crimp it down. Now we're just gonna grab our heat source, come back and shrink down this butt connector. Then I'm gonna come back and add some electrical tape to our butt connector. You don't have to do this, but I highly recommend it just to help ensure a good connection. You don't have any electrical tape You can add that to your cart here at etrailer. We are gonna have a grommet right here behind our hitch. I'm gonna cut a slit in that and feed our wire through. You do wanna be careful however, 'cause there is wiring on the backside. You can just feed that wire through. We'll reach on the back side, and give it a pull. Now I just wanna take this green wire and route it over to the passenger side. We're gonna make that same connection as we did on the driver's side. We wanna pull this green wire tight. I'm gonna go ahead and plug it in and then I'm gonna take our excess and just zip tie it back here to one of our plastic components. Now I'm gonna reinstall our tail lamp assemblies in reverse order we took them apart. Once you get that plugged in, you're gonna take our new side back here. Just kinda slide it in the back where there's enough room. And then we'll work that tail lamp back in and re-install our wing nut. We're now gonna grab our provided self tapping screw. We're gonna ground our ground wire just behind our hitch. You do wanna make sure that there's no important components behind there. And we'll get that started. You don't wanna over-tighten that. You just wanna make sure that that ground is not gonna move. And we can push that wire up and zip tie it to our other wiring. Then we are gonna have a good amount of extra four-pole wiring. So we're just gonna zip tie that up to our hitch, route it down through our underbody panel. We just wanna make sure that we leave enough attached to our hitch. That way, whenever we do need it you can get this cap off of here. We have plenty of extra wire to get everything plugged in. We're now gonna grab the other end of our power wire and we're gonna strip that back. We're gonna take our other provided heat shrink butt connector. And then we'll just crimp that on to our power wire. Now we wanna grab our provided fuse holder. We're gonna take our wire like so, try to get it as straight as possible. And then we're gonna grab the snips. Snip it close to the middle. We're actually gonna be stripping back both ends. One is gonna go to that butt connector. And this other side is gonna go to a ring terminal. We're gonna take this end, we'll find that butt connector, slide it in and crimp it down. You don't wanna forget to come back and heat shrink this butt connector. And then I'm gonna grab a 10 millimeter socket, remove that nut. Then take that ring terminal, slide it over and re-install our screw. We're gonna take our fuse holder, we'll open that up, grab our fuse, insert that there. We're now ready to test out our wiring. We'll start with our brakes, do our left turn and our right turn and our running lights. And now we're gonna clean up our wiring. So I'll just zip tie it to this factory wiring. Then we need to make sure to come back and add some black silicone to that grommet, that way we keep those outside elements outside. We now wanna re-install all the components we removed in the reverse order we took them apart. With our fascia re-installed we just wanna get some dielectric grease to add to our four-pole. Once we get that on there, we're good to go. And that's gonna do it for our look at and our installation of Tekonsha's T- One vehicle wiring harness with a four flat on our 2018 Jaguar F-PACE..


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Info for this part was:

Employee Joshua S
Video Edited:
Joshua S
Employee Chris R
Video by:
Chris R
Employee Clayton O
Test Fit:
Clayton O

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