CurtT-Connector Vehicle Wiring Harness Installation - 2018 Jeep JL Wrangler

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How to Install a CurtT-Connector Vehicle Wiring Harness on a 2018 Jeep JL Wrangler

Shane: Hi, I'm Shane with Today we're going to be taking a look at, I'm going to walk you through the installation on the Curt 4-Pole Wiring Harness on your 2018 Jeep JL Wrangler. This wiring harness is going to allow you to transfer all your light signals to your trailer while you're legal and safe while pulling that trailer down the road.It's going to give you three amps per circuit for your stop and turn signals. Six amps per circuit for your taillights. It's going to come with a nice dust cap. It's going to help protect your connections.

Keep any dirt and debris from getting on them. Keep them from corroding.Our dust cap can also be used as a holder, when we're not using our wiring, to help keep it from dragging the ground. Another option is to add a no-drill mounting bracket to your frame rail. It's going to give your 4-pole wiring a more permanent mounting location.One of the nice things about this wiring kit is the converter box. What the converter box does is it's going to protect your factory wiring in your Jeep from any back feed from your trailer, if your trailer has a wiring issue.

That means if your trailer wiring has a short, that short feeds up into this wiring harness. That converter box is going to stop that short from getting into your factory wiring. Again, protecting it from any damage.Now as far as the installation goes, it's a pretty straight forward installation. It's going to connect to factory wiring behind each taillight. The only thing you're going to have to do it run a power wire up to the battery.Now that we've gone over some of the features, let's show you how to get them installed.

We're going to start . There's a small panel on the inside here. Take a plastic trim handle tool or a screwdriver. We're going to pop this panel up. There's going to be a plastic nut right inside here.

Take a 10 millimeter socket and we're going to remove that nut. Actually what it is, is it's more like a spring loaded bolt that is holding our taillight in place. We're going to do the same thing on the other side.Once you get that out, we're going to take our light, we're going to slide it out like that. We're going to take this red tab, pull it up. Push down on the black. Just like that. We're going to take our wiring harness. We're going to match up our plugs. Yellow and brown, that's going to be our driver's side. Take our box . In your kit you're going to get some two sided sticky tape. We have plenty of room right inside this pocket to mount this. Go head and pull this off. I'm just going to mount it right on the bottom down here. Straight down with it.We're going to take our 4-pole wire. We're going to feed it right down. You see that opening there, we're going to feed it right down through there. Same thing with our passenger side, which is our green wire. Take our self-tapping screw for our ground wire. We're going to make sure we're grounding on metal, not on plastic. I'm just going to go straight across here. Just like that.Now we're going to take our power wire, that we're going to be running up to the front of the vehicle to the battery. I'm just going to go ahead and leave a little bit out just like this. The bundle I'm going to take and I'm going to pass down the same way I did my other wires. I'm going to strip back the ends. Add on the butt connector. We're going to attach it to the black wire coming off our module. Then I can reinstall our taillight.Now to run our green wire over to our passenger side, you want to make sure you're staying away from our muffler. The easiest way that I know is, I went over the top of my frame rail. You have two nuts right here. 11 millimeter socket. Pull those down. Take your wire and slide it up above that heat shield. Run it across. Over top of your frame rail over here. You're going to push it. It's going to have the same pocket on this side. Take your plugs, run it up, tuck it in that pocket. Then you hook it up to the back of your passenger side taillight same way you did on your driver's side.Power wire that will be going to the front of the vehicle. The way I ran it is through the same hole I did my 4-pole. Went up over the top. Make sure you stay away from anything hot or moving. I Zip Tied it right to this line. Went over top of my spring mount. Came down, went into my frame rail because my exhaust runs over here on this side. It went through my frame rail, all the way up, to right behind my driver's tire. The way I got it through, use something a little bit stiff. Airline tube works really well. Jeep frame rails have a lot of holes in the so it's easy to get that. I just feed it through and work it up to the front. I'll go up top and I'll pull it up behind my brake booster.Right behind the bracket on my firewall there. Right over to my passenger side where my battery is. I Zip Tied it here. I Zip Tied it here to make sure my wire stays taught, doesn't fall down on top of my engine. Now we'll make the connection for the positive side of the battery.I'm going to go ahead and cut our wire to size. We're going to take our fuse holder and then strip back both sides. The shrink butt connector doesn't come in your kit. I would suggest putting this on because this connection is going to be outside of the vehicle. It's going to really help that connection. Keep it from corroding later on. Help keep any moisture or anything like that off of it. Let's strip back this end. Heat up your butt connector. Take our ring terminal add it on the other end. Half inch socket, we're going to remove this nut. Take that off. Reinstall your nut. Then add your fuse.Now we'll test out our wiring using part number I26. Left turn, right turn, brake lights, running lights. Once you've tested your wiring, everything's working correctly, you're ready to go.Again, I'm Shane with I hope this video has helped you, whether you're still in the purchasing process or installing your Curt Wiring on your 2016 JL Wrangler.

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Info for this part was:

Installed by:
Jeff D
Video Edited:
Jacob T
Video Edited:
Dustin K
Video Edited:
Chris R
Test Fit:
Shane H
Test Fit:
Robert C
Test Fit:
Conner L
Video by:
Jonathan Y
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Michael B
Video by:
Aidan B

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