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Curt T-Connector Vehicle Wiring Harness Installation - 2019 Jeep Wrangler Unlimited

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How to Install the Curt T-Connector Vehicle Wiring Harness on a 2019 Jeep Wrangler Unlimited


Rob: Rob here at etrailer.com and today are you taking a look at the Curt T-connector vehicle wiring harness with a four pole flat trailer connector on our 2019 Jeep Wrangler Unlimited. Our wiring's going to give us a four pole connector to have all the required lights to get down the road legally and safely. It's going to give us our tail lights, our stop lights, and our turn signals. So whenever we're towing a trailer down the road, we can rest assured that everyone around us is going to know what's going on and we can prevent getting hit behind us because our trailers will have lights and it'll be legal.I do want to mention we have ours mounted on a four pole bracket, also using a short bracket. Those are not going to come with the kit, but I do always recommend mounting your wiring at the back of your hitch so it's really secure. And it's just an easy way to access it whenever we want to tow.Our wiring is going to be an extremely simple installation, we're not going to have to cut or splice into our factory wires.

It's just going to have a simple T-connector that's going to plug in line with our tail lights on each side. Now it's also going to protect our Jeep in case there is a problem that arises on the trailer end. It's not going to backfeed and cause any kind of electrical issues. Not to mention our wiring harness is going to have a fuse holder, so it's not going to overload our taillight circuits because it's going to have a dedicated power source right at the battery with a fuse holder in place.Now that we've see what the wiring looks like in the end and gone over some of the features, let's walk through the install together. To begin our installation, we want to open up our rear hatch and we want to come to the inside right on the outer edge.

If we look in here, we're going to have this square cover that's going to be covering up the access hole to reach the bolts that are holding our tail lights in place.We can grab a flat head screwdriver or whatever you can to get underneath it and we're going to pop that cover out. When we look inside, we'll see there's a white fastener in there. We need to pull that out so we get our taillight out. So we'll grab a 10 millimeter socket and pull it out.Pull the fastener out around and we can pull our taillight assembly out. Now you kind of want to pull straight back.

You don't want to twist it too much because we are going to have some alignment pins here and we don't want those to break. But once we have it out, we'll come to our plug, we're going to pull that red tab down in a way, and we'll press down on the black tab that's right in front of it.We'll be able to pull our connector out, and over here on the driver's side we are going to have a clip holding our wiring to the taillight itself. So you just want to pull that out so we can set the tail light aside and not worry about it getting damaged.Now that this one's removed, we're going to take out the passenger side the exact same way on the inside with that plastic fastener. We want to grab our new harness now and we're going to take the end that matches up, we're going to plug that in, and we'll lock the tab down, and the other end will plug into our tail light.But before we put our tail light back in place, we want to grab the rest of our harness and we're going to be feeding it down so it can go down underneath the bumper. So we want to send our green wire and our four pole wire down so we can pull all that slack out underneath the bumper.

And if you look inside, you can actually see a spot a little bit further in the taillight housing where you can see the ground and actually get to it. So don't worry about staying real close. You can move back a little bit right by the filler neck here. And we can sneak our wires down back there.And we should have two more wires coming off of the black converter box. One of them will be a black wire with a stripped end on it. This is going to be our power source. We'll have a white wire with a ring terminal. This is going to be our ground wire. I'm going to find a nice spot that's flat and we can use the self tapping screw to secure this to. And if we look inside our taillight housing area, we'll have this support beam right here. It's pretty thick, solid metal, and it's not going to be on the exterior or the interior of our jeep. So we don't have to worry about anything on the back side. So that'd be a really good spot to ground it out and we've got plenty of wire to reach.So I'm going to take a quarter inch bit driver and I'm going to drive the self tapping screw directly into the metal. Whenever you tighten it up, you want to make sure that it is secure. That ring terminal is not going to be moving around, but you don't want to strip it out to where it's not going to tighten up. Now our black wire, like I said before, is going to have to go to a power source, which we're going to go to our battery. But clearly this length of wire is not going to reach. So I'm going to take the butt connector out of our kit, slide it over the end of our wire, and we'll crimp it in place.Now Curt is going to provide us with a plenty of length of wire to run up to the battery, so we'll strip back the end of this and we'll crimp it into the other end of our butt connector. Now since this is going to be behind the tail light and potentially towards the back of the tire here, I'm going to take some electrical tape and I'm going to wrap my connector up. That way, hopefully it prevents any kind of moisture or debris from getting inside and causing corrosion buildup.Now we're going to drop this wire down with our green wire and our four pole wire so they can all meet up right underneath the bumper. Now we need to find a spot that we can mount our converter box. Now we do have the option, we can use a zip tie, self tapping screw, and use the eyelet on top.Or we can use the provided double sided tape and stick it to somewhere flat. That's what we're going to do. We're going to take the backing off one side. I'm going to stick it directly to the back of the box. Press down, make sure it adheres well. I'm going to remove the other side of our backing, and if we look inside our housing, there's going to be a really nice flat spot on the bottom. We can actually just reach in, make sure the box sticks really well, and just press it down right there.So we have all of our connections made over here behind the driver's side taillight, so we can go ahead and plug that back in. Don't forget to press in that locking tab. We'll just line up the alignment pins and put the taillight back in place. Tighten up our fastener and we can put that cover back in place, as well.Now we want to route our green wire over to the passenger side and up through the taillight housing, and it's going to plug in the same way as the driver's side. I just do want to mention since we're going to have our exhaust back here, you want to stay away from any major heat sources that might damage the wire.I ran my black wire, my four pole wire, and my green wire underneath the heat shield here. If you need a little bit more room, you can take the nuts out. Just run it behind it and put them back. I stopped my four-pole right about my hitch because we're going to be mounting ours next to our hitch with these brackets. Now if you don't have brackets, that's fine. You can use the dust cap cover to attach it to your safety chain loops.But I always recommend using a bracket because it will be nice and secure and it'll be ready for you when you tow. And these are going to be sold separately, but you can find them here at etrailer.com. For my green wire and my black wire, I ran across. My green wire, I just took the same path, went up to my tail lights.But here I have my black wire. This is going to have to run up to the battery. So we're going to run it along down the frame until we get to the firewall and we can reach up to the battery. However, again, I do want to mention you want to stay away from heat sources like the exhaust or any moving components like the steering, suspension, for the driveshaft because we don't want anything to damage this wire because it is going to get constant 12 volt power.So I'm going to go ahead and route this and I'll show you how I got it there. So I routed my power wire towards the back. I went over all of my supports and my sway bar, and once I got to the fuel tank, I went over this support, started routing it underneath all these brackets, zip tying it along the way as I go. It's going to be kind of hard to see because everything is actually behind the fuel tank cover.But then my wire is going to come back out right in front of the fuel tank and it stops right here. I went ahead and went up to the engine bay and I dropped an airline tube down right next to my battery. That's going to make it easier for me to get my wire up because we can take some electrical tape, tape it to it, go back up top and pull it through.Now I dropped my airline tube right down to the firewall on the passenger side, because our battery's going to be right in front of that. So I can take my airline tube and start pulling all the slack up. And it's not a bad idea to take a peak underneath the Jeep to make sure a lot of it didn't get stuck and it's not going to get caught going down the road. So we'll pull all the slack up. What I like to do is I like to find some existing wiring and I'll take a zip tie and anchor it off so I don't have to worry about it falling back down.Now we don't need all this wire, so I'm going to go ahead and trim off the excess. And then we're going to take our wire strippers and we'll strip back the end of our wire. We're going to grab another butt connector from our kit and crimp it in place. Once that's crimped in place, we want to grab our fuse holder. We'll strip back the end of the wire. It's already pre-stripped, should be able to pull it off. We'll take the bare wire and put it into the other end of our butt connector and crimp it down.On the other end of our fuse holder, we're going to put a ring terminal. Same thing. We'll just take the insulation off the end and we'll crimp it onto the end of our wire. This is going to need to get hooked to the positive post in our battery. So if we come right here and we lift up the cover, we'll see that we're going to have an open spot right here that we'll be able to hook it up too.So you want to grab a 12 millimeter socket and we'll pull the nut out. Once the nut's removed, take our ring terminal, slide it over the end of the post, then we can reinstall the nut. Now if you'd like, just so that the cover can go back on easily and still look nice, is run your wire through the back of the cover and then we can attach it to the ring terminal. That way we won't have to cut anything or worry about the cover not going back on right.We'll run our nut back down. Make sure it's secure. Put our cover back in place. And we can put our fuse inside the fuse holder. And once you have your fuse in place, now would be a good time to clean up any wires. If you are going to mount your four pole, you can mount that wherever you'd like. Just take some time trying to clean up your install.If you are going to be using a four pole bracket to mount it, what you're going to do is you're going to come from the backside. You kind of want to just work the four pole connector in until those two tabs and get past the end here. You do want to make sure you put your dust cover in first, that way you don't have any risk of losing it because it'll actually be mounting it onto the back of the bracket so it has nowhere to go.The final step of our installation is going to be testing our wiring to make sure all the circuits work properly. So I'm going to turn on my headlights, we can see my taillight circuit's working. The left turn signal, the right turn signal, and my brakes.All we have left to do now is hook up to our trailer and hit the road. But that'll finish up your look at the Curt T-connector vehicle wiring harness with a four pole flat trailer connector on our 2019 Jeep Wrangler Unlimited.


Questions and Comments about this Video


C.j. S.
Best, clearest, most concise instructional video I've watched.

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