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Roadmaster Tow Bar Wiring Kit Installation - 2018 Jeep JL Wrangler Unlimited

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How to Install the Roadmaster Tow Bar Wiring Kit on a 2018 Jeep JL Wrangler Unlimited


Hey everyone, how's it going Today, we're gonna be going over and showing you how to install the Roadmaster diode seven wire to six wire wiring kit here on our 2018 Jeep Wrangler Unlimited. So, our Roadmaster seven wire to six wire wiring kit's here. We're gonna have a couple different options, as far as the umbilical goes. And the reason for this, it really comes down to what tow bar you have. So, we have the straight cord here. And you'd want to use a straight cord if you had a tow bar with built-in channels that allow you to run the cord through the channels on the tow bar.

It's sort of a built-in method to prevent them from dragging around, getting tangled. It makes everything a nice complete package. So a lot of the Roadmaster all-terrain tow bars have those integrated channels. So if that's what you have, you'd want to go ahead and pick up the kit with the straight umbilical. Now over here, we have a hybrid.

The side that goes, that attaches to the tow bar, that goes to the towed vehicle, that's gonna be a straight coil, just like the one over here. But for the RV side, the last couple feet of our wiring here has a coiled end, therefore, it's gonna do a little bit better job here at the motor home side, to help prevent any tangling, and to prevent the coil from dragging the ground. And then, last but not least, we have our completely coiled umbilical cord. So if you don't have a tow bar with integrated channels, you could still use those other two options, but the completely coiled one would probably be a little bit better for you, because, again, you don't have to worry about it dragging on the ground. And since you don't have any channels in your tow bar, you will need something to take up that extra slack.

So, our diode wiring kit, in our most basic form, it's gonna transfer the signals from our motor home to our towed vehicle. Now, the reason we need to do this is, it's gonna allow us to remain up to code for all local, state rules and regulations. So while we're in our motor home and we're signaling to others what we're gonna be doing, we're obviously not gonna be able to see the tail lights on the motor home, or at least not very well for those behind you. Therefore, we need to transfer those signals over here to our towed vehicle, so others on the road can see what we're doing. So, with this kit here, we're gonna get all of our basic signals and lighting.

We're gonna get the tail lights, as well as the stop and turn signal circuits for both the driver and passenger side. So, this kit does utilize four diodes. And what the diodes essentially do is, they're gonna install in-line between the factory tail lights and the factory tail light circuits. We're then gonna T into that with our motor home signal. So, in order to prevent any lighting issues from the motor home from transpiring over here on the Jeep, we don't want to damage the electricals on the Jeep, therefore, the diodes are gonna stop the backfeed of electricity, so the signal can only travel one way. So the first step of our installation, we're gonna take our bonded four-pole harness here, and we're gonna give ourselves a little bit of extra to work with. So, give yourself about a foot or so of this wiring harness, tied to the front of our base plate kit here. If you don't already have your base plate kit installed, you can go ahead and just wrap it around, coil it up here. And then what we did is we actually drilled a hole using a step drill bit through this plastic skid shield here, 'cause that's what we used as a pass-through to come back behind the vehicle here. And now we're just gonna work our way to the rear tail lights here, securing our wiring harness, most likely through the frame. We'll show you that next. So here, we have our bonded four-pole coming out behind that skid shield here. In your kit, you're gonna get some wire loom here. I suggest using that on this first couple feet of our harness here. And then we just simply have it ran up here. I have a couple zip ties securing it to the power steering lines. These are pretty stable, so they shouldn't be moving around too much. And then I came up and over the axle here. And now we have it coming out just on top of this bracket here for our brake lines. I'm gonna use a couple zip ties and secure it to this so it doesn't drop down, or get inside our braking assemblies, or mess with the wheels or anything. And then we're actually gonna have an access hole inside the frame here. We're gonna feed our wire through that. We're gonna run it all the way to the rear, near our tail lights. So now that we have our bonded four-pole harness here at the rear of the vehicle, the next thing we need to do is to actually remove the tail lights, so we can access the wires behind them. So we're gonna come in directly behind our tail lights inside the vehicle here. We're gonna see these little plastic covers here. We need to go ahead and remove this with a flathead screwdriver. And then it's gonna reveal a plastic nut here, which we'll take out with a 10-millimeter socket. And here's what that looks like. So with our fastener removed, we should just be able to pull straight out on our tail light to remove it. And we're gonna go ahead and remove this connector. It's gonna be that red safety tab. Gonna press that back, then we're gonna depress it and pull out. So, once you get the tail lights free, we're gonna see our connectors here, and you're gonna have some fabric tape here, going all the way from back here, where it enters the cab, to the end of our connector. So what you need to do is, you're gonna actually be taking some sort of razor blade, and we're just gonna be piercing that fabric tape so we can spread it back far enough that we can install our diodes. Now, the fabric tape is a little bit of a pain in the butt here. You just need to make sure that while we're cutting this, that we don't pierce our wires. So you need to be careful about it. It is gonna take you a little bit of time, but this is about how much we need to install our diodes. So we've got our wires pulled up through an access hole in the bottom of this tail light pocket here. It was actually, we had to go up and over the frame, and it's just actually a little bit on the other side of where we came out of the access hole in the frame. You'll have to get down on the ground and reach up and push your wires through that hole there. It wasn't actually too hard. Now, depending on which side of the frame we ran our wires on, we actually came down the passenger side, therefore, we're gonna be separating out our yellow wire here before we pull up these other three wires here into the tail light pocket on the passenger side. The next step would be to go ahead and test all of our wires here. That way we know which one is for the stop/turn signal circuit, and which one is for the running light circuit. But we've already done the hard work for you, and we're gonna tell you now. This lime green wire here is gonna be for the stop/turn signal circuit, and this white wire here with an orange stripe, it may look a little bit red, that's gonna be for the running light circuit. So what we're gonna do now is, we're gonna cut our green wire about halfway in between where the harness comes out and the end of our pigtail here. Want to give ourselves enough room to work. You're gonna cut that, you're gonna strip off some of the jacket, and then we're gonna take one of our diodes here, we're gonna be taking the one with the blue connectors. We're going to take off one of these spade terminals, and I'm gonna crimp that on to our wire. Make sure you get a good crimp on here. I always like to just jiggle 'em a little bit too after it, to make sure it is on there secure. I'm gonna do the same thing for this other end of the green wire. Now I'm gonna take the green wire here that came from our bonded four-pole, I'm gonna cut off the excess. And again, I am going to crimp on another spade terminal. Now we'll go ahead and connect our first diode. The outside on the diode is gonna go to the pigtail, or singular wire. And then it doesn't matter which one we put these in. Just go ahead and connect 'em. Now we're gonna take our diode with our two blue connectors and our yellow one, and we're gonna do the same process here for the running light circuit, which is the white/orange wire. So the only thing we're gonna be doing different for this other diode here, we're gonna take the yellow connector, which is the only different one in the kit here, and we're gonna have the running light wire that came down, this was actually the one that went to the front of the vehicle, then we're gonna take the extra brown wire that we cut off, and we're gonna tie these two together. Just gonna spin those two strands around, then I'm gonna crimp on this yellow larger butt connector here. And the reason we did that is, this is gonna be our jumper wire that we're gonna use to transfer the running light circuit over to the driver's side. We'll just go ahead and make our connections now. So again, the outside goes to the connector end. And then I'm gonna take this brown wire here, I'm gonna feed it back down through the hole that we drew our wires up through earlier. So now finally, we're gonna have our white wire here, which is for our ground, I'm gonna go ahead and cut the excess off, and I am gonna crimp on the ring terminal that came in our kit. We're also gonna get a self-tapping screw, which we can use to ground it to the body inside here of the tail light pocket. Now what I'm gonna do is, I'm gonna go ahead and attach our diodes together, so you don't have to worry about 'em flopping around. Just peel the sticky back off, and stick them together like so. Now we can reinstall our tail light. I'm gonna run the brown jumper wire, along with our yellow wire, down underneath here over to the driver's side. We'll meet you over there. There's gonna be the same hole, that little tail light access hole at the back here, that we can use for entry into the tail light pocket here. It was the same as over on the passenger side. Now keep in mind, you may or may not need to extend your yellow and brown wires. Just depends on how you ran your wires. So we have 'em down here, and we basically just repeated the same process that we did on the passenger side here, over on the driver's side. The only difference is, we don't have to run that jumper wire for the brown because the jumper wire is the one we ran over here. One note though, for the harness here, the yellow wire is gonna be responsible for the left stop/turn, and then the white wire with the gray stripe is gonna be responsible for the running light circuit. And now we'll just reinstall our tail light for this side as well. I would keep in mind, if you guys haven't done this before and you're not super confident with your connections in your wiring, you can actually leave the tail lights off until we test everything. I've did this quite a few times though, so I'm pretty confident we got everything correct. So at this point, I'm just gonna go ahead and reinstall the tail lights. So now, with all of our diodes installed, we're gonna come back to the front of the vehicle, we're gonna be installing the trailer connector. So what we're gonna do now is, we got some extra wire here, we've made sure of that, we're gonna go ahead and cut some of that excess off, and then we're gonna begin separating each of these. So now we will begin stripping off for each of our four wires here. So now that we have our wires stripped, we're gonna go ahead and take our boot here for our trailer connector, we'll go ahead and slide that on. So now we're gonna look at the back of our connector here. We're gonna take a tiny Phillips-head screwdriver. You can see they're actually gonna be labeled. We only need to unscrew a couple of these. You don't want to unscrew these screws all the way, 'cause if you lose 'em, they are pretty small. So we're gonna do the first one is TM. It's gonna be for the tail light circuit. Loosen that up. Take our brown wire, insert that, and then go ahead and tighten down the screw. The next one we're gonna do is gonna be GD for ground. The next one we have LT, left turn. You should see RT, that's for right turn, and that'll be our green wire. And now what we're gonna do before we actually install the trailer connector is we're gonna test everything out. So we got our tester box here, which we're gonna use to test the lights. However, if you have your motor home, you could obviously use that as well, assuming everything is working there. So here we have our tail lights, our left turn, our brake lights, and then finally, our right turn. So there we go. Now we know everything's hooked up and working correctly. So now, we're gonna take some silicone here, and I'm gonna ahead and cover all of these terminals here, so we don't have to worry about water getting inside, corroding, and causing any lighting issues. So this step isn't required, but I do highly recommend it. We'll take our boot here, and we'll slide that back over. Now we can go ahead and attach it here. So, luckily for us, our base plate kit here has these two tabs, which we can mount our trailer connector to. Depending on what base plate kit you have, you may need to use the other bracket that comes in our kit here. It attaches to these two holes here. Then it has a flange up top. You could just drill into the bottom of this bumper here. And that's gonna do it today for our look at installation of the Roadmaster seven wire to six wire diode wiring kit, here on our 2018 Jeep Wrangler Unlimited..


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