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Roadmaster Diode 7 to 6 Wire Coil Kit Installation - 2018 Jeep Grand Cherokee

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How to Install the Roadmaster Diode 7 to 6 Wire Coil Kit on a 2018 Jeep Grand Cherokee


Today on our 2018 Jeep Grand Cherokee we're going to be installing Roadmaster's diode wiring kit, part number RM-15267. Our diode wiring kit runs from the rear tail lamp assemblies up to our six pole connector here. And here you can see in our motor home we have our left turn signal on, and here you can see when we activate the lights in our motor home it also matches on our Jeep.We've got everything else that we'll need to get our flat tow for our vehicle behind our motor home set up. We've got our tow bars, which is the connection point between your baseplate and your motor home's hitch, we have our breaking system, we have our wiring, which gives us all of our stop, turn, and tail lamp signals from our motor home to our vehicle. And to be able to connect our tow bar to our base plate we're using Roadmaster's quick disconnect kit.Your baseplate is going to be your interface that allows a connection to your motor home. This is where your tow bars will attach.

It'll give you a secure point that'll allow your vehicle to be pulled behind your motor home. On each side there'll be a location for your safety chain and a connection point. The sleeves here for your connection point can be disconnected by pulling the pin, rotating it, and pulling it out. And that'll just give you a cleaner look when you're not using your vehicle for flat tow.We'll begin our installation at the rear of the vehicle. You need to open your lift gate.

We're going to remove both the push pins on each of the tail light assemblies. We'll use our trim panel remover tool to get behind the center pin. We'll pop that out and then you can pop out the rest of the pin behind it. We'll do that for both pins on this side and on the other side. Now the tail light assembly will just come loose.

You just need to pull it rearward. I recommend using a trim panel tool to go between the tail light lens and the body, and just help pry it backwards.Now on both the large connector and the one in the middle we're going to strip back the sheathing that covers up our wiring here so we can access the wires to make our connection. We're just going to use a razor knife to cut that. Now we've got it stripped back on both sides, we're going to cut all the wires that aren't black. So, we're going to leave that black wire there, we're going to cut this one, and we're going to cut this one here.So we've cut a white wire, and a white and gray.

We'll strip back each end of the wires we just cut. Now we'll prepare our wiring. So we want to separate the green wire. We're going to go ahead and snip that with our cutters. We're just going to pull this green wire back, and we just need to pull it back far enough to where it won't run up with the rest of our wires. So that's about okay there. It's about two or three feet.Now, in order to get that wire up here to our assembly so we can make our connections, we're going to use a piece of airline tube with a fish wire. We're just poking this down the opening here until it comes out the bottom. Might be necessary after you poke it down so far, to reach down underneath and continue pulling it through. We're going to tape our yellow, brown, and white wire to that fish wire. I'm just using some electrical tape. We'll then pull our fish wire up and we'll just separate our wiring from it. Then we'll take our wiring and we're going to separate each of the colors, and then we'll strip those back.Now take off the blue spade terminals from one of our diodes, and on the other diode that has the yellow, we're going to take off all of its terminals as well. Take the brown and white wire, and we're gonna twist those together, and we're gonna connect those to the yellow terminal. Then we'll crimp it down. Each other wire that we strip back is now gonna get a blue spade terminal crimped on it.Now we'll take our diodes and connect them back into our wiring. The out is gonna go to the bulb side. The other end of the wire, where we cut it, will go to the end, and since this is our turn signal bulb, this larger connector here, that will get the yellow wire. We'll slide that on the other end. Then we'll take our other diode. Out will, again, go towards the bulb, the other end of the wire to the end, and our yellow spade terminal, which is our tail lamps, will go to the other end.Now we can take the sticky pads on our diodes, you can if you'd like, you can stick them to the inside wall where our tail lamp came out of. I usually just like to stick them together because it's very difficult to find a spot where you can stick it on the wall where the tail lamp will fit, if there is even one. So this way, you've got the option to maneuver them around, making it easier to get your tail lamp assembly back installed. Tweak it around a little bit until you find a spot where those wires will fit.We'll now wrap all of our wiring across the backside of our vehicle, underneath. I'm just gonna take it up, we're going to go over the beam here, so that way we stay away from our exhaust, and just make our way all the way across. Our green wire, which is our passenger side tail lamp assembly, will need to be routed over to the passenger side tail light area. And we're also gonna use the white wire to get our tail light circuit over to the other side. We're just gonna eyeball that up, take our wire here. In order to get it up into that tail light area we're gonna need it to be about this long, so we'll take our cutters, we'll snip the white wire, and we'll begin separating it. This is the side of the white wire that's connected to our driver's side over there. It's for using it as a jumper to get our tail light signal across to the other side.Now on our passenger side we made very similar connections. The green wire is your passenger side turn lamp signal. So that'll connect in with the diode that goes to our white and green wire for our larger bulb. Our smaller socket here has the white and orange wire, which will connect to our white wire that we used as a jumper for our tail lamps.Now we've got all of our diodes installed, we can reinstall our tail light assemblies, and then we'll route our wiring up to the front. We routed our wiring going forward following our factory wiring. When you route your wiring, you want to make sure you avoid any excessively hot or moving objects, so we follow our factory wiring wherever possible. We go up above our rear suspension, we come out in front of the rear suspension here, go alongside of our fuel tank. Here we meet our factory wiring again and we just follow that all the way up.Once you get to this point here, your wiring is going to go up behind the fender liner. I did find it easier to use the inaudible 00:08:00 wire starting at the bottom and pushing it up through a whole. If you stick your hand up in here, you'll feel a hole, a little grommet, where you can poke the wire through. It's difficult to see, but it's easy to feel. Our wiring came up here. We poked it through the small hole to get it into our engine compartment. We ran it down, following the factory wiring still, up alongside our passenger side headlight, and then across our factory wiring here, behind our bumper beam, and then we go down toward our connection where our six hole plug is gonna be.Now when you are routing this, I do recommend leaving a little bit of slack on your passenger side up over here, because if you're installing a braking system you're gonna need to tap into these wires. So having just a little bit of slack will make that job a lot easier. Additionally, if you put a baseplate on it recently, this is the perfect time to install your wiring, because it'll make it much easier to route this wiring while you have your fascia off from your baseplate installation.We'll cut our white wire just like we did in the back. So we're gonna snip it in half and then we're going to separate it out from the rest of the wiring. Now we only need the wiring that goes to the front of the vehicle now. So there is gonna be some white wire that's along the middle of the vehicle that's just gonna be there. It doesn't connect to anything, so it's okay, because it's nice and attached to the rest of our wiring so it's not gonna fall down or cause you any issues down the road. So we're gonna pull this wiring through here.And this white wiring is our ground wire. There's a ground stud located right here that we're gonna be attaching this to. So we're gonna strip back our white wire, and then we'll connect the blue ring terminal that comes in our kit onto the white wire. We'll then use a 13 millimeter wrench to remove that ground stud. You could also use a socket. A wrench is a little bit easier to fit in there. We'll slide our ring terminal on, and then just reinstall that jumper stud.So now we'll take our wiring here at our connection point. I always like to leave a little excess just in case you need to make any future repairs. And we're gonna cut off what we don't need. We'll now separate out each wire color. We'll strip back each one. Take your six pole connector, we're gonna take the rubber boot off the back. We'll slide that on first. And now we'll connect those to our six pole connector. We're gonna need the one labeled "GD", that's ground, for our white wire; "TM", which is your tail lights, which is the brown wire; "RT", which is right turn, which is your green wire; and "LT", which is left turn, which is the yellow wire. We're just gonna poke those in and then screw them back down.Now that we've made all of our connections, we'll use some dielectric grease to seal up the back. This will keep out any moisture and help prevent corrosion. Then you can slide your seal on. I like to use some electrical tape. We'll now secure it to the baseplate using self-tapping screws. These self-tapping screws came with our baseplate.We'll now use our inaudible 00:11:53 cable that comes in our kit, and we're gonna plug it in and test everything out. The other end you can plug into your motor home, or if you have a trailer tester, you can plug it into there. Now operate all of your signals and make sure that they work on your vehicle. You want to make sure you have your left turn signal, right turn signal, tail lamps, and brake lamps. If everything's working properly, you're ready to wrap it up and hit the road.And that completes our installation of Roadmaster's diode wiring kit on our 2018 Jeep Grand Cherokee.


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