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Roadmaster 4-Diode Universal Wiring Kit Installation - 2020 Chevrolet Silverado 2500

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How to Install the Roadmaster 4-Diode Universal Wiring Kit on a 2020 Chevrolet Silverado 2500


Hey everyone, how's it going Today, we're gonna be going over the Roadmaster Diode wiring harness here on a 2020 Chevrolet Silverado 2500. So this is an all inclusive kit. It has everything that we need to pretty much control the lights on the vehicle from the motorhome here. So we're gonna get everything that installs on the truck. And we're also gonna get an umbilical cord. Now, a couple different things I'd like to point out.

Is number one, there's quite a few different options for this kit here, depending on what style umbilical cord you need. The full coil, which is what we see here. We have the hybrid, which has a coil at the trailer connector side that plugs into the motorhome. And then the other side that goes to the vehicle is nice and flat. And then we have a full straight one.

That means there's no coil whatsoever. So in order to choose the correct one, it's really gonna come down to what kind of tow bar you have. So if you have a tow bar like this Roadmaster one here, the Nighthawk All Terrain or the BlackHawk All Terrain, it actually has channels built into the tow bar that you can run your electrical cord through. So if you have one of those tow bars, that have these channels you're gonna wanna opt for either the completely straight cable or the hybrid cable. Those are both gonna work well with this particular tow bar.

If you have another tow bar that doesn't have those integrated channels, that's when you're gonna opt for the coil design. And basically all the coil design is doing is making sure that you don't have extra wire dragging on the ground, causing damage to your umbilical. So this wiring harness here is gonna be a required part of your flat tow setup. Simply put it's gonna transfer the lights from the motorhome to our towed vehicle here. So we can let other motorists out on the road know what signals we're gonna be making allowing us to arrive to our destination, safe and sound.

In addition to safety, this is also a legal requirement in every state. So there's quite a few different options for the taillight wiring systems here on your towed vehicle. But if you ask me, this diode one certainly is the best. Now a couple other common types are the magnetic base lights that just simply sit on the, usually the cab of your truck there. Since we don't have any metal on the top of the bed and then we'd run wires over the hood. And not only is that a little unsightly it's also gonna push our lights all the way up there. So it's gonna be a little bit harder to see. Another type is a bulb and socket kit. Those actually require drilling into the taillight housings which I really don't like to do. Because it's really hard to get a nice tight seal on there. So water doesn't get in. The diode ones that we're using here today are the best. And the reason for that is they're actually gonna utilize the factory taillights and the factory taillight circuit. So you don't have to worry about drilling into the taillights. It's gonna use the factory bulb there, for a nice seamless look. Now with the diodes. One people, one concern that people have is that they're worried about electrical issues with the motorhome affecting their vehicle. And thankfully, due to those diodes, you're not gonna have to worry about that because the diodes, actually what they do is, they prevent the backflow of electricity. So we don't ever have to worry about an issue on the motorhome affecting the lights on our vehicle and vice versa. Everything is gonna be nice and separated out there. So you can keep both your truck and the motorhome in tiptop working order. So the only downside of the diode wiring is that it does require splicing into the factory wires on the vehicle, but it's only two on each side. And this is a pretty minor modification definitely well worth everything else that we get here, from utilizing the factory taillights and the factory bulbs. So in regards to installation this kit is really not bad at all. It's just gonna take you a little bit of time. Cause we have to run wires from the front of the vehicle, all the way back to the rear. And then we do have to make a couple splices back there as we said earlier, but thankfully we've already went ahead and gone through all the testing. So we can tell you exactly what color wires you need to splice into, making the installation much simpler. Let's go ahead and walk you through that entire process step by step now. So the first step of our installation for the wiring, we're gonna take our bundled loom here. I'm gonna find a point on the front of the vehicle where we're gonna be mounting our trailer connector. Ours is gonna be over here on the passenger side. I'm gonna take our wire and I'm gonna tie it here, to this location giving ourselves a little bit of extra slack. And then we're gonna take some time and run it to the rear of the vehicle where our taillights are. So we're gonna go ahead and do that now. And so we've got our wire ran to the rear here. The next thing we need to do is remove our taillights. So we're gonna be taking a torx bit here, a T15 torx bit and we're gonna be removing these two screws inside here, that are holding our taillights to the body of the vehicle. And once we get those out, you should be able to pull out and away on our taillight assembly. So once we get our taillight removed, we have a couple connections we need to remove from that. First one is gonna be this little pigtail connector down here. So you're gonna take a flat head screwdriver to push this red locking tab away. Some can be, can be kind of hard to get, especially if the truck is real dusty in here but you're just gonna take some time. You can even do it with your fingernails sometimes depending on how new they are. Go ahead and just pry that away, like so. And then we're gonna to be depressing that center tab there and pulling out and away. Now we have another connection at the top here. So this is a little bayonet style fitting. You're just gonna simply turn that and pull out and away, like so, so we've got this side out. Now we just need to do that same thing over on the other side. Now, once you get your tail light out we need to remove some of the wire loom here. That's hiding the wires that we need to splice into. So it looks like there's an end of some electrical tape here and this is gonna begin peeling back. That way we can get into our circuits here. The next thing you need to do is go ahead and test all these wires. Now, thankfully, we've already done that hard part for you so you don't have to do any additional work. We'll go ahead and tell you what the colors are. So for the running light circuit it's gonna be this brown wire, not to be confused with the black wire. And then for the stop and turn signal circuit, it's gonna be the green wire. And it's gonna actually be the same on the other side as well. So these are the two circuits we're gonna be splicing into. So now once we have everything identified here, we're actually gonna take that wiring harness that we routed to the vehicle earlier. I'm gonna pull that up into the taillight pocket so we can start attaching our wires. So now we're gonna take our wires here, begin making our connection. So first things first, I'm gonna take that green and brown wire that we identified earlier. I'm gonna go ahead and cut that in the middle here. Just like that. And now I'm gonna strip some of the jacket off each of these four wires. So now we're gonna take our brown and our yellow wire. I'm gonna go ahead. I'm not gonna cut that all the way off, but I am gonna remove some of the extra slack we have. And then I'm gonna strip back some jacket, on these wires as well. So next we're gonna take these blue spade terminals here and attach them to the stop and turn signal circuit wire. So the green one coming from the plug and the green one going to the front of the vehicle and the yellow one coming from our wiring harness. So this part's pretty easy here. We just need to make sure that the outside of the diode goes to the light bulb. So we're gonna be connecting that to the spade connector, going to the plug on the vehicle. Then it doesn't matter which one of these goes where just plug one of them into one side of the input and the other one into the other. Now we're gonna work on the running light circuit. So I'm gonna take another one of our blue spade terminals, attach it to this brown wire, going to our connector. And then the other blue one is gonna go to the other brown wire, going to the front of the vehicle. And then we have our yellow spade terminal which is gonna go on this wire here. But before we attach that, we actually need to make a jumper wire to go from this side to the other. So in your kit here you're actually not gonna get enough wire just cause this truck is so large. So you are gonna need to source some of your own wire. It really doesn't matter. Just use the same gauge or larger, in order to run that jumper wire to the other side. So we're gonna go ahead and find some extra wire now, so we can attach it to this end and then run it to the other side. So here is our brown jumper wire. We're gonna connect our two brown wires. Just like so. And then we're gonna attach that yellow spade terminal. So this is the only one that's different in our kit here. And that's because we have to combine two wires. So, go ahead and crimp that on. And now we'll actually attach to our diode. So the outside goes to the one coming from our connector. These don't matter. One goes to one, one goes to the other. Can be kind of hard to get these on there now cause that yellow one's a little bit bigger. There we go. And now what I always like to do is I like to peel the backing off these. Cause those are a little sticky tape there and just attach them to one another, just like that. So next we're gonna take our white ground wire. We're gonna find a spot inside the taillight pocket to ground it here. I think up here will be good. So I'm gonna go ahead and cut off some of that extra. And then I'm going to crimp on the ring terminal that comes in your kit, just like that. Then we'll take the self tapping screw, that comes in your kit and go ahead and attach it. So now that we have our ground secure, our diodes all wrapped up. Just go ahead and take that extra green and brown wire, route it back down through the taillight pocket and over to the other side. And then we'll button up our taillight. Go ahead and reinstall it over here. We'll jump back to the other side and we'll show you where we pick up over there. So we've got our green and brown wires routed over here to the passenger side. So what we're gonna do is, we're gonna take that same green and brown wire that we identified on the other side. Gonna go ahead and cut that. Now we're just gonna go ahead and make our connections, pretty much the same as how we showed you on the other side. The only difference is we don't have a jumper wire for the running light circuit and our stop and turn signal wire is now green. So we went ahead and got this side wrapped up here. And as we said, it was the exact same on the other side from those two small differences. So go ahead and reinstall your taillight. Now, we'll head to the front of the truck. We'll temporarily install our trailer connectors so we can test everything out. So we've got our wires pulled out at the front of the vehicle here, go ahead and split them apart here. You can see we have the end split from one another and we also have some of the jacket stripped off. And as we said we're just doing this temporarily to check everything out. I'm gonna take a small Phillips head screwdriver. I'm gonna partially unscrew that ground screw it's a terminal label GD. So I can just barely slip the wire in there and then we'll tighten that screw back up. Now, the reason we don't remove the screw completely is that they're very tiny, very easy to lose. So we've got the ground one hooked up. Next thing we're gonna do is LT. That's left turn. So that's going to be yellow. And then right next to that is RT. Right turn. That's going to be green. Then finally we have our brown one, which is gonna be TM for the taillights. So now we'll go ahead and run through our signals here. We have our taillights, our left turn, our brake lights, and our right turn. So now what we're gonna do is once we have our wires hooked up, we're gonna take some gasket maker. I'm gonna fill in all these circuits here. That way, if any water does get inside there it's not gonna cause any corrosion issues. This isn't required, but I do recommend it. You can see here, we're just sort of shoving it in there between everything, just covering up all those terminals. It is kind of messy, but once we get that on there, just go ahead and slide your boot over the back of the trailer connector. Just like so, and then we'll go ahead and attach it there to the front of the vehicle. So now that we have the trailer connector installed that's gonna do it today for our look and installation of the Roadmaster diode wiring harness, here on our 2020 Chevrolet Silverado 2500..


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