Roadmaster Diode Flexo-Coil Wiring Kit Installation - 2015 Dodge Durango

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How to Install the Roadmaster Diode Flexo-Coil Wiring Kit on a 2015 Dodge Durango


Today on our 2015 Dodge Durango, we're going to be taking a look at installing the Roadmaster Diode 7-wire to 4-wire, flexo-coil wiring kit, part number RM-15247. This is what the wiring kit looks like when it's installed on a vehicle. This is about the only part you're going to see is right up here, this connector at the front, which is a full round connector. It's got this nice, spring-loaded cover, and it bolts up onto the base plate. Then the wiring runs back through your rear tail lights in order to send the power from your RV through the wiring in order to give you lights on your vehicle. You've got brake, turn, and turn lights back there when driving your RV. Something that's really nice about this is that it comes with diodes, and what those allow you to do, you mount those just inside where your tail light assemblies are. Those are there in order to help isolate the power coming through this system from your vehicle's electrical system.

Why that's nice is because that's going to keep any power from back-feeding into your vehicle's electrical system. This one's going to work really well for you if you're looking just to be able to have your lights on your vehicle behind your RV. It's going to help provide you with safe towing so that people know that your vehicle's back there when traveling. Now let's show you how to install this wiring system on your vehicle. First thing we'll do is run our wire that's going to run back for our tail lights. I routed it up over the front of the frame rail there.

Then coming up into the hood right under here, keeping it tucked away up around here. I ran it up here just so that in case any modifications to the system ever need to be made in the future, you can have a little bit of access to it. I took it and ran it down behind the heat shield for the exhaust to keep it safe from the heat. Here's one of the 4-pole wiring comes out beneath that heat shield. We'll take it, I'm going to route it right behind this inner fender here. We're just going to run it back.

We're going to follow wiring that's already existing. I secured it to the plastic covering for that wiring. I'm going to keep following it all the way back with that wiring along the side of the gas tank and then up and over the rear suspension, continuing to run along other wires, and then routing it here over the rear AC line and bringing it up right along the inside a spare tire carrier. Then from there, we can take it up and take it to our tail lights in order to wire it in. Once we've got our wire routed to the back. We're going to need to pop out our tail lights.

In order to do that, we take these and pop these out of here. It should just pull out the back. There we go. Right now, we'll take our connector off that comes in here, set our tail light inside, and repeat the same process on the other side. Now we're going to have to install our diodes. In order to do that, we need to make sure we know which wire goes to which. On the passenger side, the blue and white wire is going to be our tail light wire. The white and green wire is going to be our brake and turn signal wire. What we'll need to do is peel this back a little bit in order to get to the wires a little bit further back where we can splice into them. The first one we'll tap into is the green and white wire for the brakes and turn signals. Take the green and white one here, and we're going to clip it back here so you've got a little room on either side to work. I'm going to strip either side of this using some wire strippers. Now before I go any farther, what I want to do is, the wiring that we ran to the rear of the vehicle, I'm going to want to bring that up through here, so that I can get access to it to connect it in properly as I need to with these diodes. I already went ahead and routed the fish wire down through here along the inside of the rear fascia where you can see it's coming out the bottom there, and then I taped the wiring to the end of the fish wire. You can use some sort of light PVC tubing, something like that works really well, something that's a little bit flexible, but definitely gives you a little bit of rigidity. Then slowly work it up through here, pull up all the slack. Now we've got our 4-pole wiring pulled up through here, what we're going to do is take the green wire. That's going to be the wire that's going in for our brakes. I'm going to cut a little bit longer than what we have there. Be careful not to cut that yellow wire. Then I can peel it back a little bit, and I can strip the end of it. The diode we're going to be using for the brakes and turn signals on this passenger side is going to be using one of the ones with the 3 blue spade connectors. Once we've got all of our wires cut and stripped, we can pop these off one at a time, put it on there, crimp it, ensuring that there's a good snug fit. Then you can do that with another one of your spade connectors. Going onto the wire coming from the vehicle, slide the spade connector over, crimp it, ensuring you've got a nice snug fit. You can take your third one, put it onto the wire that's going into the back of your connector there. I'm also crimping that one. Make sure you've got a good snug fit. I'm going to put a little bit of electrical tape around the base of each of these, just to help with weather protection just in case for some reason there might be a little bit of moisture that gets in there. Once I've got all three of those done, I can grab my diode and take the green wire that'll be coming from the RV, plug it into one of the two that's one the same side. Then the one coming from our vehicle, we'll plug that into the other one. Then the one going to the connector, which will send the power to the tail lights, we'll plug that into the single side, which is where the power will come out. I'll go ahead and take this white wire, which is the ground, and then there's a ring terminal that's included in the kit. I'm going to clip my white wire about here to give myself a little bit of room to work so that I can mount that up in there. I'll also clip the brown wire right there. I'll need to hook a diode up to it as well. Now I'll strip the end of this brown wire. Then this blue and white wire is the one that's going to be our tail light wire for this side. On this one, I'm going to clip it a little bit further back in order to off set our diodes a little bit so they're not sitting right next to each other. Then strip both ends of that. Once I've got those stripped, with this brown wire, what I'll need to do, I'll need to take the remainder of that brown wire that's back here. I'm going to need to be able to run it to the other tail light so that both tail lights function. I'll strip the end of that. For that one, I'm going to use the diode that comes with the yellow spade connector. I'm going to put both of these into the end of this one and crimp that down. What that's going to allow me to do is it's going to allow both power to be sent to this diode for the tail light on this side. Then it's also going to allow the power to go back through this wire out to the other tail light. Take the end of my white and blue wire here and crimp one of my blue spade connectors onto it. Then do the same thing with the other end of your white and blue wire. Then again, I'm going to put electrical tape around the base of those, just for a little bit of extra weather protection. I can again take my wires where, take my yellow connector, put it on to one of the connectors on the side with two. Then put my blue connector that's got the blue and white wire coming from the vehicle onto it, and then I can put my connector that's coming from the tail light pigtail, and I can hook it up to the other end. Before I start feeding some of this stuff back down inside the fascia here, we're going to need to connect because we don't have quite enough extra brown wire to run all the way to the other side. I'm going to need to connect a little bit to it right here. I'm going to have to do the same with the yellow wire as well. I've got some more yellow and brown wire. I'm going to take some butt connectors. I'm going to crimp them together, yellow to yellow, brown to brown, sot that I've got enough that I can run them to the other side. Once I've got these crimped down, I used a heat gun to heat shrink these so that you can get a nice weather tight seal. You don't have to worry about corroding inside there. If you don't have a heat gun, you can use a lighter or something like that, but you just want to be careful to not put the flame directly on these. Let's take our white wire, strip the end of it. We can take our blue ring terminal that came with the kit, crimp it down, put a little electrical tape around that just to help weather proof it a little bit. Once I've done that, I can take a self-tapping screw, and then I can install it. I'm going to try and keep that wire tight, out of the way as much as possible. There we go. Now what we can do is take our diodes, and I'm going to take the sticky side off the back of this one and work it down in here. I'm going to stick that one right in there. The other one should be able to tuck up right behind the tail light when I put it into place. I went ahead and fed that extra yellow and brown wire that's going to be going over to our driver's side, fed it back down through and just inside the rear fascia. I kept it on top of the cross frame for the hitch in order to keep it up away from the heat of the exhaust and things like that. I fed it across, secured it where I could, then sent my fish wire down, then fished it back up to the driver side tail light. Now we've got our brown and yellow wire fed up through the driver side tail light. On this side, this outermost white and gray wire is going to be our tail light wire. The white wire is going to be our brake and turn signal wire for this side. We'll take the brown one and hook it up to the white and gray, then the yellow we'll hook to the white wire, using diodes on this side as well. Again, I'm going to offset these a little bit. We'll start with our tail lights. Strip both ends of that. On each of these we'll install a blue spade connector. I want to ensure that's nice and secure, then put a blue spade connector on the other end of it. Then again, crimping down that blue spade connector, making sure it's nice and secure. Then we can take our yellow and brown wires and separate them in order to get what we need, in order to be able to run that. Right now, we're doing the tail light, which is going to be your brown wire. I'm going to give myself a little excess to work with. I'll strip the end of that off, put on another one of the blue spade connectors, crimp that down. Then again on this side, on all these I'm going to add a little bit of electrical tape to help weather proof it a little bit in case there's a little bit of moisture, hopefully it'll keep that out to prevent corrosion in there so we can keep good contact. I'll do that on all of them. I'll take our diode, plug the brown wire and the gray and white wire coming from the vehicle into the end that says N over here, put two spades on that side. We'll take the one coming from the connector, plug that into the other side. Now we can do our white brake wire. Once we've got those two connected, I'm going to get about the length I'll need on this yellow wire. Again I'm going to give myself a little bit of excess just to make sure I've got enough to work with, clip it, and strip it. I'll put on my last blue spade connector, crimp it into place. Then I can put a little bit of electrical tape around all three of these as well. We can install our diode, again making sure the wire coming from the connector goes onto the single side. Now on this one that's a little bit further back from the connector, I'm going to take the covering off the double-sided sticky tape, feed it down in there to where I can get it stuck to the inside of the body paneling so it's nice and secure and out of the way. Once we've got our diodes all hooked up and secure, let's grab our tail light assembly, and we'll put it back into place, plug it in, work our light back into place making sure that those are lined up. We can pop it back in there. We'll do that the same way for both sides. Now what we'll need to do is take our 4-pole wiring, we need to get it hooked up into our 4-round connector. In order to do that, we'll take the little rubber grommet out of the back. Then there's this little Phillips head screw on top, take that out. That's small, so make sure you keep track of that. You can open this up, then you can push those out of there. Now we've got this all hooked up as per the instruction manual, pull it back out and make sure to align that little hole that the screw goes into with the hole on the body of the connector there. For hooking up those wires, there's little screws in there that you'll slide the spliced wire ends into and tighten it down. Once you've done that, you can send it back in and screw it back into place until it's nice and snug. Then I've already got it mounted up to this plate. You put some screws with washers and nuts on the back there. These line up right here, and they provide you some self-tapping screws in the kit, which you use to get those in place. Now what we'll do is we'll test it to see and make sure that all the lights work. What we're going to use is the Tow Doctor Trailer Tester which is part number HM50928. You can also do this by hooking it up to your RV and running the lights through there. On this one, we can see that this green light down here shows that we've got power coming into the box. What these switches will allow us to do is to send power to each set of lights individually, the tail lights and then the brake and turn signals. Now let's see and verify that our lights work. First we'll test our tail lights. Then we'll test our right turn and brake signal, and then we'll test our left turn and brake signal. It looks like all those are working, so we're in good shape. That's going to complete our look at the Roadmaster Diode 7-wire to 4-wire, flexo-coil wiring kit, part number RM-15247 on our 2015 Dodge Durango.


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Info for this part was:

Installed by:
Jeff D
Installed by:
David F
Video Edited:
Joshua S
Video Edited:
Jacob T
Video Edited:
Kathleen M
Video Edited:
Chris R
Test Fit:
Randy B
Test Fit:
Brent H
Test Fit:
Shane H
Video by:
Zach D
Video by:
Jonathan Y

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