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Roadmaster Universal Diode Wiring Kit Installation - 2018 Ford Edge

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How to Install the Roadmaster Universal Diode Wiring Kit on a 2018 Ford Edge


Hey everybody, Ryan here at etrailer. Today on our 2018 Ford Edge, we're gonna be showing you how to install the Roadmaster Diode Wiring Kit. But before we do that, why don't we just check this out and kind of see how it works It's a perfect example on how our wiring kit is actually gonna work. So we have the left turn signal going on our motor home and that is sending that signal to the back of our Edge. And so people are gonna know kind of what's going on and keeping you safe and whatnot. When it comes to wiring kits, this is usually the one I always recommend, I'd say probably 99% of the time.

And I say that because once it's installed, you're not even gonna know it's there. It looks completely factory. And they're really reliable too. We've had a lot of good luck with these. It's pretty rare that we end up running into an issue.

So that's always good, right And it's super easy to use. So literally once it's on, all you're gonna have to do is go up front and plug your cable into the front of your Edge into the back of your motor home. And that's really all there is to it. So nothing complicated or nothing to really figure out there. As opposed to some of the other wiring kits, magnetic lighting, for example, the ones where they actually will stick to your car and you have to run your wires all the way up to your motor home and plug 'em in every time.

Those work, sure, but they're kind of a pain, because you have to set it up every single time, drape wires all the way up to the front there. Not to mention, when you're done, you have to undo it all and then find a spot to store a big bundle of wires and some lights. And as we all know, when you're over the road, storage is a precious commodity. So having a set up like this is just really gonna help kind of streamline your whole flat towing process. So before we kind of jump right in, I figured it'd be useful just to kind of refresh ourselves on the main parts that we're gonna need to flat tow our Edge down the road in the first place.

And you're gonna have a total of five main components. First one being your base plate. And that's gonna provide us with an attachment point. That way we can hook our tow bar up to it. Tow bar is gonna be that second component. And this is gonna be the physical link that actually connects your Ford to your RV. Third main part will be safety cables. And these are there in the event of an unlikely disconnect. They'll keep everything paired together. The fourth main component will be the tow bar wiring, and that's just going to transfer the lighting functions from the back of your motor home to the back of your Edge, letting everyone know what's going on. And last but not least, the fifth main component will be a supplemental breaking system. And what that's gonna do is apply the brakes in your Ford whenever you hit the brakes in your coach, helping to bring you to a more complete and predictable stop. Up here in the front, I talked about how easy it is to set up, and all you're gonna have to do is plug your cable into the front of your Ford and the back of your motor home. That's really all there is to it. Now, there are several different kits available, and I just wanna kind of go over those and make sure you get the right one. And the main difference is gonna be what type of cord you're gonna get. And the right one is really just gonna depend a lot on your tow bar. So if you have a tow bar like this that does not have channels built into it or anything, you're gonna want to get a coiled type cable like this one. So this is super common, seven way on one end, motor home side, six way round on the front side. And then for whatever reason, if you want to do a four-way round and seven way, you can use this one, it's a another kit as well. But my thought is, if you're gonna go through the trouble to hook everything up you might as well just have the six-way if you ever wanna use other accessories or whatever. That'll work out a little bit better. And then if your tow bar has channels in it, okay So things that are on the side here designed to run your cables and everything through. If you have that style, you're gonna want to get the kit that either has a completely straight cable like this one with seven to six, and then there's also a hybrid type one as well, which is straight, and then at the very end, it's coiled. And I'd suggest that one on this Ford Edge, really, probably not a huge deal, but if you have a lot of space between the motor home and your vehicle, this one's a little bit longer, give you a little extra length there. And then probably one of the least common ones is this four way flat to four way flat. If you have a older motor home or something and you don't have a seven way, this'll at least get you going and at least get your signals back and everything else. And there's one kit that I like to kind of just say it comes with the bare bones. Essentially just the wiring and the diodes. It doesn't come with connector plug or your cable. And that's an option for those of you that end up picking up a more premier type tow bar. A lot of 'em will come with the connector plug and the cable with that tow bar. So for example, the Roadmaster Nighthawk is just one that comes to mind. And so if you have something like that, you just want to get that bare bones type kit because you don't need extra stuff, right So I'll save you a little time and energy there. But you know, with that said, at the end of the day, when it comes to getting those lighting signals to the back of your Ford, like I said earlier, this is a kit that I recommend all the time. It just flat out works and it's easy to set up, so what more can you really ask for As far as the installation goes, this one, it's really not too bad. It is time consuming, though, just having to route all the wires and everything else. But as long as you stay focused, you should be able to get it done. But with that said, why don't we go ahead and hook it up together now. To begin our installation, we're gonna be here at the front of our Edge. And obviously, we have have the front facing stuff removed, and we're doing that, it's this way because we're doing this at the same time that we're doing our base plate, which is what I suggest doing. Just have a lot more space to work. With that said though, first things first, we need to start to hook up our wiring connector. And a piece of advice if you're installing anything else, so for example, we have our diode wiring and a charge line, since these are gonna get routed essentially to the same spot, I would suggest doing these at the same time. It'll save you a little bit of routing and whatnot. So that's what we're doing. But you're gonna take the end of the wires and bring 'em over here to your mounting point. Then you can take the rubber dust boot, slide that over the wires. And then I'm just going to strip back the insulation a little bit. About like that. I'll give these wires a twist, and I'm gonna do the same thing for all the wires here. So now we can grab our connector plug and get that hooked up. So these are gonna be labeled and this one's TM for taillight. So the brown wire will go to it. This one's GD for ground. So the white wire will go there. This one is LT for left turn. So the yellow wire will plug into that one, and then RT for right turn. And the green will go into that. So the way these work, there's little set screws. You take a small Phillips head screwdriver. You wanna back these out pretty much all the way. Try not to pull 'em completely out though, 'cause they're kind of a pain to get back in and find a lot of times we'll drop 'em, but we're just gonna take the appropriate wire. So we'll start with our taillight and then it'll just plug in there. While you're holding it down, take the set screw and just snug it down. So I'm gonna do that same thing for our remaining wires. So this is what the back of the connector's gonna look like once you have all your diode wires hooked up. And since we have a charge line, I'm gonna get that plugged in next. And then once that's done, we can mount this up and start to route some of our wiring. With everything hooked on up, can take the dust cover, pop that on. And then at the very end, once everything's installed, I'll come back here with some electric grease and sealer and kind of seal everything up. I like to wait to then though, that way we know everything's working. But for now, this will work. Go ahead and mount up our connector plug there. Then we can start to route our wires. So comes out of the back of the plug. Just drops through here. It just kind of continues up, right up through there, where it will go into the engine compartment. So the diode wiring goes up into the engine compartment, like we said, and what I'm gonna do is hook up our white wire, first. This will be a ground. And it turns out there's a factory ground post right here, so that ought to work out perfect. So just kind of eyeballing the length here. What I'm gonna do is just very carefully cut just that white wire. All right. Try not to knick the other ones. And the end that we're gonna hook up will be this side. That's the side that is going to our connector plug up front. So we're go to remove the insulation there. Twist the wire. We're gonna take a ring terminal. Then on the bare end of the wire, crimp it down. Then this stud here, this is an 11 millimeter socket. Gonna remove this. And once I have this out, we can slide that ring terminal over it. And that'll provide us with the ground that we need. Got that out. Take this, run it through there. And simply just reinstall the stud. The rest of the white wire, the other side of it that is just attached to our bundle wire, peel that off completely and just hold onto it. We'll use it here in a little bit. But once you have that done, we need to get this underneath the vehicle. Not a ton of room, just ran it around that side of her battery and kind of shot it straight down along her firewall to the bottom of our car. So underneath of our vehicle now, our wiring drops down. And when you do this, make sure to do your best to avoid any hot or moving parts particularly in this area, 'cause that's where a lot of stuff's going on, but not too bad under here, actually. Just follow these factory lines. I just ran our wiring with those. You can if you need to, there's a couple of nuts you can pop off of this panel to help kind of pull it down. But I just ran our wiring along here and used some zip ties every now and again to keep it secure. Then it kind of just loops around here. And kind of go up through this opening. When you get to this point, make sure to go up and over your rear sub frame to avoid all these moving parts. And our wire's gonna just run along through there where it comes down to here. And what I did once I got to this point, I separated the green wire from our yellow and brown, and the end of that green wire, I taped on that extra piece of white wire. And I did that because this is gonna go over to the passenger side. So I just took those two wires and ran 'em along behind our bumper here on top of our hitch. Be careful in this area too, cause your muffler's there, you know. But ran it all the way over where it drops down here and we're gonna start hooking into our factory wiring. Usually, you would do this behind the taillight to mount up your diodes and stuff, but there's no room at all. So down here is gonna be our best option. That way we don't have to pull our bumper off and all this other crazy stuff, but here's our wiring loom. This is gonna go straight up. That's the one we're gonna be working with. And obviously, this had some of this tape on it. I peeled that off so we can work with the wires. But we're gonna be working with two of 'em. One of 'em will be white with a green stripe, which is this one here, and that's going to control our stop and turn signals. And then for the taillights, we're going to have a, get to it, a violet wire with a green stripe. Which will be this one here that I got in my hand. And so what you're gonna do is cut that in half, about halfway, something like that, and then strip back the insulation. Give that a twist. And you're gonna take one of these blue spade terminals, put that on the end of the wire and crimp it down. So I'm gonna do the same thing for the other end of our purple and green wire. And once that one's on there, I'll cut our white and green wire in half and crimp them on as well. So I got all these terminals on the ends of the wires, and now you can take your diodes and I just stuck 'em together. The sides that have a single terminal, you wanna plug that into the side that's going up into the taillight. So these just plug onto there and then we're just gonna go color for color. So this diode has the white and green wire on it. So I'll plug that in. Put it there. And then obviously the other one has a purple and green, so that one will go there. And then I took our new wiring that we ran. Stripped all the insulation back. The yellow one, I crimped on a blue terminal. The white and brown wire, you're gonna do something a little different. You're going to twist those two ends together. Just make sure to get 'em nice and tight. And you can grab another terminal here, except this one's gonna be a little different. It's a yellow one, it's a little bigger. We're gonna take both ends, slide that in, crimp it down. And now we can hook these up to our diode. So since the taillight signal is going to be the violet and green diode, we're gonna take that in there and plug it in to that diode. And then with the white and green's gonna be our stop and turn. We can take our yellow wire, our new yellow wire, and plug it into that diode. Over here on the passenger side, I essentially did the same exact thing here. Really, the only difference is gonna be the color of the wire. So over here, your stop and turn signal will be the gray wire with a violet stripe. And the factory taillight signal will be the white wire with the orange stripe. So with that side, you're gonna take the new white wire and plug it into the diode as a factory white wire with orange stripe, and the new green wire's gonna plug into the other diode, which is the gray wire with the purple stripe. It's now a good time to test your wiring to make sure it's working properly. So I'm just hooked up to a test box here in front that's simulating a motor home. Chances are good you won't have a test box so you can use your motor home, but keep in mind if your motor home has electrical issues on its own, that can translate over to your vehicle side. But with that in mind, we're gonna turn on our taillights, our left turn signal, our right turn signal, and our brake lights. Now that we verified everything works, I came back and just used some zip ties and tape and everything just to kind of secure everything down and clean up our install. So now that we have everything installed, I went ahead and put our front fascia back on the opposite way that we removed it, really with one exception, just having to trim it out. So instructions really don't give you a whole lot, so I figured it'd be more useful just to kind of see the finished product and essentially just have to hold this up and make some marks where you think you need to cut. So I cut out some openings for our base plate. In our case, we have this piece here, which is a a plug for a block heater. A lot of people probably won't have that. And then our safety chain tabs come out through the openings. And I just had to cut out some small portions to get our breakaway switch and our wiring connector through. So take your time, hold it up, check it out. You know, when you're cutting, make sure you don't hit any wires or anything. You can use a multi-tool, a pair of snips, a cutoff wheel, or a combination of all those tools. But once you figure it out and get everything cut, pop this back on and, and bolt everything back together the opposite way that we removed it. And that'll finish up our look at and our installation of the Roadmaster Diode Wiring Kit on our 2018 Ford Edge..


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