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Demco 4-Diode Universal Towed Vehicle Wiring Kit Installation - 2022 Ford Escape

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How to Install the Demco 4-Diode Universal Towed Vehicle Wiring Kit on a 2022 Ford Escape


Hey everyone, how's it going Today, we're gonna be going over and showing you how to install the Demco diode wiring harness here on a 2022 Ford Escape. So a wiring harness is basically going to transfer these signals from the motorhome to our flat towed vehicle, so we can let other motorists out in the road know what signals we're gonna be making. Now, this is not only a safety concern, it's also a legal requirement in every state, and it is a required part of your flat tow setup. Some of the times, your vehicles can actually block the lights on your motorhome. So you need a way to safely and effectively transfer those signals. Now there's many different options that transfer these signal from the motorhome to the vehicle.

But a diode wiring kit is really going to be your best one. Now the reason the diode wiring harnesses are the best options is because they utilize the factory taillights. Therefore you don't have to worry about any additional lighting on the vehicle, such as the magnetic lights that sit on the roof and you have to drape the wiring down the hood of the vehicle. And it certainly doesn't look the best. So having those factory taillight circuits there is really gonna make for the best overall appearance.

Now, with the diodes, those are gonna stop the backflow of electricity. Therefore you don't ever have to worry about your motorhome affecting the lights on your vehicle or vice versa. Everything is gonna be separated out from one another. So you're not gonna have any lighting issues with your motorhome or vehicle. So the only downside of the diode wiring harness is that you do have to splice into a couple wires here on each side of the vehicle, but it is very minor.

You're not gonna affect anything on the vehicle by doing so. So don't let that stop you guys. This is truly the best kit here for this vehicle to transfer your signals from the motorhome. So this is a complete kit. Not only do we get all the wiring we need and the diode to connect to the taillights, we're also gonna get our connection from the vehicle to the motorhome, the umbilical cord.

The umbilical cord has a seven to six way design. So seven way on the motorhome, which is most common and then six way on the vehicle. And it does give you this six way shown here. So this is a great coiled hose. Therefore, it's not going to drag on the ground. It's gonna keep it nice and tight to the bottom of the tow bar. As we said, the seven ways just gonna simply plug into the motorhome. Pretty much every motorhome out there with the trailer hitch has a seven way as well. So shouldn't need to worry about compatibility issues there. And then in regards to the six way, as we said, this comes with your kit here. So you'll just wire this up to the diode wiring that comes with your kit. Very easy. We will show you how to do that. And there's also an extra circuit in here that allows you to run a battery charge line from the motorhome, so you can charge your vehicle's battery. Now that's actually a requirement for this vehicle. So it's gonna be great to have that option. You don't have to worry about running a separate wire, everything is gonna be included here in the umbilical. So we did just touch a little bit on installation but just speaking to that further, most of this installation process is just finding a path to route the wiring harness from the front to the rear. Everything else is pretty simple and we'll actually walk you through this entire process now. The only tools you're really going to need are just some basic common hand tools, and then perhaps a pair of wire cutters and crimpers. A lot of those tools are two in one, they're very cost effective, so only a couple bucks. Definitely something you're gonna need. So I recommend picking that up. But aside from that, as we said, it's very straightforward. The system works very well. Let's go ahead and show you how to get it installed now. So keep in mind, we're gonna be doing this installation without our bumper fascia off today, 'cause we just got done installing the base plate. So that's what I recommend doing for you guys as well. It's gonna give you some more room to work. You can still do it with the bumper on place but it's gonna be a little bit harder to work around. So you're gonna need to sort of figure out the first couple steps by yourself if you still have the bumper on. But if not, we'll go ahead and show you how to route it with your bumper off. So the first step of our installation we're gonna take our main wire harness bundle that comes in your kit. You're gonna cut off the two trailer connector ends. We're gonna tie it off to a point on the front of the vehicle. And then we're gonna route those wires all the way back to the rear where our taillights are. So we went ahead and got our wire routed. We can show you the exact path that we took. But you can see here, I gave myselves a couple inches or so of this wire to attach my trailer connector to. But for right now, we're just gonna circle this around our base plate kit, and then we'll deal with the trailer connector a little bit later. So, all we did now is I just took this wire and I routed it underneath this panel here, all the way over up into this area here. And then we'll go underneath and show you where that comes out. So your wire is gonna pretty much come out in this area here. Now, if you wanna make things a little bit easier on yourself, go ahead and grab a seven millimeter socket and remove these screws on the outside edge of this panel. That way you can pull it down, you have a little bit more room to work but we basically just routed our wire atop this panel here. There's a couple wires that we zip tied it to just to keep it nice and secure. And then it's gonna come up and over our panel. You can see it poking out here. So again, we took a 10 millimeter socket and we removed a couple of these metal nuts here that secure this panel, that way we could just drop it down. And again, just run your wire straight over this panel, still above the panel all the way over to here. And if we pull this down, we might get a small glimpse of that wire coming out here and then we just zip tied it at some existing lines. We're gonna go up and over the sub frame. You wanna be careful in this area here because we have our moving suspension components, the coil springs, we have the rear axle along with the trailing arm. So, I just have it zip tied to some brake lines at the top of the frame to keep it secure. Then we're gonna come up and over the back portion of the sub frame, all the way over to here where we have another zip tie, and this is where our wire and harness is gonna end. We're gonna go up top, take our taillights off and then we can feed our wires back through. So now that we have our wire and ranch of the rear here, we need to go ahead and open up the tailgate and pop off our taillights. So in order to do that, we're gonna need a flathead screwdriver. And if you look in here, you're gonna see a little cover. So we need to go ahead and pry that off. Should just pop off like that. And that's gonna reveal a torque screw, which we'll remove with a T15 Torx, or a T25 Torx bit. Now we will remove the taillight by pulling out and away from the vehicle. Now we can't remove any of the connectors here for the taillight, so we're just gonna let it hang to the side here. So now that we have this taillight off, we'll just go ahead and pop the other one off in the same method. And then once we get that done, we're gonna take some sort of pole wire, a plumb bob, whatever you have that we can sneak between the body paneling, the rear bumper here. So we're just gonna take this and we're gonna stick it down through there. And basically what I'm looking for is, was I'm looking for this wire or this line to go all the way out underneath the bumper there. That way I can tie my wiring here to that pole line. And then I can pull this back up into the taillight pocket where we're gonna be making our connections. So here is where the airline tubing that we routed to there is gonna come down. I just had to reach up there and pull it down a little bit. But once we have it down here, we're just gonna take our wires here. And we're just gonna tape them to that piece of air line tubing. That way we'll go back up top and pull everything through. So once you have your wires up here, I went ahead and just zip tied it to the factory wires there. And what that's gonna do is that's gonna prevent your wires from ever falling back down underneath the vehicle. So, now that I have the wires up here, I'm gonna have each of these strands, I'm gonna go ahead and separate these from one another. Now, once we have that done, we need to take a look at the wires coming out of this grommet here going into our taillight. So there's two of 'em we're gonna be using. We're gonna be using the purple wire and the yellow wire shown here. So the purple wire is gonna be for our stop and turn signals. And then the yellow wire is going to be for our taillight. So about midway, I'm gonna cut each of these wires. Just like that. And then I'm gonna remove some jacket on either side of those wires, so we can attach one of our spade terminals. So now that we have all of those wires stripped here we're gonna take our purples spade terminals, we're gonna go ahead and crimp one onto each of those four wires. Now, sometimes those wires can kind of fray on you, you can see those individual strands. So, in that point you would just go ahead and just twist them together. And the reason we're using the purple, not the blue spade terminals, is 'cause the purple ones are a little bit smaller so they grab onto these smaller wires better. So you can see we got our purple spades now in each of those four wires. Now the next thing we're gonna do is we're gonna take our brown and our yellow wires that come from the wiring that we ran from the front of the vehicle. We give ourselves a little bit of slack here, I'm gonna go ahead and cut those off. Now on these two wires, we are going to remove some of the jacket, and we're gonna be splicing on our blue spade terminals. So there is a small difference with this brown wire here. We actually need to make a jumper wire. So the remaining portion of this that you cut off, we're gonna attach it here to this wire, just like so. And then we're going to crimp on one of our blue spade terminals. Now we can start making our connections. We're gonna grab one of our diodes. The outside is gonna go towards the bulb. So we're gonna start with our purple wire here, which is for the stop and turn. Go ahead and plug that in. Our other purple side is gonna go to the inside, just like so. And then this little terminal here is gonna be for that yellow wire. This is the one coming from our harness up front in the vehicle. Now we're gonna do that same thing there for the taillight one. So just go ahead and repeat those same few steps. So now that we've got our diodes attached here, what we need to do next is we need to take our brown and our green wires, and I'm gonna feed this back down through that opening there because these are actually gonna be ran over to the passenger side of the vehicle. And then the button things up here, we're gonna have our white ground wire. So I'm gonna go ahead and just cut off some excess to that. And then I'm gonna strip some jacket back and crimp on the ring terminal that comes in your kit. So there's only one ring terminal. Then also in your kit, you're gonna get a self tapping screw and we're gonna use that self tapping screw to secure the ring terminal to the inside of the body here on the metal surface. So now that we have all of our connections made, we'll go ahead and reinstall our taillight. Now I'm gonna level with you guys, this is gonna be kind of difficult because there's not a lot of room here in the taillight pocket. And we have these diodes which are adding some considerable thickness. So, we're just gonna show where to shove everything in there as best we can, making sure that we don't undo any of those spade terminal connections. So now underneath your vehicle here, you can see our brown and green wires that we fish down underneath. And now we're just gonna route them over. You can see I left the zip ties attached so you could see what we're securing it to. And you wanna be careful when you get around this area here 'cause you have our tailpipe. So you're just gonna go up and over like so, we're gonna leave it here for now. And then I'll use that other fish wire technique that we just showed you, to get the wires up in the taillight pocket over on the passenger side. So we're over here on the passenger side now. You can see that we have our brown and green wires pulled up into the taillight pocket. Now, as soon as you get them up here, I went ahead and zip tied them so it'll ever fall back down. And then we'll just make our connections. Same thing we did over on the driver's side, for the exception of the taillight jumper wire, you don't have to do another jumper. That's just gonna go to one of your spade terminals there. And again, the yellow wire is going to be for the taillight circuit. Therefore, we need to connect the brown wire to that. And then our purple wire is for the stop/turn signal circuit. Therefore we need to connect our green wire to that. So now we're ready to install our trailer connector. First things first, I'm gonna go ahead and separate each of these wires, and then I'm going to trim them back the appropriate amount. So we go, now they have 'em already to connect. So our particular base plate kit actually has two little standoff tabs that we can mount this to. If your base plate kit doesn't provide some sort of way to mount the trailer connector, you're gonna have to come up with that on your own, because they really don't provide any brackets for this. But thankfully, most of them will. This is a Roadmaster baseplate kit, for example, but I'm pretty sure all the major brands are gonna have a way to mount this. So, we're just gonna simply secure our trailer connector to the mounting bracket that comes with our baseplate. And if you're wondering what this extra red wire is for, this is for a battery charge line circuit. You will need that for this vehicle, so it's a good thing to go ahead and obtain one. This is a Demco battery charge line circuit that we're installing. But we're gonna take our boot here. We're gonna place all of our wires through that end of the boot, and just tuck it back up there like so. And now we're gonna strip the jacket off each of these wires and begin attaching them to the terminals on the back of our trailer connector. Now we're gonna take our small flathead screwdriver, I'm gonna go ahead and find one of the terminals here. So this is GD, that's gonna be for ground. That's gonna be a white wire. So go ahead and loosen that screw, don't remove it completely. And you'll stick your white wire into that location. And you'll just simply tighten it down to lock it in place. Now that we have that one on, we're just gonna repeat the same process for each of our remaining wires. They are all labeled. The RT is for right turn, that's gonna be your green wire. The LT is for left turn, that's gonna be your yellow wire. And then the TM is going to be for the running light circuit. That's your brown wire. So now that we have all of our wires attached, before we seal everything up and install it onto our little taps here, I wanna go ahead and plug it in just to make sure everything's working correctly. So I'm gonna take the umbilical cord. It's a pretty tight connection. But I'm just gonna go ahead and plug it in there. And then we're gonna plug this other end. We're gonna be using a test box here. If you guys don't have one of these, you could obviously just use your motorhome. Just keep in mind if there's any issues on the motorhome they will affect your testing here on the vehicle. So now we'll go ahead and walk through our signals here. We have our taillights, left turn. Brake lights. And right turn. So now that we've verified everything is working correctly, we can go ahead and seal up our connections here with some RTV silicone. So this is just gonna prevent any water getting in there and corroding the terminals. Once we get 'em all coded, we'll go ahead and slip our boot. Trying to be careful not to get too much of that silicone there in the seal. There we go. Now we'll go ahead and mount up the trailer connector to those tabs on our baseplate. So now that we've tested everything and we know it's working properly, that's gonna do it today for our look in installation of the Demco diode wiring harness here on our 2022 Ford Escape..


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