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Demco 4-Diode Universal Towed Vehicle Wiring Kit Installation - 2021 Ford Ranger

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How to Install the Demco 4-Diode Universal Towed Vehicle Wiring Kit on a 2021 Ford Ranger


Hello neighbors. It's Brad here at etrailer and today we're taking a look and installing the Demco Diode Wiring on a 2021 Ford Ranger. Now when it comes to flat towing a vehicle, you need to make sure that you have your lights on the towed vehicle to let the people behind you know and many times you'll see magnetic lights or ones that you just kind of stick on. Well, the great part about diode wiring is, once you have it installed in your factory wires here, you're still gonna retain all your normal light functions but it's actually gonna mimic it based off the RV and that's done via the umbilical. So once the diodes are installed all you have to do is hook up the included umbilical here from our seven to six pole and that's gonna transmit all of our turning, running lights as well as our brake lights to keep you safe and legal. Now there's gonna be five main components when you are flat towing a vehicle and the first one we'll start on the vehicle side is gonna be the base plate.

And that's what actually attaches to the frame or the bumper support to give you a sturdy mount to have your arms, to attach to your tow bar and that's gonna be your second component. Your tow bar is gonna be the connection point between the towed vehicle and the RV's hitch. Now going along with the base plate, this one actually has an integrated safety cable hoop here and most of them will. So that way you can hook up your safety cables which is your third component. And that's just gonna allow, if the vehicle was to disconnect, it's gonna hold that together and it's not gonna separate.

Now you also have supplemental braking. So when you put the brakes or stop in your RV, it's gonna apply that appropriately on the vehicle and also you have a breakaway cable here, that way if it does fully become disconnected, it'll pull this cable, putting the brakes on the vehicle and bringing it to a stop. Your final component is gonna be your diode wiring and that's the umbilical here which is gonna send our stop, running light and turn signals from the RV to the towed vehicle to let the people behind you know what you're doing and keep you safe and legal. To begin our install, we routed from the front to the back of the vehicle and now we'll pick up from there. So our brown and yellow, I've pulled these up kind of got the major part of the slack out, cut those down and stripped them.

So now we're gonna take our brown and white jumper wire here and I'm gonna be using the blue spade terminal. It does seem like it's a slightly larger gauge. So that's gonna allow us to kind of get this on there and then we'll go ahead and crimp this down. Then I'm gonna just throw a purple on our yellow. So now we're gonna want to actually get our diode and you're gonna see it's labeled out and then in, in.

So your out is gonna be facing towards the plug. So we'll just go ahead and make that connection here on our black and white and our solid red. And then it really doesn't matter which one you use on each end as far as making the connection here but you do want let's take our solid red and match it in that way that connection is still complete on our factory wiring. And we'll do the same here with the black and white. And so now, we have our stop and turn signal. Now this is gonna go with our red. So the yellow is specific to the left side. Now we have that connection made and then our tail light or running light, this is gonna be that jumper. So we have our brown running to it and that white's gonna go over to our passenger so we'll just plug that in here. And then at this point, what I like to do is actually kind of zip tie this or tape it all together and that way it's not moving all around. It kind of keeps it cohesive, keeps a little bit of that stress off the wiring as well. So I'm gonna go here and throw a zip tie around just to kind of keep it secure. So now that we have our connections made here, again, I've kind of just used electrical tape just to kind of keep those electrical connections secure. We'll go ahead, plug this back in, lock it in place and get our taillight back in. Now you're also gonna wanna pull some of this extra slack out and zip tie anything else that might be bundled up. So, there's this nice pocket in here, I'm gonna run our wires in there and then we'll get our taillight in place. So now we're gonna just repeat the same process on the other side by getting our taillight out and peeling back that wire loom and tape that's on the wiring and then we'll make the connections over there. Now you'll be happy to know, on the passenger side, the wires are actually gonna be the same color. So you have your red with your red and your green is gonna tie into here. So that's gonna be that wire that we split off and then our white jumper wire, pull that through and that's gonna go to the black with the white. So we'll just go ahead and make sure that these are all tied up together and then we can now get our taillight back in. The white wire that actually ran into our running light circuit, we passed this over and the way that I did that is just kind of using this under frame here. There's some holes that you can kind of zip tie as you go and there's also a factory wiring harness that you can attach to. So that's the way that I routed it. And now that we have all of our taillights up, you might wanna go back and just kind of zip tie up everything, any loose ends, any of that extra wiring that might be there, the slack and just kind of clean it up and that should do it for at least putting the wiring on our taillights. So now we can actually make our attachment here on our six pole. Now you might notice this had a four pole on both ends originally and you probably noticed when I tied into those, I actually did cut those off. So that's what we're gonna do here and now we're pretty much just gonna kind of make a nice clean cut here. Now, you can also kind of lay it out to see where your plug's gonna sit and if you need to, you can trim a little bit further back, that way you don't have a bunch of extra slack here but sometimes it's nice to have that just in case something goes wrong with your plug, you can tie that excess up and that way you'll have a little residual if you ever need to replace that plug. So, what we're gonna do here is just split these back a little bit and we'll just strip off these ends here. So now you're gonna wanna take the boot off the back of your plug and we're gonna just feed this kind of up just kind of backing out of the way for now. And then we can grab our six pole here and it's gonna be kind of nice here 'cause they actually lay them out as far as letters so you'll see the arrows point to which ones they go to. So we'll have our RT is gonna be our right turn, our LT will be left turn, GD is gonna be our ground and TM is gonna be our taillights. So, I'm gonna get our wires hooked up and I'll show you how I did that. Now, in order to get these loose to get the wires in, we're gonna be using a small flathead so you're gonna wanna grab a small screwdriver here and back these out to create that gap but don't pull 'em out all the way as they are kind of tricky to get back in. Now you don't need to over tighten these, you want 'em snug to where they're not gonna come out but if you really crank 'em down, it can actually damage the wires. So just go and make sure that you have solid connections by just giving a slight tug and then if you need to, you can always tighten them down just to smidge more but this is kind of what it's gonna look like here. So our right turn signal, my arrow's pointing here, it will be our green wire. Our LT or our left turn signal is gonna be our yellow. GD is gonna be our ground, so white and then our TM is gonna be our taillights here, our running lights, so that's gonna be our brown. So now that we have this all attached what I'm gonna do is actually put a little diode electric grease kind of throughout here just to kind of protect our connections. You can also put black silicone in here to kind of keep a waterproof seal but what I'm gonna actually do is put our boot back on and then I'm just gonna take some electrical tape and tape it around right here as well as here where the wires are and that's just gonna kind of create a little bit more of a water tight seal. So now that I have our wires attached to our six pole, I'm gonna go ahead and mount this up on our bracket. Now, our base plate actually came with one so that's what I'm using but if you need to pick one up, we actually have plenty options here available etrailer and there's a lot of different styles too to kind of custom cater to the application of your vehicle to give you a perfect fit. So now we're gonna want to actually check to make sure that our diode wiring is actually working properly. Now I'm using a test box. You can actually hook up to your RV and we're just gonna run it through the light cycle of running lights and our turn signals as well as our brakes to make sure that they're working. So now I'm gonna start off by doing our running lights. Next, I'm gonna go to my left turn signal, then I'll do my right turn signal and then finally my brake lights. Now with everything working properly, you're ready to actually move along to whatever flat tow components you need to install. Now, something else I might recommend during the flat tow, I think putting a charge line is a good option and that's gonna tie into your six pole as well and what that's gonna do is allow you to charge the battery of the towed vehicle and that way when you get to your destination it's not gonna be dead. You're not gonna have to jump it. So something to think about while doing your wiring, maybe it's something you wanna add on. And that was a look and installation of the Demco Diode Wiring on a 2021 Ford Ranger..


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