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Demco 4-Diode Universal Towed Vehicle Wiring Kit Installation - 2019 Ford Ranger

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How to Install the Demco 4-Diode Universal Towed Vehicle Wiring Kit on a 2019 Ford Ranger

Clayton: Hello, everybody Clayton here at Here at, we install, test and review a lot of different products to help you as a customer make a more educated decision before your purchase. Today we're going to be taking a look at and I'll show you how to install the Demco 4-Diode Universal Towed Vehicle Wiring Kit on our 2019 Ford Ranger. Our diodes are going to give us all those necessary functions on our towed vehicle from our RV to keep everybody safe behind us when we're flat towing our vehicle.Our diodes are going to be necessary to get all of our lighting functions back to our towed vehicle from our RV to keep everybody safe behind us and to let them know what we're doing. We're going to get our stop and turn signal and our running light signal. Our diodes are going to be one of the key components in our flat towing setup.

We're going to have our supplemental braking system, our tow bar, our base plate, our safety cables, our diode wiring of course, our charge line kit, our 12 volt outlet kit and our brake light relay.One nice feature of the diodes is it is going to prevent back feed, so it's going to protect our factory tail lights and we don't have to worry about it frying our electrical stuff whenever we're not flat towing. And like I said, you are going to need a brake light relay for this setup, and that's just because you don't want the stop signal overriding the turn signals. That way if you're sitting at a stoplight, people are always going to be able to tell what you're doing. There are going to be a couple of ways to get our necessary lighting functions back to our towed vehicle.Used to be a lot of people would use magnetic lights, and it just doesn't look as good. There's magnets and wires and stuff just hanging off the back of our truck and especially when we have a tonneau cover, it's going to be hard to find somewhere to stick those lights.

Personally, I always like to go with the diodes. It keeps everything contained in our tail light housing and just looks a whole lot cleaner. And probably the best feature of this kit is it is going to include everything we need to get it installed.It's going to include the 6-pole plug on the front and our umbilical cord. We don't have to try to hunt down extra parts and possibly miss something in the process. And in terms of installation, getting it installed really is not that bad.

The hardest part is going to be running our wires from the front to the back. With that being said, I'll show you how to get it installed now.To start our installation, we're going to want to run our wiring from the front of our Ranger to the back. I'll go ahead and do it and I'll show you the route we took. I tied off a lot of our extra wire with our plug here up on the front, that way if we ever have to come back and make changes, we'll have room to do that with some extra wiring. And I ran our wire up around our base plate and up along the side of our frame rail here.

Kept it real nice and tight to our frame rail through here. You want to keep it out of the way of anything hot or moving.And then it comes out right back here. We just zip tied it to our frame and followed our factory lines, and over our crossmember, and all the way back. Zip tied these lines here, then it goes up over our fuel tank. It's going to follow the fuel tank all the way back to right here. Then I pulled it out above our fuel tank and zip tied it up there to our factory lines and above our strut. Then I tucked it up and over our frame rail and pulled it out here, and then zip tied it to our factory wiring.We're now ready to remove our rear tail light assembly. There's going to be two 8mm bolts that we need to take off. And with those removed, we can pull out on our tail lamp assembly. Just have to wiggle it around to get those clips to release, just like that. Then we want to come down to our plug, there's going to be a red tab, you're going to push out on the tab, just like that, and we'll push down on this gray tab, then pull off our plug, just like that. Going to have a plastic connector here. Just want to pull that out of our tail lamp and we can set this off to the side.Now we just want to come back with a utility knife and cut off our sheathing from our wires. We now want to grab the end of our four-pole wiring. We're going to slide this up through the bottom of our Ranger. And we can kind of push it up and then reach here, and then pull it the rest of the way. We now want to grab the end of our plug and we're just going to cut our plug off of our wires. With our plug removed, we are going to pull our wires apart. And all we're going to need on the driver's side is going to be our brown and our yellow wire. We'll pull off our green and white wire all the way back underneath and just let those hang.Our red wire is going to be our brake light signal and our black with a white stripe wire is going to be our running light signal. Now we want to grab our wire cutters, just going to follow this down pretty far just like so, and we'll cut these right here and we're going to strip back both ends. And now we want to cut back our yellow and our brown wire. We're going to strip both of these back as well.Now I'm actually going to save the brown wire because we're going to use that as a jumper wire to get our signal over to the passenger side. We're going to strip that one back just a little bit further than the others. Now we want to grab our blue spade connectors and slide our wire in and then we'll crimp it down. We can now grab one of our diodes. We're just going to add our yellow wire there. Now we can grab our red wire, slide our spade terminal on and crimp that down as well.And now we're going to plug this one into the same side as our yellow wire. This is going to be our in signal from our factory wiring. Then we want to grab our red wire going to our plug, and this is going to be our out signal because it's going to our plug eventually. And with that plugged in, the red wire completes our factory circuit. Then when we have an in signal from our motor home, that'll switch over and use the yellow wire and then send it out to our plug.We can now add our spade connectors to our black and white wire. Now I'm going to grab another diode and I'll plug one into the in signal and this side into the out signal. And again, that is going to complete our factory circuit. Now, like I said, we are going to do something a little bit different with this brown wire. Just want to twist our wire like so and we're going to grab the extra brown wire, pair that with our new wire, and we're just going to twist these together just like so. Then we can grab our snips and cut off our excess.And since our wire is a little bit thicker, I did have to grab a different spade connector. You can find those here at The wire was just too big to fit through the opening on our ones provided. We just want to take that and plug it into the side on our diode just like so. And what we're going to do is take our spare brown wire and drop that back down through our hole. Now I'm going to grab some more provided zip ties. We're just going to zip tie our diodes together. That way they don't shift and bounce around and potentially become disconnected just like that.I'm just going to zip tie through here randomly. And then we can actually slide some of our factory wire loom back over this end, just to help protect our wires. We now just want to grab our tail light assembly and re-insert our plug, snap it back in. We just want to drop all of our wiring back down how it was before, then reinstall our tail light in reverse order we took it apart. Now we'll move over to the passenger side and remove this rear tail lamp in the same way. We now want to run our brown and our green wire over to the passenger side. But first we're going to make our ground connection with our white wire. The end of our frame rail right here is going to be a good mounting location for our ground. We're going to grab our white wire and mark it right there and trim some off. And we'll strip it back.I am going to use a different ring terminal than our kit came with, or one provided. It's just kind of small and I'd rather use a bigger one. And you can find that here at Now we can grab our ring terminal. We're just going to slide it over our wire and crimp it down. We can grab a self tapping screw, kind of lift it up right here and install it on our frame rail. We are going to have to extend our brown and our green wire. You want to make sure you're using a wire with a similar gauge. We are going to use heat shrink butt connectors. If you don't have any, you can find those here at Our brown and green wire come out right here. That's right up over our rear bumper. Then there's some factory wiring I just zip tied it to along the way.And it just follows that frame rail all the way over between our hitch and our bumper, comes over here and then up and over the same way that we did on the driver's side and comes down right here. And I just zip tied it to our factory wiring. Now we just want to grab the end of our wire and then we'll reach up and push it through the hole and then grab it on the other side. Now we just want to pull our wires tight up and through the opening in our tail light, just like so. Now we're going to make our connections the exact same way that we did on the other side, using the red wire as our stop and turn and the black with the white stripe as our tail light. With our wiring cleaned, we can slide our plug back on. We'll kind of tuck our wiring back up in this opening like we did on the driver's side, then we can reinstall our tail lamp assembly in the reverse order we took it apart.With everything hooked up, we can now move up front, hook up to our alternate power source and test everything out. We can now test out our tail lights. We'll do our left turn, our brake lights and our right turn. Now, if you wish to swap your four-pole end at the front for the included six-pole, you're just going to cut off that existing four-pole, strip back the wires and match the wires to the proper function indicated on your six-pole plug. With our wiring hooked up to our RV, we are now ready to hit the road. That's going to do it for our look at and the installation of the Demco 4-Diode Universal Kit on our 2019 Ford Ranger.

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