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Roadmaster Diode 7 to 6 Wire Coil Kit Installation - 2019 Ford F-150

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How to Install the Roadmaster Diode 7 to 6 Wire Coil Kit on a 2019 Ford F-150


Rob: Rob here at etrailer.com. Today you're going to be taking a look at the Roadmaster High Powered Diode wiring kit on our 2019 Ford F-150.Now, the whole reason why you're going to want a diode kit is because you want to take your F-150 behind your motor home when you go on your trips. But the problem comes in is we can hook everything up, but we need to have the signals back here, just like a trailer so we can safely and securely get down the road. So if we're driving and we need to change lanes, we can put the blinker on. But as you can see, you might not be able to see the blinker on your motorhome when you're behind the truck. So it's important to have those signals back here as well.Now there is a few different options of how we can get those signals back here.

We can have those magnetic lights. I know we've all seen them in the past. Just a separate light that you can stick on your bed somewhere and we're going to run a cable all the way to the back of our motor home and plug it in. Now they'll work, but that problem comes in because we're going to have a wire running all the way down the side of our truck. Banging in the wind, potentially scratching the paint.

Not to mention a lot of these new Fords have aluminum bodies now and magnets aren't going to stick to aluminum. So we're going to have to find some way to attach them other than that. Not to mention, we're going to have to find somewhere to put them when we're not towing, hook them up every single time that we do go to tow.But with our diode, it's going to be a onetime installation. So once we have them we can just hook up our tow bar and all the other components and not have to worry about anything back here. But when we're driving, our truck is going to act completely normal and we're not going to have any effects from the tail lights at all.

Our diodes are also going to protect our vehicle's electrical system because they're going to prevent any kind of backfeeding or anything else to our electrical system on our truck if there was a problem on the motor home end.Our diodes are going to come with everything we need to get it installed. The diodes, the wiring, all the connectors as well as the socket to mount on the front of our truck, and the cord to connect our motorhome to our F150. However, because our truck is so long, I do suggest you pick up a little bit of extra wire, anywhere from eight to 10 feet of 16 gauge wire should be enough. But we are going to have to run our wire all the way from the front of her truck where we mount our plug all the way back to the tail lights.But now that we know how our diodes are going to work and make our life easier, let's go through the installation together so you can have the confidence to do it at home.To begin your installation, you want to figure out where you're going to mount your wiring. For us, we mounted ours right next to our license plate and then we took our four pole wire we started at the front and we ran all the way back to where right underneath our tail lights at the back tailgate.

When we rounded it, we made sure to leave enough hanging out of the bracket so we can wire up our plug. But if we come in here you can see where it took down, went underneath the skid plate here and we popped out.We started routing our wire through that hole down the bottom of the plate, which actually brought it down we went over towards the driver's side, came from the bottom of the frame, went up and over control arm and strut assembly. Then I just routed it down towards the frame following it along the way, zip tying it to some existing lines and any other electrical components. I went around this front body mount and again just started continuing following it down the frame, securing it and this wiring and lines that are going along here. Try to keep it as high as you can on the frame. That way we're on to worry about any debris on the road catching it.But once I got to about the back of the fuel tank, or the back of the cab here, I went around the back side of the body mount. Just ran above the fuel tank, then you can see where I came back out and dropped to the inside of the frame just behind the fuel tank. Then you just follow the frame rail along, making sure to stay away from the spare tires so you don't worry about any kind of interference. Then I dropped it right on the outside of the frame right at the back by the tailgate.At this point I want to grab the end of our four pole wire and we want to separate these so we have four individual wires to work with. The easiest way is you take a pair of cutters and go right in between each one of the wires. We're just going to cut just a little bit at the very end. That'll give us enough to grab with our fingers and we just start pulling the wires apart. Now, again, we want four separate wires. So we're going to pull these wires apart as high as we can. Go to the last anchor point. Now that we separate them, we're going to move up top and we're going to remove our tail lights.So if we open up our tailgate on the inside here we're going to have two bolts that are holding our tail light in place. So we'll grab an eight millimeter socket and pull both of those out. Once you have both bolts removed you want to grab your tail light and pull straight back as you can. You don't want too much side to side movement because there are some pins that are holding everything in place and we don't want those to break. Once we have it loose we'll find the connector at the back. Want to push in on that tab and we can pull the connector out. We'll set our tail light aside and pull out the other side as well.At this point we need to test the functions of our tail lights and figure out what the corresponding wires do. So I have my circuit tester here and I have my tail lights on with no other light functions on so I can isolate which wire is going to be my tail light wire. So I'm going to take my tester and just goes through and start probing each one of the pins until I get a signal letting me know that it's on. I'm going to double check rest of the pins and make sure I'm not getting any voltage. But it looks like our tail light signal, if we're looking at the connector with the tab on top, it's going to be the third pin from the right side. If we follow that to the back, it's going to be the blue wire with the gray stripe on it. If we're looking at it, it should be the thicker wire that's in the bunch of three right here. The blue one with the gray stripe is going to be our tail light signal on the driver's side.So now I went ahead and turned my headlights off and I have an assistant pushing on the brake pedal so we can isolate that signal. I'll start going through checking each one of these. Now you may want to check your third brake light or your headlights in the front because if you have the door open, or if you've recently opened the door, your tail lights will stay on for a limited amount of time. Well we'll go through and check each one of the other pins for our brake light signal.So again I'm going to double check the rest of the pins. It looks like we're only getting a 12 volt signal from the second pin that's right next to our tail light. So if we follow that back, it's going to be the gray colored wire with the orange stripe on it. That's going to be our brake and turn signal on the driver's side. Now we're going to repeat this entire testing process over on the passenger side and verify the color of wires and positions of those as well.So now we want to remove some of the tape and pull back the loom that's around the wire so we can get access to the individual wires themselves and we have a little bit more to work with in this little section here. So just pull back some of the tape, peel it off the loom. Then we can pull it back so we have plenty of room to work. That should be more than enough wire to work with, but now we need to go underneath. We're going to take our yellow wire and our brown wire and we're going to bring it up to the tail light pocket. Now most likely you should just be able to reach underneath, push it up and grab it with your hand.Once you have your wires up top what I like to do is just take one zip tie, then we're going to secure it to the factory wiring. That way we don't have to worry about it falling back down underneath my truck, getting caught on anything when we're driving down the road. We're going to estimate about how much wire we need. I like to give myself a little bit of extra. So we're just going to cut both of ours off at the end of the connector here.Now for our brown wire, you want to hold onto the excess. But in our case we don't really have a whole lot. We've only got about a foot, maybe two left. So we're going to be using a lot more than this. So in our application we're probably going to use anywhere from eight to 10 feet. So it'd be a good idea to pick up some 16 gauge wire and you can pick it up here by the foot.So we're going to start with our turn signal and brake wire. Which you remember is going to be the gray wire with the orange stripe on the driver's side. So we'll start by coming to the connector, coming down a little bit. We're going to cut the wire in half and we'll strip back both ends. At this point I want to grab one of our diodes that has all blue connectors on it. We'll take two of them off, it doesn't matter which one. I'm going to take one for each end of our wire, slide them over the bare end and crimp them down.The we grab our diode and take the last connector off, and if we look at our diode we'll have two terminals on the inside and one on the outside. We want the terminal that's closest to the tail light plug itself to be plugged into the out. Then the other end of our wire, it's going to get plugged into one of the in terminals. It doesn't matter which one. Just want to make sure it's fully seated on there. We'll come to our yellow wire, we'll strip back the end of it and we'll put in our last connector. This is going to go into the other in terminal on our brake diode. So once you have your turn signal and brake hooked up, this is what your diode should look like.Now we can move on to our tail lights. That's going to be the blue wire with the gray stripe on it. Again, come to the middle downstream from the connector a little bit. Cut that wire in half and strip back both ends. This is going to hook up exactly the same as our other diode. At least part of it, except now we want to grab the diode that has the yellow connector on it. We'll start out by using the two blue ones just like before. Crimping it onto the end of our wires. Take our diode, same way, it's going to plug in one going to the in. The one closest to the plug so it can go to the out. Take our brown wire coming from the bottom, strip back the end of it.Now is when you want to grab either your excess, your extra length of wire, strip back the end of that as well. We're going to combine both these wires together. We'll have one from the bottom of our truck and then a length of wire that we can run over to the other side. We'll take our yellow connector this time, this is just a little bit bigger. It makes it easier to fit both the wires inside, crimp it down. Then this is going to go into the other side of our tail light diode. So once you're done with your diode it should look like this and we should have that length of wire coming out the end of the connector as well.So now that we have our driver's side hooked up we're going to take our length of brown wire that we've plugged in we're going to drop it down to the bottom so we meet up with the green wire, go over to the passenger side and hook it up the same way.Once you have all your diodes hooked up, we can plug our tail lights back in. Just want to tuck the wiring into that little pocket there so it won't interfere when we put our tail light back. We'll line everything up, make sure those alignment pins are lined up as well. Then we can replace the hardware and tighten everything up.Now the final wire is going to be our white wire. This is going to be our ground wire so we need to find a nice flat spot against the frame or somewhere on the body that we can attach it to. Now, right here at the end of the frame rail's a good spot because it's going to be nice thick metal. You can actually just bring our wire over and you put our ground right there. So I'm going to go ahead and cut the excess off of the white wire and I'll strip back the end. In your kit you'll find a small ring terminal, we'll slide this over the end of our wire and crimp it down. Then to attach it to the frame I'm just going to take the included self-tapping screw and I'm going to start a hole in the frame using a 5/16th nut driver. That way it's a little bit easier to put on with the hole pre-started.With the hole made we can take our screw go through the ring terminal and then put it back into the hole. When you tighten it down you want to make sure that it's secure and that ring terminal isn't moving around. But you also don't want to strip out the self-tapping screw. Now would be a good time to clean up any of the excess wires we have back here. Tie them off, make sure everything's nice and secure.Now we get ready to wire up our plug. I'm going to separate our wires again. Except this time we only need a few inches of each wire. We don't need to go all the way back. I'll just cut them again and pull wires apart. Just enough so that we can work with each one. Now we're going to want to strip back the end of each one of our four wires here. Grab our plug, I'm going to pull the boot off the back. I'm going to pass all my wires through the small end, have them come out the large opening. For now I'm just going to push it out of the way. But if we look at the back of our plug, we'll have all of our terminals and it is going to be labeled.If we go through the top of them. The top terminal here we labeled TM for trailer marker, that's going to be our brown wire. If we go counterclockwise the large one next to it, it'd be labeled GD for ground, and that's to be our white wire. The next will be LT for left turn, that'll be your yellow wire. RT for right turn, that'll be your green wire. Then over here on this side it's going to be labeled S and that's going to be for your electric trailer brakes and the center one is going to be pinned for your 12 volt power source and it's going to be labeled A for auxiliary.So we're going to go through and hook up all of our wires into the corresponding holes. Just when you do, you're going to take a really small Phillips screwdriver and I like to loosen these up. I don't ever take them all the way out because these set screws are extremely small and really easy to lose. Then we'll just take our corresponding wire, in this case the trailer markers, we'll grab the brown wire, put it into our terminal and I like to leave a very, very tiny bit of copper showing at the very top. That way I know I'm not going to get any kind of weird connection issues. I know just the bare wires going inside. Tighten it up, make sure there's no other wires hanging out cause any arcing issues and we'll just continue to go through hooking up the rest of our wires.Slide our dust cover on once we have all of our connections made. What I like to do is take some dielectric grease. Actually just going to fill up the back area through the boot, hopefully preventing any kind of corrosion or moisture from getting inside the connector. Then once we have it filled up I'm going to take some tape, I'm going to wrap the entire back of the plug. It'll help keep the boot in place and hopefully keep all that dielectric grease inside. It'll also help hide any your brightly colored wires, so it'll blend in better with the grill or the bottom of the bumper here.We're going to mount our plug, I'm actually going to pull my license plate off. If you didn't realize your license plates actually just held on by a couple of clips back here. Should be able to pull our plate off. Just these two little tabs are going to grab on. So we'll pull this off and set it aside for now so you have a little bit more room to get in here and get our hardware in place.So your kit's going to come with some hardware, so we'll line up the holes. We'll pass our Phillips screw through the bracket and through the plug, then we'll secure it on the other side using a nylon lock nut. Now there is a very limited space right here so you just want to make sure that you get a couple threads on there so the screw will hold itself in place and we won't have to worry about the plug falling off. Then we'll get the other one in place as well. We can just tighten up our hardware. Using a Phillips screwdriver, we'll hold the nut using a 3/8ths wrench.Now that the socket's nice and mounted, went ahead and put our license plate back in place. You can see that it is going to be touching the bracket, but it's still securely on there and locked in so we won't have to worry about it interfering.Now the final step of our installation is going to be making sure that our circuits are working properly. Now I went ahead and plug my F150 onto my tester. Now you can plug it up to your motor home to verify it as well. I'm going to go ahead and turn my tester on. You can see that our tail light function is working, as well as the left turn signal. My brake lights and my right turn signal. All we have left to do now is hook up to our motor home and hit the road.But again, I'm Rob here at etrailer.com and that'll finish up your look at the Roadmaster High Powered Diode Wiring Kit on our 2019 Ford F150.


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