Roadmaster Tow Bar Wiring Kit Installation - 2017 Toyota Corolla iM

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How to Install the Roadmaster Tow Bar Wiring Kit on a 2017 Toyota Corolla iM


Rob: Hey everybody. Rob here at etrailer.com, and today we're going to be taking a look at the Roadmaster high powered diode wiring kit on our 2017 Toyota Corolla iM. Now whenever you want to tow your Corolla behind your motor home, it is going to be required by law that you have your light signals match your motorhome. So if we change lanes, we need to have our signals matching back here with a match on our motor home. So everyone around us knows what's going on and we can all be safe. Well, one way to do that is the old way of doing it, is having those magnetic lights.

Now those, that's going to be an extra step that we're going to do every time we hook up. Not to mention we're going to put our lights on, we have to run that wire all the way up to the front. Then while we're driving down the road, that wire's going to be moving around, potentially scratching our car. And then once we get to our destination, we're going to have to find somewhere to put those lights.Well, I don't know about you, but if I can make my life any easier, I'm going to take that route and our diodes are definitely a lot easier because it's a one-time installation. There's no extra setup after that and as you can see it's not going to change the outward appearance of our Corolla at all.

And the way the diodes are going to work is we're going to have a four pole wire that's going to route from the front of our vehicle all the way back to our tail lights. We're going to tap into our taillight and our brake light functions. That way our motor home can send those signals to the factory bolts, so we're not going to have to drill into our taillight, add an extra bulb like some of the kits do. And again, we're not going to have to stick magnetic lights to our car.As soon as we hook up to our motor home, the lights will come on so long as we have everything hooked up, and we're not going to have to put anything else extra on there. But another thing our diodes are going to do for us is it's going to protect our Toyota's electrical system because it's not going to allow any kind of backfeeding going into our system in case there was a problem on the motor home end.Now the front of our diodes is going to give you a four pole connector.

Now the bracket it's mounted to is not included with it. That came with our base plate, but you do just want to find somewhere secure to mount your four pole wiring so that you can hook it up to your motor home. Now obviously to hookup your four pole to your motor home, you're going to need a jumper cable and they are going to provide you with that.Most four poles will have a single pin coming out and then you'll have three that are covered, and this is going to be the exact opposite, making it super easy to hook up. All we need to do is plug it in, plug the other end into our motor home and we're ready to go with our lights. Now the cable is going to be six feet, so we have more than enough once we have our tow bar hooked up and everything else, to reach the back of our motor home.

Now as far as the installation goes, it's going to be pretty straight forward.We're just going to have to run that wire from the front to the back of our tail lights and then we'll have to remove our taillights and tap into the circuits we need to. I do recommend that you pick up a circuit tester if you don't have one because we are going to have to test each one of the wires to figure out what function they serve. A lot of people may get nervous about tapping into their vehicles electrical system. Rest assured it's really not that big of a deal and we can walk you through the process of how to test everything and go through which wire does what function. In fact, let's go ahead and do that together now.To begin your installation, you want to start at the front of your Toyota. Now I do want to mention obviously the front of our car is taken apart right now because we just got done putting our base plate on. And that is going to be the easiest time to route your wires because we're not going to have to worry about going through the grill and fighting all the components because it's nice and open. But you want to find the spot you're going to mount your wiring. Here we have our posts and our four pole that's built into our base plate, so I just went ahead and attached the bracket that came with our base plate and then used a zip tie to make sure it's nice and secure. And you want to route your four pole wire all the way back to the back of the tail lights.Now to make it easier on yourself, our wire is going to have a four pole on two ends. We only need one. So I cut the other one off so it's easier to pass through some of these places. But I routed it along the edge of my base plate here, putting a few zip ties to make sure it's not going to move around. I came down to right about the side where the radiator is and I went down towards the back of my car. Now one thing I do want to mention when you are rounding it, you want to stay away from any moving parts or anything that's going to have extreme heat sources that may damage that wire. So my wire went underneath the front skid plate here. You can actually see it through that opening. Started going towards the back and once we got to about right here, there's a lot of components going on.We have our steering rack and our axle, so a lot of moving parts. I went up, you can kind of see through here. I went up and I started securing my wire to the frame, going over the steering rack and everything else. I have it secured. This is some brake lines and then this bracket right here. That way I can stay away from all of these moving components. I started running my wire back, came to this cover. I just ran it underneath this cover, following it all the way till it comes out. Followed my emergency brake cable, went underneath this cover again, except this time I routed it going over the subframe brace, making sure I stay away from all of these components. And my last anchor point is going to be right here before we get to the rear skid plate.Now at this point again as I mentioned, it's going to be easier to route everything if you cut that four pole off. And once you do cut it off you'll see that the wires are already separated. But we want to pull all the wires apart to the last anchor point. So we have four individual wires that we can work with. Now that we have our wires back here we need to move up top, open up our hatch so we can get access to the bolts holding our tail lights in place, and there's two of them for each taillight. We're going to grab a 10 millimeter socket and pull each one of those out. Now once you have those removed we'll go ahead and grab our taillight. Now there are some alignment pins so we don't want to wiggle it too much side to side. You want to come straight back as much as possible to release it.Once you have your taillight removed, we're going to have several connectors back here. Now we're going to pull all the wires out of the clip so they're nice and loose. Now one connector is going to be held in with a push pin type fastener. If you can, you can get your fingers in there and you can squeeze it. If it's a little bit tight where you can't get it, you need a flat blade screwdriver or trim panel tool. We'll come underneath the connector. We'll try to pop that clip out so we can get access to everything. We just squeeze the tabs on the side and push in. It should come out.And once we have that connector loose, we'll be able to remove the rest of the connectors and get our tail lights aside where we won't have to worry about them getting damaged. Each one of these connectors with the tape going around the wires, just turn them counter-clockwise. We'll be able to pull those bulbs out. But our one connector here is still going to be connected to the tail light so we can find the tab that's going to be on there. The little gray tab right here. We're going to push down, separate the connectors and we'll set this aside for now. Then we can take out the other tail light and repeat that same process.I went ahead and turned on my taillights. Now we can already tell that neither one of these bulbs are lighting up, so we know that if our tailors are working properly, it's not going to be either of these bolts. And we want to grab a circuit tester so we can test all the wires and figure out which wire is going to send that tail light signal out. So I'm going to go ahead and test the pins inside this connector to see if one of them is our tail light signal. You can see the pin we're looking at where that clip is, the pin on the right hand side. If we follow it back, it's going to correspond with the red wire. That's going to be our taillight signal. Now we want to make sure that we go over to the passenger side and verify that it's going to be at least in the same location in the color wire over there as well.I went ahead and turned my headlights off so that I can isolate my brake signal. Now you do want to double check you're not getting any power on your tail light signal or getting any kind of weird connection issues because we want to isolate just the brake signal at this point. We obviously know it's coming from one of these wires since this bulb is lighted it up. So I'm going to take my tester, I'll check each one of these wires and see which one is going to be the positive wire. So it looks like it's going to be the green wire that's on the connector that has kind of a tannish brown colored connector on it. I want to verify again on the passenger side and figure out what color and position our wires you're in for our brake signal.So we went ahead and verified. Now over on our passenger side we have all the same style, color and location of connectors. So again, our tail light signal is going to be going along this red wire that's on that small gray connector, and the tannish brownish color connector. The green wire is also going to be our brake signal, just like the driver's side. Now that we've identified the functions and what wire they're going to run along, we need to get our four pole wire up to the top. Now the easiest way that I found is you get either a coat hanger, a thick piece of wire. Here I'm going to be using an airline tube.I'm going to pass it down in between the body till I can reach it at the bottom, attach my wires to it, and then pull it up. And again, you can use really just about whatever you have, even if you just have a string with something heavy attached to it. You just want to make sure that you can get it down to the bottom and we can get access to it. Now that skid plate is under there so we may not be able to see our wire right away. So we're going to go ahead and beat it down till I know that it's in the bottom somewhere and we can go underneath and remove that skid plate if necessary.I went ahead and moved underneath. Now you can see my wires sticking out here and I actually just kind of pushed up on my panel and it popped right out. Now if you can't find it real easily, just several pushpin fasteners here on the edge, give you enough flexibility to reach your hand in there and find your pull wire. Now I'm going to make sure that my pull wire goes around the panel so I'm not going to be coming underneath and I have my wire hanging down. You just want to make sure that you can get access to your wires here, and make sure it goes underneath the panel. It's nice and protected.We're only going to be working with our brown and yellow wire to start out with. So I'm going to find the end of those. Again you want to make sure the wire's going to be protected and it's not going to be hanging down below. But once we route it over to our wire, we're going to attach it and pull it up top. I'm going to go around my panel here. That's my wire so it goes over the top. Pull it out over on the side so I can get close to my wire and you can either tie this, use some tape or whatever. Again, whatever you have available just to make sure you're not going to drop it and it gets stuck underneath here. Again you just want to make sure your wire goes underneath all of that. I just pulled one pushpin out so it wouldn't be underneath there.Now we move up top, start pulling all the wiring up. You just want to pull the wires up. Now you want to make sure you get all the wires up top and pull all that slack out. And once you think you have it all the way up, it's not a bad idea to check underneath. Make sure there's not a length of wire that's hanging down that potentially get caught on anything. I also like to take my wire and create an anchor point with my factory wires, just a zip tie or two. That way I don't have to worry about it falling down, again getting caught on anything when I'm driving down the road. This way, no matter how much slack is here, it's not going to affect the underneath of the car.But now that we have our wires up here, we need to remove this protective tape that's on our connectors here. Now you can use a knife, pair of scissors, whatever you have. You just want to be extremely careful not to damage either one of the wires inside. It's almost like a little silicone sleeve. So you just cut it. We should be able to rip it open once we get a little slit. That way we don't have to worry about damaging the wires. That'll expose both of our wires here and our smaller connector. There's not a whole lot of room here, so you can actually just remove the tape and then we'll follow our wires up. Give us a little more wire to work with. We just want to have at least a few inches of each wire that way we won't have to worry about being so tight on the connector, which is easier to work with and easier to make all the connections we need to.So we're going to start with our brake signal. We're just going to correspond with our yellow wire. So we'll find the green wire on our connector. We're going to cut it directly in half. I'm going to come down from the bulb itself just a little bit and cut it in half. We're going to strip back both ends of our wire. I'm going to grab a diode that has all blue connectors on it. And we're going to take two of the spade terminals off. Doesn't matter which ones we grab, we just want to grab two of them. And we're going to crimp them on to the ends of the wires that we just stripped. And grab our diode. We'll remove the last spade connector, and if we look at the front of it, we're going to have two terminals on one side and one terminal on the other side. They will be labeled in and out. We want to make sure that the out terminal is going closest to the bolt or socket. So we'll take that connector, plug it into the out terminal.And the other wire is going to go into the in terminal. At this point it doesn't really matter which one. We just want our signal from our car to come in, go through the diode and out to the bolt. Now we'll take our yellow wire. I always like to give myself a little bit of slack. So I'll make sure I have plenty of slack there. And I'm going to do the same thing. I'm going to cut the wire in half and then I'll strip back the end of it. And I will let you know these wires have a coating on them, so it may be a little hard to strip them because there's an extra coating on top of the insulation. But if you have a good pair of strippers or if you just keep working at it, it will eventually strip the wire. Just a heads up. Take our last spade connector, slide it over the end of our wire and crimp it in place. This one is going to go into the open in terminal on our diode.So once you have your brake signal wire connected, this is how it should look. Our yellow wire and our green wire both coming into the diode and then one wire going out to the brake light bulb. Now our tail light connector and our taillight wire, we're going to follow pretty much the same concept, except this time we want to grab the diode that has the yellow connector on it. So we're going to cut our red wire right in half, strip back both ends, and put a blue spade connector onto each one of these wires. Grab our diode, pull that last yellow connector off. We want to make sure that the spade terminal closest to the connector goes into the outside and the one farthest away goes to the internal.Now again, we're going to take our brown wire this time, give ourselves a little bit of extra slack. Cut the wire. Except this time we want to hold on to the excess. So we're going to strip back both ends, the one coming from the bottom, as well as the excess wire that we just stripped off. We're going to combine the two wires together. You just twist the copper ends together and that's really the whole reason why they give you the large yellow connector. It's just easier to get two wires inside of this connector rather than trying to cram them into the blue one. So we'll crimp it in place. Then we're going to connect this one to the other in terminal on our taillight diode.Now the whole purpose of that is now we're going to take our brown wire, we'll pass it back down through. This way both of our tail lights are getting the same signal from each side. So we want to pass our brown wire down, meet up with our green wire, and go over to the passenger side. And we're going to hook our brake light wire up to our green wire, and the other tail light side up to our brown wire. Now we'll just use the same method to bring our green and brown wire up. Again, you just want to be careful how you route everything because the exhaust is pretty close on the passenger side. So you want to make sure you go over that when you bring your wire up so it doesn't cause any damage.These are going to hook up just like the other side. Cut our tail light wire in half. Crimp on our spade connectors. Make sure the connector closest to the bulb goes into the outside. The other one will go into the in terminal. And we didn't have a whole lot of slack here so you want to make sure again that you anchor it off because we do have a little bit but we don't want to cut anything too soon to where we run out of wire. So we're going to go ahead and anchor both our green and brown wire off at the factory connector here. Then we can make our connections.Now we actually have a little bit of extra wire, but depending on how you route everything, you may need to extend your wires. But the car's not that long so it should be plenty. Crimp our last spade terminal onto our tail light wire, plug it into our diode. I'm just going to repeat the process for our brake wire, which again is going to be that green wire and the green wire coming up from the bottom. So it should look just like the other side. Only difference really being is our yellow wire is going to be green on the passenger side, and we're only going to have one wire going into our tail light diode over in the passenger side.At this point we want to put all of our connectors back in our tail lights and they are labeled. If you look really closely, it'll let you know what each connector should go in. It'll say base here. So we know we want to put the tannish colored one in there, and right at the bottom here it is going to say gray. Just in case you forgot where they go it's real easy to put them in. That way you don't have to worry about stretching wires or putting them in the wrong connector. Now we have the option of removing this backing off of our diodes. And we can either stick the diodes together to try to keep it more compact and give ourselves some room. Or if we have enough slack in our wires, we can attach it to the body.What I like to do is I like to get my tail light in place, kind of see where they're going to sit. And then if I can I'll go back and stick them to either each other or the body. But you want to make sure you can get your tail light assembly back in place before you start permanently attaching anything. Because if our diodes need to be moved it's really difficult to get that sticky tape off, and then we won't be able to inaudible 00:20:46 after the fact. So I just want to dry fit my taillight, kind of wiggle my diodes around to see where I can position them to where everything will fit together, and then we can stick them together and put our fasteners back in. I'm going to put our fasteners back in place. I'll do the same thing for our other tail light.Now we should have one more wire left underneath our Toyota and it's going to be our white wire. Now this is going to be our ground wire and we need to find either an existing ground or a nice solid piece of metal that we can attach it to. Now I just routed this over to the passenger side. It's going to be right behind our exhaust, but we have a nice really easy shot to get to the bottom of our frame here. I don't suggest that you put it in the bottom of the floor because our spare tire is there. And I really don't know how thick the metal is so I don't want to put a hole in my spare tire. So what we're going to do is we're going to take the self tapping screw that comes in our kit. We'll start a hole in the bottom of our frame. Then we'll put a ring terminal on our wire and secure everything. Use a 5/16 nut driver to get my hole started. Just go right into the bottom.Now the hole is started, I'm going to remove the screw. I'm going to figure out about how much wire we need. We'll cut the excess off, strip the end of the wire. You want to grab the small ring terminal out of our kit, slide it over the end and crimp it down. Slide our screw through the ring terminal and then we'll tighten it down. Now when you do tighten this down, you want to make sure it's nice and secured where the ring terminal is not going to move. But you don't want to strip out the screw. Now we can always tie up our excess wire here to keep it away from our exhaust to this existing wiring here so we don't have to worry about it moving.But now that we have our diodes in place, before we put our fascia back on, we have a few more components that we're going to install for our flat tow setup, and then we can check and verify that all of our lights are working properly. Now I have my wiring hooked up to a tester so I can verify that it is working. Because if you hook it up to your motor home, we're not going to be able to isolate the problem if there is one on the motorhome. So I'll go ahead and turn my tail light function on. We can see that both sides are working. My left turn signal is working, my brake lights, and my right turn signal. Now that we know everything is working properly, we can hook up to our motor home and hit the road.


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