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Roadmaster Tow Bar Wiring Kit Installation - 2006 Jeep Liberty

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How to Install a Tow Bar Wiring Kit from Roadmaster on a 2006 Jeep Liberty

Today on this 2006 Jeep Liberty we are going to install part number RM-154 from Roadmaster. What this does is allows us to wire up the vehicle so that it can be towed behind an RV. The first step is to route the wire from the front to rear and the wire harness comes with two truck ends on the wiring harness itself. We are just going to cut off one end of it, leave about a foot or so on there in case we need to use it again or in case the original one gets worn out. This 4-pole is going to stay at the front and basically you can think about it as like wiring up a utility trailer. This is going to stay in the front and the car is going to become a trailer at this point. We are going to run our wire between the plastic up in here towards the center as close as possible because in the future a face plate will get installed in that general area. Thread that on through until we come out the other side and we are going to route it all the way back and stay away from the suspension components and we are actually going to run it through the frame. 01:00

What we did to get ready is we ran a fish wire from the end of the frame and we were lucky to get up towards the front suspension. We are going to run our wire above the suspension down and we are going to run it back through this hole here and then we will tie off our fish wire and we are going to pull it all the way out through the back to the vehicle. We will leave just a little bit out here for now just to keep it from getting pulled in. We will simply tie it off and zip tie it to a piece of the car here. To keep the wire from wandering over to the hot exhaust we will just use a simple clamp just to pull over this side and keep away from the heat. Our next step is to get access to the tail lights themselves so we are going to open up the rear door. So the door is open and we now have access to our screws for our tail light. We have got a nice length of wire to work with so we will just set this down to the side, loosen our wires here a bit. Let it sit just like that. Lets go ahead and pull the wire from the bottom up. We have got our wire loose, go ahead and tip this connecting light from the wire harness. 02:21

Here use the ends to test which wire does what instead of making a bunch of holes in the plastic. This is the size of the diodes that we are working with. These littles terminals come off and these parts actually get crimped onto the wires. There is a specific way to install this. Just to make it simple the out always goes out to the tail light and the in is going to be coming from the car itself. It does not matter which one of these is going to be in coming from the factory wire harness and the other end is going to be coming in from the harness we installed. Anytime you apply power to a circuit and the vehicle is being towed you always have to have a diode. You want the power to come out to the tail light and not back feed to the vehicle which could potentially do some damage to the wiring or the computer itself which would be very bad news. We will have to splice in this area so we have got plenty of room to work with. Next we are going to test our functions. There is a natural tenancy to go find the left turn signal. Since we only have four wires coming back and this is a five wire system on the vehicle what we are going to do is actually make the brake signal do double duty. The brake signal on the bulb itself is going to act as our turn signal and our brake light just like a regular combined system would work. When we are towing the vehicle down the road you will have a red flashing and brake aside from a yellow flashing on the vehicle when it is by itself. Either way the vehicle is powering itself or being powered by the RV, they are going to operate in the correct manor. 03:53

Next we are going to go ahead and install a ground so we have something for our tester to go to. It will go straight to the body. Next we will check for our brake signal. It looks like it is going to be white with a tan stripe. Retrace the wire back to the white with tan stripe and we are just going to cut it in half. Strip the wire back, give the ends a twist, install our ring terminal, and crimp it into place. This is going out to our tail light so we will put that to the out tab on the diode and then our input does not matter so lets put it on the bottom one here. Our connection is complete as far as the car thinks. Next add the left turn and brake to this remaining tab right here. Split the wire back a ways just enough to get it started to pull it apart. Hook the yellow wire if it is going to be left turn from the RV. Plug that in to the remaining tab on the diode. Now just leave it alone. Do the same thing again, this time looking for the running light circuit. That looks like the red wire so we will work our way back. Here is the red wire so go ahead and do the same process over again. Output wire going to the tail light, our input from the vehicle. The running light input will be coming from our brown wire from the RV and we will go ahead and split that one off. There is going to be a little bit of a twist to this one. What we are going to do is actually run a jumper from this running light side over to the running light side that is going to be on to the passenger side. We will go ahead and strip these wires, make them a little longer than normal. Twist these together like you are going to a wire nut then put our terminal onto that and crimp them both into place. We will take our terminal and push it back on to the tab. We will go ahead and hook up our ground wire and we will use the same ground we used for testing and that is going to be our white wire coming out from the RV here in the ground. We are just going to use a ring terminal to get the extra line around. Put that on there and we will just hook it to our ground screw that we made earlier. 06:34

The remaining wires we have left are going to be our green wire which is going to run over to the passenger side and our brown wire. We are not going to use a white because it is already grounded up to the body. The yellow wire we are not going to use because we already hooked it up to the driver side break signal. We are just going to take the rest of our wire here and just tuck it underneath and go back to the passenger side now. Once we have this ran below we can go ahead and put our tail light back together too. Just make sure you put that lock back into place. Start taking the passenger tail light assembly apart. We have got our tail light assembly apart. Go ahead and get back underneath the vehicle. Run the wire harness from the driver side over to the passenger side. We are going to take a wire and just fit it behind the bumper forums here. Lets start checking our signals. We are looking only for the brake signal. We use the doors right here for the ground for a tester on this side and we will look for our brake lead. Our brake signal again is going to be white with a tan stripe. Go ahead and cut it and put our diode in. Remember, out goes to the tail light and then our input. Again it does not matter which side so now for our turn and brake signal we are going to be using the green wire here and put our terminal on there. The connection is done, now do the same thing again and we are going to look for our running light circuit. That looks like white with an orange stripe. Our brown wire that we jumped from the other side to here we will split that one off. We will not need yellow or the white so we will go ahead and get rid of those for less confusion. We will put that on the remaining terminal. Now we can tuck this all back in behind the tail light again and we will go ahead and reinstall the tail light. 09:19 Everything is back together we will go ahead and apply power to our 4-pole in the front of the vehicle, check that all of the signals work. Shown here now you can see why we did not use the turn signals on the vehicle itself. We are using the break signal as our turn signal as the conventional trailer would be. In this case since the vehicle is getting towed it is kind of like a trailer so you can keep it like that. All right as you can see with the vehicle disconnected from the RV you can see how it works as normal with the turn signal and the brakes. At this point we have the base plates installed on the vehicle and then we can go back to the wiring and basically we start off with a 4-pole flat but our tow bar is actually going to use a 6-pole connector and that comes supplied with it so what we are going to do is actually mount this to the vehicle. There is not really a good place to mount a bracket to mainly a lot of plastic but the plastic here in the bumper with a nice space open here it might be a good idea to go ahead and take this and drill a hole in it and mount it straight to the bumper that way it is on an even plane with it and it will be plenty strong. When you find a spot in here make sure you have plenty of clearance behind it and we will just drill out our hole. Next we will drill a couple of holes for our mounting bolts, we will take it off and go ahead and start wiring the 6-pole up with the four wires we have got here. We are not going to need this 4-pole anymore so we will cut off the 4-pole and get started. Apply on some loom first. Go ahead and strip our wires back, remember our color code. White is going to be ground so it will run to our GD on the connector here. Next hook up the brown wire and that will go to TM marked on the 6-pole. Next we will do our yellow wire now go to left turn on the 6-pole marked LT and the green wire is going to be right turn labeled RT on the 6-pole. We will go ahead and put a few layers of tape around the connections make sure they do not go anywhere. Slip the 6-pole in position and put the cover back on and just bolt it to the bumper and we are good to go. With that that finishes our install with part number RM-154 from Roadmaster.

Mark C.


I have a 2005 Jeep Liberty. The video helped with my installation. I will be a returning customer.

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