bing tracking image

Roadmaster Brake-Lite Relay Kit Installation - 2013 Jeep Wrangler Unlimited

content loading

Products Featured in this Video



How to Install the Roadmaster Brake-Lite Relay Kit on a 2013 Jeep Wrangler Unlimited


Today on our 2013 Jeep Wrangler Unlimited, we'll be installing the Road Master brake light relay kit for towed vehicles. Part number RN-88400. Here's what our brake light relay kit looks like installed. Goes into an existing fuse tap on the vehicle. This will allow you to hook up to a supplemental braking system when you're flat towing your Jeep. That way when the brake pedal is depressed inside the Jeep, you don't have to worry about that overriding the turn signal signal coming from the motor home and you'll only have your brake lights on the back of the Jeep and you don't have your turn signal functioning working properly. With this in place, your brake light switch inside the vehicle does not have any power going to it unless the key is in the on position of the Jeep when you're driving it.

That way when you're driving it, it functions like normal and you don't have to worry about your brake lights not working but when the key is in the off position, you can press on the brake pedal all you want and the brake lights won't come on. You'll be relying upon the signals from the RV treating your Jeep as a trailer. Now that we've gone over the features, we'll show you how to get it installed. First thing we need to do is gain access to our brake light switch. It's located up behind our dash, basically behind this panel here. So we can grab this panel, disconnect it, set it on down.

We'll find two ten millimeter bolts behind this black panel, remove those. Lift up and set that aside. Here's our stop light switch right here and there's our connector for it. We'll unplug our connector right now. Now we need to find the cold side of our brake light switch. I already know which side is the cold side because our vehicle has a brake controller installed.

It's this white and brown wire which our brake controller is tapped into. Now if you don't have a brake controller installed on your vehicle and you want to test to make sure the wiring color is correct, you can use a test light and if you don't have any signal coming from the brake light switch until you step on the brake pedal, then you know that that's the cold side. I'll just go ahead and cut this guy right there and I'll add two butt connectors to either end. We're going to remove this quick connector here to get rid of that and then we'll tie that wire in with our connection. With that removed we have plenty of wire to work with now. Strip back some insulation.

We'll tie these two wires together, insert a blue butt connector in to it and we'll crimp that down. And the other end, strip that off too and we'll place on a blue butt connector on that as well. This other connector looks like now that we've used our butt connector on both ends, where we cut and we hooked our brake controller wire back on. Now on our relay harness here, there's five wires. We're only needing four. We don't need this blue wire. This is on other vehicles that have like push button starts like some Ford products and some newer Jeeps. So we'll just cut that wire off so we don't have to mess with it and we'll be using the green wire first and this will go to the side closest to the connector for our brake light switch. So that will go on this butt connector here and we'll crimp it on down. Now our black wire will hook into the other butt connector. This will allow our brake lights to still operate. Put that in there, crimp it down. Double check all of our connections, make sure they're nice and tight, which they are. The white wire here is our ground wire. We're going to ground this to an existing ground point already on our chassis right here. I grabbed a different ring terminal. It comes with a significantly smaller one than I'm going to use. I'm using this to fit over the existing stud so we'll take our wire, double it back here a little bit so it fits in our connector tighter and we'll crimp this down. Take off one of these nuts, slide the ring terminal over. Re-install the nut, snug it back down. Now our red wire is our final wire. We need to attach this to a fuse spot on the vehicle that only has power when the ignition is running. Now it comes with a length of wire to attach inside the vehicle but our fuse box is underneath the hood here on this vehicle so we'll be using some longer wire. We sell it by the foot on our website. It's part number 16-1-1. It's sold by the foot, we're going to use about ten feet. Okay so here's our extra wire that we're using to go to the fuse box. I couldn't find a red wire to match so I just found what I had so we'll install a butt connector on that. This will attach to a red wire. Now this green wire here, we need to pass this through the fire wall on our vehicle. Since this vehicle is equipped with an automatic transmission, there's a pre-existing grommet that's easy to pass through. Here's the grommet that we're talking about underneath the hood. I've already pushed the wire through, now I'll grab it and pull it on to the engine bay. Okay with all of our connections made underneath the dash now, we'll plug our stop light switch back in. Once it clips in place, we know we're good and we'll make sure we plug our relay into our relay socket. It's already pushed in. So we got everything tucked up here now, now we'll just re-install our panels the way they we're installed originally. We went ahead and routed our wire that we extended across our fire wall over towards where our battery and our fuse box is. We'll be using this ten amp fuse here in the fuse box. This fuse only has power when the ignition is on, we'll remove it. Place into our fuse tap here on the bottom side. This will protect the circuit that the fuse is removed from. We'll add our included ten amp fuse into our fuse tap. This will supply power to our kit for the brake light relay. Then we'll push this down into position like so and we'll make a notch in our fuse box lid. Okay we'll close the lid on up and we'll measure off how much of our wire we're going to need, cut off the excess and we'll stick it back and install it under our fuse tap. Our key is not on the ignition so it don't have any power going to the circuit so we're safe to make our connection. And that completes our installation of the Road Master brake light relay kit for towed vehicles, part number RN-88400 on our 2013 Jeep Wrangler Unlimited.


Questions and Comments about this Video

Info for this part was:

Employee Joe V
Test Fit:
Joe V
Employee Randy B
Test Fit:
Randy B
Employee Brent H
Test Fit:
Brent H
Employee Shane H
Test Fit:
Shane H
Employee Robert C
Test Fit:
Robert C
Employee Conner L
Test Fit:
Conner L
Employee David F
Test Fit:
David F
Employee Ryan G
Test Fit:
Ryan G
Employee Clayton O
Test Fit:
Clayton O
Employee Zack K
Video Edited:
Zack K
Employee Joshua S
Video Edited:
Joshua S
Employee Jacob T
Video Edited:
Jacob T
Employee Andrew L
Video Edited:
Andrew L
Employee Dustin K
Video Edited:
Dustin K
Employee Sue W
Video Edited:
Sue W
Employee Chris R
Video Edited:
Chris R
Employee Zach D
Video Edited:
Zach D
Employee Andrew K
Video by:
Andrew K
Employee Kathleen M
Video by:
Kathleen M
Employee Alan C
Video by:
Alan C
Employee Jonathan Y
Video by:
Jonathan Y
Employee Michael B
Video by:
Michael B
Employee Cole B
Installed by:
Cole B

At etrailer.com we provide the best information available about the products we sell. We take the quality of our information seriously so that you can get the right part the first time. Let us know if anything is missing or if you have any questions.