Mount: Roadmaster Brake-Lite Relay Kit for Towed Vehicles on a 2014 Jeep Wrangler Unlimited

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Full transcript: https://www.etrailer.com/tv-install-r...
Today, on our 2014 Jeep Wrangler Unlimited, we'll be having a look at and installing the Road Master Brake Lite Relay Kit for Towed Vehicles, part number RM-88400. All right. With our key out of the ignition, when we step on the brake in our vehicle, simulating our towed vehicle braking system pressing down on the pedal, we don't have any brake lights in the vehicle right now, which is a good thing. Otherwise, if we didn't have this brake light relay installed, when our brake pedal was depressed, the brake lights in the vehicle would come on, potentially overriding the RV's turn signals, which would control our towed vehicles turn signals as well when it's hooked up. When we put our key in the ignition and turn it on, we now have functional brake lights on our Jeep. Whenever we're ready to drive our Jeep normally, we don't have to worry about flipping any switches or unplugging anything. The relay takes care of it for us automatically and will have normal brake lights as needed. When our vehicle's in tow-mode and hooked up to the RV, all the functions for the tail lights and brake lights and turn signals will work off of the RV side, so we don't have to worry about the pedal causing our Jeep's brake lights to come on when it's depressed.

Now that we've gone over the features, we'll show you how to get it installed. Okay, we're inside our vehicle now, we need to locate our brake light switch. The easiest way to do that would be to remove this panel, underneath our steering column. Just grab it, pull back, and it comes out. Now, behind that panel we find another panel. It's held in place with two 10 millimeter bolts.

We'll remove these. We'll grab the panel, pull up on it, and slide it out of the way. Now, with that panel removed, we can see our brake light switch, which is right here. Now we need to find which wire going into it is the cold side of our brake light switch, meaning there's no power flowing through it until the brake pedal is depressed. We'll use a test light to determine this.

I'm going to probe this wire, here, press on the brakes. Okay, so we've determined with the test light when we step on the brakes that the light wire with the brown tracer end is the cold side of our brake light switch. We'll disconnect our connector now so I have more room to work with it. You get it out, you pry open the tab, right here. There's two, there's one here and one here, and it releases the locks and then it pulls out. All right.

Here, our wire's clipped to the side of our dash. We'll just pop it loose to give us more room to work with. Right here, these green tabs, that's where we had to pry loose from the yellow side of the brake light switch in order for us to get it unplugged so we can it bring it out here to work on it. Okay, now we'll cut our white and brown wire, right here in the middle. Now we'll strip back some insulation from both ends of the wire we just cut. We'll place on a blue butt connector that's provided with the kit onto each wire, and we'll crimp it down in place with our wire crimpers. Our wiring harness, that has the socket for our relay to plug into, we can take all of our wires, here, and fold them back, except for our blue wire. We'll take our wire cutters, here, and we'll cut off the blue wire. We don't need this wire for our particular application. You would be only using this wire if your vehicle had a push button start, but ours starts with a normal, old-fashioned key, so we don't need to worry about having this wire. Now we'll take our green wire, here, remove the piece of pre-stripped insulation, twist these together. Now we'll place this inside the butt connector that's closest to our connector, here. I'll crimp that down. Now we'll take our black wire, pull off the pre-stripped insulation again, and we'll place this inside our other butt connector, right here. At this point, we can plug our relay into our relay socket. It'll only go in one way. As you see, we have two tabs that are horizontal, matching each other, so we'll just line it up in the proper direction and push it in 'til it's secure. At this point, since we have all of our connections made to our connector for our stop light switch, we can feed our relay and our connector back behind the dash and plug back in the stop light switch. We'll just line up the tabs on the c