etrailer | Install: Roadmaster Brake-Lite Relay Kit for Towed Vehicles on a 2022 Ford Ranger

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Full transcript: https://www.etrailer.com/tv-install-r...
Hey everybody, Ryan here etrailer. Today on our 2022 Ford Ranger, we're gonna be showing you how to install the Roadmaster Brake Light Relay. Before we get into that though why don't we just take a minute, check this out and see why it's a good idea to use one of these. The whole point of a brake light relay is allow all your lighting functions to operate correctly. And with these trucks, if you don't use a brake light relay, let's say if you're at a stop sign, making a left turn, without a brake light relay, the motor home's brake signal would override the turn signal. So for example, you would have the motor home as it is with the brake light on the right, left turn signal flashing.

We're back here on the truck, you would just have your brake lights on. And you can see where that would get confusing to people behind you, you know, they'd wonder what the deal is. With a brake light relay, it's gonna correct that issue and allow the lights to do what they need to do. So we have the relay on our truck and it's working properly. We have our brake light on on the right and the turn signal going on the left, so it matches the motor home.

And the same will obviously hold true with the right turn signal. So that's really all there is to it. You know, it's not a crazy component that you know, does a bunch of different things but it's really important to use one that way everything functions as it should. As far as installation goes, really not too bad. Worst part about it is you're working under the dash.

Thankfully with the Ranger you can pull a panel down and have a little more space in there. But, you know, it's something I suggest doing at the same time as your breaking system and your other components since you'll be in there anyway. But if you'd like to see how it's done feel free to hang around. We'll go ahead and hook it up together now. To begin your insulation, to get the brake light relay in, you're gonna be here on the driver's side, kinda working underneath the dash area.

It does help out if you pull down on your panel here to lower that down. Just gives you some more room to work. All these white clips ends up coming off, not a big deal, it just snaps back into place there. And if you want as well, there's a little metal guard here, you can take out a couple of 10 millimeter head bolts and bend that back out of the way. And it just gives you a lot more access underneath the dash. I already have this all hooked up and just from the lack of space, it's easier just to kind of show and explain how we did it. As opposed to step by step, you just see my hands in the way, essentially. But, brake light relay, there's gonna be five wires coming off it. A red, a white, a black, a blue, and a green. The green we'll not use. So I just kind of cut that in half and taped it back out of the way. The white wire, that's gonna go to a ground. And so what I did is just took an extra piece of white wire I had laying around, you know, used a butt connector to pair them two together. I ran it out into the engine compartment where I have all my other grounds. The red wire from the brake light relay, that's gonna get connected to the taillight circuit from your existing diode wiring. And so I just had a extra piece of brown wire again, ran that out into the engine compartment where our diode wiring is and we'll get to that in a minute. But we'll continue on under here. The black and blue wire from the brake light relay, that's actually gonna get connected into the cold side of our brake light switch. And that's where lowering the dash panel like we just did, really comes into play and makes it much more manageable to get to. So if you look at your brake light switch, it's just a switch that's connected to the top of your brake pedal arm. And the wire that you're gonna be using is purple with a white stripe. Pretty much holds true for all late model Fords, for the most part, the wire that you want if you wanna check it yourself, you can use a test light, you want that wire to only have power whenever you push your brake pedal down. But with that said, our purple and white factory wire, I cut that in half, shoved the ends of the insulation back. The side that is closest, so the wire that's closest to the switch, that's where you're going to connect the blue wire from the