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Roadmaster Stop Light Switch Kit Installation - 2018 Jeep Cherokee

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How to Install the Roadmaster Stop Light Switch Kit on a 2018 Jeep Cherokee


Today on our 2018 Jeep Cherokee, we're gonna be taking a look at and showing you how to install the Roadmaster Stop Light Switch Kit. To help us with our installation, we're gonna be using the Buyers Dual Fuse Holder for ATM micro fuses.Whenever you're flat towing your Jeep, you wanna know what's going on behind you. Well, that's why our supplemental braking systems have monitor life and they let us know what's going on, but those are usually read off of the cylinder pushing on the brake pedal. It doesn't exactly tell you where the brake pedal is positioned. So if it's not installed correctly, the brace could be applied all the time causing a lot of damage down the line.But by using this Roadmaster Stop Light Switch, we're gonna be able to see where our brake pedal's actually positioned, rather than the braking system position. That way we know exactly if our brakes are being applied, if something may have fell on the brake pedal while we're towing our Jeep, or any case we know exactly what's going on.Our Stop Light Switch is gonna mount right onto our brake arm and it's gonna have a little plunger that's gonna activate or deactivate depending on how hard we push on our brake pedal.

Our brake switch is gonna wire directly into our fuse box using a fuse tap. That way, even if our car's in tow mode, the engine's off, we're still gonna have power into that brake switch so when we're towing our Jeep, we know exactly if the brakes are applied or released.Now keep in mind, that's only gonna be one component you need for a complete, safe, flat tow set up. For a complete set up, you're gonna need a base plate, a tow bar, tow bar wiring, a braking system and finally safety cables.As far as the insulation goes, it is gonna be a pretty straight forward installation. The hardest part, really, is gonna be getting underneath the dash, getting access to everything and then making our adjustments. But now that we've seen what it looks like and gone over some of the features, let's show you how to get it installed.To begin our installation, we're gonna come to the front driver's seat and we'll find our brake pedal.

Now, we're gonna wanna follow the arm up, all the way to the firewall. Against the firewall, we'll find four bulbs that are attaching our brake booster, that's also connected to the arm. So you look at it, at the top left, you wanna remove the bulb right here. It's gonna be a 13 millimeter head, so we're gonna have a 13 millimeter socket and pull that nut out. Will help if you use an extension, make it a little bit easier to reach in there and loosen it up.

You wanna make sure that the hole is still lined up with the brake arm after we tighten it up. Now that we know that it is still lined up, go ahead and tighten it up all the way.Now we're gonna take our brake switch and we're just gonna loosely put it through the bracket here, then we're gonna put our star washer and secure it down with our Hex Nut. We just wanna get it in there real loose, just so it won't come out all the way when we can make our final adjustments later.Once you have your Switch in there, we're gonna have two wires that are coming out of the back. Now in our kit, they're gonna provide us with some green and some red wire and we're gonna be attaching these to the two black wires coming out of our Switch. We'll take one of our wires, strip back the end.

Strip the end off one of our wires here. Grab one of the included butt connectors from our kit, we'll crimp it in place. We'll do that for both of our wires, extending them both out. One with the red, one with the green.Now it doesn't matter which one you use, you're gonna use the red or the green, but we're gonna start out using our red wire and this is gonna be our power source. So we're gonna need to send this either to the engine bay or if we can find a fuse panel inside, we're gonna use this to tap into a fuse, getting some power.Now fortunately for us, we already have some wiring going through a grommet right over here. So we use that wire to pass it through to the engine bay. Now here's where you can see where my wire came through on the other side of the firewall. It's gonna be on the outside, on the driver's side, pretty high right by our brake booster.I just use an airline tube, take my wire to it so I can poke it through that grommet and then pull it all the way through.Now that I'm wired through the firewall, we'll come to our fusebox. Should be right behind the battery on the driver's side. Press on these two tabs and let the top off. I'm gonna be taking my circuit tester, I'm gonna be testing all the fuses here and I wanna find a fuse that has power when our Jeep is in tow mode. So I'm gonna go around, I'm gonna start checking my fuses to see which one has power. Then I'll check my diagram to see which fuses is what, and what circuit is gonna be working.We have a couple over here, we have a few 20 AMP fuses we can choose from. So we're gonna use this 20 AMP fuse here. If you're wondering, this is spot 80 and it's gonna be a 20 AMP fuse for the radio. So we're gonna go ahead and pull this fuse out. Use the fuse puller, grab a pair of needle nose pliers, either way we wanna make sure we pull that fuse all the way out.Here's the fuse tap that's gonna come with your kit. This is for a mini fuse, but as you can see we have micro fuses in our Jeep, so they're not gonna fit in there. So we're gonna grab a micro fuse tap, use that and we're gonna take the factory fuse that we've pulled out and we're gonna put it in the slot closest to the terminals on the tap itself. Just put 'em in and press pretty good to make sure it's all the way in there.Now you already need to grab a tap fuse, because again the one that comes in your kit's not gonna be the right size fuse. But we'll take the 10 AMP fuse, we're gonna put it in the slot right next to the factory fuse. We're gonna estimate about how much wire we're gonna need and pass it into the fuse box. Go ahead and cut off the excess. We'll strip back the end of it. We take our fuse tap, there's already gonna be a butt connector installed on the end of it. We'll slide out wire over. Then we'll crimp it in place.We're simply just gonna take this terminal's on our tap and plug it back into the fuse slot, just like we would. Then we just tuck all the excess wire into the fuse panel here. Now the switch has power, we're gonna have one more wire left. Now this is gonna be the output wire, so if you're hooking it up to supplemental braking system, this wire's gonna extend out to your monitor light. However, if you're putting it in even braking system, like we have here, this is gonna be going to the number one terminal spot.So I might go ahead and strip back the end of my wire. Now our kit is gonna come with a Spade Terminal, I'll go ahead and crimp that in place. Now I'm gonna leave this wire unplugged for now, because I am gonna still have to adjust this switch itself. That way I can hook my tester up and see what position I need to adjust the brake pedal to.Now when we need to adjust our brake switch, we're gonna use a 17 and a 14 millimeter wrench, and we're going to adjust those two nuts. Either draw the brake switch back or push it in so that whenever we press on the brake pedal and we have a tester hooked to the end of the wire here, when we press on the brake pedal, it'll activate the light. Since you wanna have a little bit of play in there. You want it to come on, not just barely resting on it, you want it to have about an eighth inch to a quarter inch of play for you can see, we still need to adjust ours a little bit because it comes on almost instantly. So you just want a little bit of play and then we'll tighten up the two nuts permanently.Now it is gonna be rather hard to get your wrenches in here, but once you get everything pretty close to where you think it is, we're gonna tighten up those two nuts against using a 17 and 14 millimeter wrench and this is about how much play you wanna have. You can see, I have my tester hooked up just to make it a little bit easier for you to see and hear. So I'm just gonna push a bottom eighth of an inch down. You can see right after that little bit of movement, our brake pedal comes on.Now we can take our Spade Terminal in our install, we're gonna be hooking it up to our transmitter here. Again in your case, you might be hooking it up to a different style, or a different braking system. You just wanna make sure that the green wire goes to the output for your monitor light.Now we can take some time, clean up all the wires underneath the hood as well as underneath our dash here. That'll finish up your look at the Roadmaster Stop Light Switch kit on our 2018 Jeep Cherokee.


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Info for this part was:

Employee Joshua S
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Joshua S
Employee Chris R
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Employee Dustin K
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Employee Jonathan Y
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Employee Robert C
Test Fit:
Robert C
Employee Ryan G
Test Fit:
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Employee David F
Installed by:
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Employee Michael B
Installed by:
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