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When you’re flat towing, it’s important to know what your towed car’s brakes are actually doing—not just what the braking system thinks they’re doing. This Stop Light Switch Kit activates your motorhome’s brake-monitoring system whenever the towed car’s brake pedal is pressed. Instead of relying on signals from an air cylinder, it reads the pedal itself, giving you an accurate picture of what’s happening in real time.
If a supplemental braking system is set up wrong, it can keep pressing the pedal even when it shouldn’t, wearing out your tires or brakes. This kit eliminates that risk by giving clear, direct feedback through your RV’s monitor whenever the pedal moves. You’ll know right away if something’s off, so you can fix it before it causes damage.
The kit wires straight into the towed car’s fuse box to ensure a constant 12-volt current. That direct power source keeps the system dependable every time you tow, without relying on temporary connections or accessory circuits. It’s a clean, integrated setup built for reliability.
Some vehicles don’t have a “tow” position in the ignition, which can make monitoring the brakes tricky. This Stop Light Switch Kit solves that problem by working independently of ignition settings, so you still get accurate brake signals and full peace of mind every time you’re on the road.
Flat towing can be a much more convenient way to take your car RVing with you than using a trailer or a tow dolly. It'll save you storage space both at home and at the campsite, and it takes less time and hassle to hook up.
To flat tow your vehicle, there are 5 basic components you're going to need: a tow bar, a base plate kit, a safety cable set, tow bar wiring, and a flat tow braking system.
| For the RV | Between the RV and Towed Car | For the Towed Car |
|---|---|---|
| Hitch | Tow bar | Base plate |
| Wiring plug | Safety cables | Braking system |
| Wiring adapter cord | Wiring kit/diodes |
The custom-fit base plate installs on the frame of your toad so you can connect the car to your RV with a tow bar. Hook up safety cables between the vehicles to ensure that the toad does not separate from the motorhome if the tow bar becomes detached. Tow bar wiring syncs your vehicle's signal lights with your motorhome's tail lights, as required by law in most states. Finally, the flat tow braking system - also required in most states - activates the brakes in the toad when you hit the brakes in the RV, making for smoother, safer braking, and preventing wear on your motorhome.
Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.
Hi, everyone. Steve here with etrailer.com. Today, we're looking at our Roadmaster stop light switch kit. Now, this is a custom fit application, so make sure you're checking our fit guide here at etrailer.com. Be sure you're entering year, make, and model, sub-models, any kind of things it asks you to be sure you're getting the right parts the first time. Now, if you're not sure, basically, this activates your motorhome's brake monitoring system whenever your brake pedal in the towed car is applied.
And then, it talks to the RV, saying, "Hey, I'm working, I'm working," and basically tells you that it's working properly. You obviously get the brake light switch here. All of that kind of stuff is pretty universal as far as the in fuse. In-box tap fuse adapter here, sorry. This will basically plug into your fuse box, and then the fuse will go inside so that you don't have to cut or splice.
And then, you do have these two wires. Obviously, you'd have to wire them up to this part, but you're not cutting or splicing the main vehicle. Now, this bracket is gonna be the main custom part that's custom to, in this case, that Jeep Wrangler 4xe, so just keep that in mind. Now, everything here is a direct fit for that vehicle and it works great if you don't have any tow position in the ignition on that specific vehicle. Folks, that's gonna wrap it up for our look together.
I'm Steven, again, if you have questions about this or any of our other products, feel free to reach out to us. We'll be more than happy to assist you. Have a good one.
Ratings & Reviews
Victoria H.
1/14/2025
That's quite impressive Fred, nice ride!
Fred
1/8/2026
Everything works just fine! Great product and support! Thanks E-t
Josh B.
1/8/2026
Alan
9/8/2026
Its been a year and to be honest, I never have to think about my tow setup. Its there, it works perfect like the day I got it. I cant recommend this any higher. Smooth towing without worrying about it.
Lazer S.
9/8/2026
Kate F.
12/17/2025
I wish you could mount it there Donald, but those stop-light-switch studs are only designed to hold the switch bracket. Adding the pulley bracket changes the spacing and alignment, which can make the brake lights stay on, not come on, or throw off the Invisibrake’s operation. The studs also aren’t meant to handle the side-load from the cable, so Roadmaster doesn’t recommend using them. For drilling stainless, the trick is a cobalt bit (M35 or M42), slow speed, steady pressure, and cutting oil so the metal doesn’t work-harden. Are you new to flat towing, or just getting a different vehicle set-up?
Michael R.
1/18/2024
Still working great
Mark S.
11/3/2025
Its a good choice because its easy in easy out. I have two jeeps that can flat tow, so i was covered for braking in either one
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Kate F.
4/23/2026
Thank you for the detailed review and for sticking with the install George. That is a tight space to work in, and we really appreciate you sharing both the challenges and your thought process along the way. You make some very valid points about the alignment sensitivity and adjustability of the switch. I agree, that kind of precision fit without an easy lateral adjustment can make the install more tedious than it should be. It does not make it right, and feedback like this is exactly what helps highlight areas for improvement. It is great to hear that it has been working reliably for you over a few thousand miles so far. Your habit of checking function during hookup is a solid practice and definitely the way to go with setups like this. I will be passing your feedback along to the manufacturer for review, especially your notes on the switch design and mounting adjustability. Also, thank you for including photos even with the tight space. They are very helpful for others tackling the same install.