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When you’re towing, guessing whether your supplemental braking system is working can lead to damage or dangerous stops. The Roadmaster Stop Light Switch Kit ties directly into the towed vehicle’s fuse box to send a true brake signal to your motorhome’s monitor system whenever the pedal is pressed. Unlike systems that only read air cylinder movement, this one reads the actual pedal position so you know the brakes are really being applied. It’s a simple 12-volt setup that gives you confidence that your braking system is doing its job every mile.
An improperly set up braking system can keep pressure on the pedal even when you’re not braking, wearing down tires and the braking system itself. The Stop Light Switch Kit helps you avoid that by accurately detecting when the pedal is depressed and when it’s fully released. If something is misadjusted or the brake is dragging, you’ll know right away through your monitor, so you can fix it before costly damage occurs.
The kit wires directly into the fuse box for steady current and includes a custom mounting bracket that fits right where it should. Reviewers liked how the bracket lined up and how the switch could be easily adjusted for depth, even in tight spaces under the dash. Once tightened down, it stays put and gives a solid, consistent signal every time you hit the brakes.
Many newer vehicles no longer provide a usable stop light circuit, which makes this kit essential when adding a supplemental braking system or wireless monitor. It’s designed to feed the proper brake signal to your RV’s indicator light or wireless transmitter, keeping everything synchronized. For anyone setting up a complete flat-tow system, it’s the missing piece that makes the whole braking connection work smoothly.
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.
Customer Satisfaction Score:
93% were satisfied with this product
7% of customers were not satisfied
Ratings & Reviews
Jenny N.
12/16/2021
I recommend looking at the video installation that we have on a 2015 Jeep Grand Cherokee starting at mark 2:18. You can see the bracket location and that it uses a five sixteenth by three quarter inch bolt.
Gregory
9/6/2023
No issues since installing, if I change vehicles I would buy this again.
Mike L.
10/28/2023
Peter
5/27/2025
Braking system still working well!
Jerzy
2/13/2023
Roadmaster Stop Light Switch Kit Item # RM-751449 I installed it myself, works fine Thanks
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Joe B.
1/28/2018
Really good.thank you!!