How To Prevent A Towed Vehicle Brake Light From Overriding The Signal From The Motorhome

Updated 08/27/2021 | Published 05/06/2021

Question:

I have a 2016 Ram 1500. I will be using the Brake Buddy braking system when flat towing this vehicle. My brake lights come on when the pedal is depressed even with the key to the ignition is in the off position. Question is: Will this cause a problem when the Brake Buddy applies the brakes, and lights the brake lights at the same time the motorhome sends a signal to turn the brake lights on? Will there be 12v coming to the same light from two different sources?

asked by: Tony L

Expert Reply:

You're needing a Roadmaster Brake-Lite Relay Kit for Towed Vehicles # RM-88400 to prevent your 2016 Ram 1500's brake signal from overriding the turn signal that comes from your RV. When your towed vehicle is properly wired and connected to your RV, its indicator lights will illuminate as you engage the turn signals in your RV. However, if you have only a four-diode system in place, the turn signal will be overridden by your towed car's brake signal as soon as your supplemental braking system presses the towed car's brake pedal. As a result, drivers behind you know only that you're slowing down and not that you are turning.

expert reply by: Kevin C