Finding Stoplight Circuit on 2004 Holiday Rambler Endeavor for Brake Controller Install

Question:

The problem is that the circuits lose voltage when the pedal is applied and this suggest to me that the brake light relay has constant voltage applied to keep it in open circuit, thus when the brake pedal is applied the brake circuit is closed by the lack of voltage. A rather complicated way to accomplish brake lights. I will try your suggestion and give you further follow up. Thanks for your assistance

asked by: David G

Expert Reply:

Your 2005 Holiday Rambler Endeavor is built on a Roadmaster Motorhome chassis which inconsistently has brake controller wiring like you have found. Since you can't find the stoplight signal wire the best option is to use a circuit tester like part # PTW2993 to test all of the wires that run to the brake light switch circuit on the brake pedal till you find a circuit that carries voltage only when the brakes are applied and use it to wire to the red wire of your brake controller and you'd be set. The switch on the brake pedal is what tells the stoplights of the RV to apply which is why the circuit you need happens to be there.

expert reply by: Jameson C

David G.

10/9/2019

Jameson C.

10/9/2019

For vehicles where it's nearly impossible to find a dedicated stop light circuit the Roadmaster Universal Stop Light Switch Kit # RM-751000 is a great solution which would work well for your RV. Basically it gets power from your battery and has it's own switch that you install on the brake pedal which will then give you a dedicated stoplight circuit.