Brake Controller has Power Output When Vehicle Headlights are Turned On

Question:

I have a Prodigy brake controller. When the headlights are on, I get a reading of about 1.5. This is when no brakes are applied. Is this normal, or could there be a wiring problem? Thank You

asked by: J. D

Expert Reply:

What it sounds like is that the red wire on the brake controller is not connected to the correct wire on the brake switch above the brake pedal. To find the correct wire, you will need a circuit tester like # PTW2993 or multimeter like # PT89ZR. Find the wire that carries a signal or voltage ONLY when the brake pedal is pressed. There should not be a signal or voltage at any other time. So, if you find a wire that carries a signal when the brake is pressed but also has a signal if the lights are on or the turn signals are on, it is not the correct wire.

expert reply by: Michael H