Do All Trailer Brake Controllers Use the Same Wire Colors and Functions

Updated 09/04/2018 | Published 09/01/2018

Question:

Are all controllers wires white ground black power. Red and blue

asked by: Bill

Helpful Expert Reply:

Yes, one of the few consistencies in trailer-related wiring is that all trailer brake controllers such as the Prodigy P3 # 90195 use the same 4 wire colors for specific functions.

The controller's Black wire connects to the vehicle battery via a 20- or 30-amp breaker for operating power; the White wire is ground; the Red wire takes in the brake switch signal from the cold side of the brake light switch and the Blue wire delivers the controller output signal to the 7-way socket on the vehicle.

This wiring setup is shown in detail in the linked article and photo.

expert reply by: Adam R