How Does Manual Override Lever of Brake Controller Activate Vehicle and Trailer Stoplights

Question:

i have a 2010 tundra with a prodagy p2 everything seems to work fine except the brake lights do not turn on with the manual override i used this same unit in my tacoma and it works fine i do have power at the controler on the brake light wire when i step on the pedal and i have power on the brake light wire at the controller when i use the manual override but no brake lights when i use the override only i have 2 wiring diagrams and neither show anything that should not allow them to work

asked by: GLENN C

Expert Reply:

The Prodigy P2 part # 90885 is designed to put 12 volts back onto the red wire when the manual override lever is slid so that the brake lights of the vehicle and trailer apply. You can test to see if your controller is doing this by using a circuit tester like part # PTW2993 on the red wire of the controller when you slide the lever. If so, then the issue is the wiring of your truck. If not, it's an issue with the controller.

expert reply by: Jameson C