Can a trailer brake controller go bad?
Use a circuit tester, and check the red wire that exits the rear of the controller. This wire should only go hot when the brake pedal is pressed. If this checks out ok, then the controller is bad and must be replaced. The P2 is a proportional controller for safer, more predictable braking.
Why is my trailer brake controller not working?
Check the wiring connection at the tow vehicle’s positive and negative battery terminals if the brake controller displays signs of no power source. If there is less power at the trailer connector than at the controller, check for issues with the wiring between the two components.
What would cause trailer brakes not to work?
The most common electrical problem is low or no voltage and amperage at the brakes. Common causes of this condition are; poor electrical connections, open circuits, insufficient wire size, broken wires, blown fuses (fusing of brakes is not recommended), improperly functioning controllers or resistors.
How many wires does a trailer brake controller have?
Most brake controllers have 4 wires, blue (brake output to trailer brakes), white (ground), black (12 Volt power from vehicle battery), and red (stop light switch). If your brake controller is not on, make sure the black power wire is connected to the vehicle battery via a 20 or 30 amp circuit breaker.
What kind of breaker do I need for black brake controller?
Verify that the black brake controller wire (12V power function) is connected to the positive battery terminal with a 20 or 30 amp circuit breaker installed in line. For trailers with 2-4 brakes, use a 20 amp breaker and for trailers with 6-8 brakes, use a 30 amp breaker.
How do I test the blue wire on my brake controller?
If your brake controller is receiving power, set the power gain to maximum voltage and sever the blue wire about 6 inches back from the brake controller. Using a circuit tester, like part # 40376, test the blue wire for power when you activate the manual override of the brake controller.
Why is my brake controller not connecting to my trailer?
Brake controller display does not show that trailer is connected. Short on brake signal wire, trailer or vehicle side. Corrosion in trailer and/or vehicle plug. Short on brake magnets on trailer. Malfunctioning brake magnet (s). Brake controller loses connection to battery ground.