How do you troubleshoot trailer brakes with a multimeter?
How do you troubleshoot trailer brakes with a multimeter? To determine if a brake magnet has an internal short, touch the base of the brake magnet to the negative post of a 12-volt battery. Then, connect one of the brake magnet wires to the negative lead of a multimeter and the positive lead of the multimeter to the positive post of the battery. Why do trailer brakes not work when in Park? The most likely problem is that the controller is not getting the input that the vehicle brakes are being applied. When the trailer is hitched up with the...