westend wrote:
Bring out the multimeter and see if you have voltage to one of those wires. They may both be for the brake leads and you may have to supply a power lead. If you have power to one of the wires and no power to the other , connect them, as posted, to the break-away switch and check to see if your brake magnets are powered by pulling out the pin. You can do that with a stud finder or compass at each drum. Have you checked your trailer's brakes using the truck's harness?
Ya I have my P3 controller hooked up and the brakes work with the harness connected.
I will test this in a bit and see if I have power to one, if so I should be good to go.
