dougrainer wrote:
I have never in 42 years had a Back feed. BUT you are correct. To do the test with more safety, disconnect the 7 way plug and then pull the lanyard. Doug
Even simpler, just crank the controller to max and use the lever to activate the trailer brakes while going forward. (Remember to return it to normal setting before travel)
We do this every time when leaving a site (minus the max setting). If I don't feel the brakes grab, I can stop and address the situation.
But really, the OP knows there is a issue, so getting the multimeter out makes far more sense, so he can track down the real problem.