Quote:
Originally Posted by BoosTT
I did a bit of research on this and the likely cause is a bad ground. Oddly enough I had to replace a ground wire in the camping off season. 
So, I guess the trailer battery should not effect the trailer brakes. |
You're right, the trailer batter should not affect trailer brakes (except for the breakaway switch if it's connected to the trailer battery)
The first thing to check, I think, would be the brake magnet wires where they connect to the trailer wiring harness. Usually they are just wrapped together and a knurled electric nut twisted onto them. It's real easy for that connection (there should be 2 wires on each wheel) to corrode. I've seen brakes on new trailers right from the factory with corroded wiring.