I have a Zieman tandem trailer with surge brakes (2007) and the brakes are locking up on me in reverse. Brakes release when I go forward and fluid is good, was in heated garage all winter. Pretty sure it’s a wiring issue. Had to put a c-clamp behind the pin so it wouldn’t lock up. Any ideas on how to troubleshoot the wiring? I’m currently looking for wiring diagram online.
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