Bad things happen when you go to trailer places... i would know i had to fix a few after customers went to places they bought thier travel trailer campers, or dump trailers, etc. Ford OEM harness's for tbc i can get a a complete wiring diagram but i dont know how to post it to here. We are known for the module itself to go bad, corroded pins, and simple fuses blowing. and depending on how the trailer itself is wired for brakes. OEM modules ONLY work with straight electronic brakes, not electronic over hydraulic, when a trailer is set up with electric over hydraulic the only way you get some trailer brakes is when you slide the gain to max for emergency stops only.