Maybe U-Haul has a universal (wires only) Control Module so they don't have to stock a dozen different connector types. Those 'cut wire, snap on' splices are common. Sounds like you have a Plan. Gla… (View Post)
@michaelroyy; Does sound like good progress. Hopefully your finding the +12VDC Fuse Holder to the RT Blade continuity on the 7-pin was just an operator error. As probing into the 7-pin can get confus… (View Post)
@michaelroyy ; If your 4-pin testing suggests the Trailer Control Module is bad - - - Before you order a replacement, suggest you remove the wheel well plastic cover, as at least one brand, Curt, aft… (View Post)