Trailer Wiring Fault Message on Tow Vehicle and Brake Controller Shows Trailer Disconnected  

Mobile suites 36 ft 5th wheel. I just replaced all four wheel bearings and brake assemblies. They are wired almost exactly like your diagram except I crossed from driver side to curb side at each axle. Brake assemblies are Dexter. 7 pin ford factory pin has a green power and white ground at the 7 and 5 oclock position on the plug in. The trailer plug cable has the white spliced into a white ground wire and the green spliced in to a black power wire. The white and black then run as a sheathed pair down the driver side of the trailer. The assemblies are connected to the white and black without regard to power/ground, I understand it makes no difference which wire from the assembly goes to white or black. Once I had everything hooked up I set up to burnish the brakes as described in the literature from Dexter. Soon after I began getting a WIRING FAULT ON TRAILER message. I found a fault on the front axle and corrected it. I found no other fault. Still I get the fault message at times and the TBC trailer brake controller will not activate the brakes. This is an intermittent condition as sometimes it will se the trailer and work as it should and other times it will give me a trailer disconnected message followed by the fault message. Finally, when hooked up and in use the brakes seem to work. The trailer is heavy and I would know if the brakes werent working. Brake pedal cannot be checked until truck speeds exceed 12 MPH. In checking the wiring I have continuity between the white and blue wire. That seems strange but I guess if the magnets are wired without regard to polarity that would be correct. Am I right about that. I am certainly open to suggestions from an expert, Thank you

asked by: Stanley