Power Remains Constant with Turn Signal on Trailer Wiring for a 2003 Ford F-350

Question:

Stop/etc turn stays solid on tester and has power but it doesn’t blink when I use directional marker lights don’t work I traced the line all the way up to the dash no damage and tested at every plug juncture replaced all the fuses but I did not replace the relays once the wires lead up into the quarter panel i lost them not sure what’s left to do

asked by: Matt

Expert Reply:

This issue sounds like the factory trailer wiring module is faulty. In order to replace this you would need to take the vehicle to your local Ford dealer and odds are it will cost hundreds in repairs. However, in order to avoid a pricy dealer repair you can bypass the factory trailer wiring module all together by using one of our harnesses like the Vehicle Wiring Harness part # C59496 and the 7-Way RV and 4-Way Flat part # ETBC7 if you need a 7-way.

expert reply by: Conner L