All Light Flash with Turn Signal Engaged Using In-Bed 7-Way Trailer Wiring Harness
Question:
A few years ago your co installed a hitch in the back of my truck, Demco, with 5th wheel wiring. we have had no issues until today. when I hook the wiring from the camper to the truck it doesnt work. let me explain, I checked all fuses, and grounds. I replaced one fuse. same problem. I replaced the wire harness from the camper [7 point]. same problem. when the vehicle is running, the flasher button engaged, all the lights flash. turn off the flasher and turn on the left blinker everything flashes. turn on the right blinker it is dim. press the brakes all the lights come on can you help
asked by: Stephen B
Expert Reply:
The first thing I would check is to see if there is any corrosion on the pins inside of the in-bed/bumper 7-way as well as the t where the in-bed 7-way connects to the bumper 7-way. I wound also check for wire shorts on as much of the harness as you can. I didn't catch what tow vehicle you have but some in-bed 7-ways can be pinned differently so it will be important that you have the correct in-bed wiring harness. If the in-bed 7-way operates in the same fashion as the bumper 7-way then this could be an issue with the body control module (BCM). If that is the case then you would need to take your truck into a service center for repair.
