Discussion Starter · #1 ·
I have a 2013 F350 Super Duty with factory towing package. Both the right and left tail/turn/stop lights work with no issue. The left side of my 5th wheel does not work when hooked to the trucks trailer connector. The left trailer lights work when powered with an alternate 12v source. The corresponding pins on the truck connector show no power for the left side. I've swapped the relays, 75 and 76 with no change in the problem. Any thoughts on where to go from here?