Was getting ready for a weekend trip up the coast. When I went to test the electrical between my GMC truck and Forest River Roo trailer (7-pin), the front running lights on the trailer illuminated, but the rear running lights, turn signals, and brak...
Thanks. Silly question, how do I check for the ground on the truck side? Yesterday, after I changed the LT signal fuse, I grounded the voltmeter to the truck frame and tested the LT, RT and brake signals and got strong readings. Does this tell me ...
