winesalot
Junior Member
I have a gooseneck trailer that has electric over hydraulic brakes. The hydraulic pump requires the 12V hot wire to work and it is not energized. I checked the 40 amp fuse under the hood and swapped the trailer power relay with the blower relay. Still no power at the truck side of the plug. Any Idea what has failed?
What triggers the relay to close?
What triggers the relay to close?