Posted 2014-11-13 2:39 PM (#161549 - in reply to #161547) Subject: RE: Lights
Expert
Posts: 5870 Location: western PA
Check the truck's plug receptacle at the one o'clock position for 12 v. If there is none, check the truck's fuse box for a blown fuse. If it's a Ford SD, it will be the fourth maxi fuse from the front on the engine side. (30A) Also if it's a Ford, the key will have to be ON and if it's a diesel, some years only power the circuit when the motor is running. If that doesn't work, dissemble and check the trailer's plug at the same location for a loose or broken wiring connection.