Trailer Lights

OK, So I'm getting my boat out of the garage and hook up the trailer. The lights are not working, so I replace the bulbs, no help there, no voltage at light sockets. Go to the connection at the rear bumper and no voltage at the connector. My brake lights and running lights work on the truck but can't find if there is a fuse for the trailer lights. I would think that if everything is normal on the truck then I should have voltage to the trailer connector at the rear bumper. Am I missing something here? /ubbthreads/images/graemlins/shrug.gif