No power to camera and roof running lights, tail lights, fuses ok

Returned from the coast yesterday and camera didn't work all the way over and back. Tried to find problem and found that there is no power to the camera or the running lights and tail lights although lights on the Tundra work fine. I couldn't find a bad fuse in the trailer or the truck. Truck manual no help. No information in trailer manuals about wiring or fuses.
Any suggestions? Thanks for your time.

 

Problem solved. Don't know why. I pulled one relay and put it back. Rechecked all my fuses. Hooked up the trailer to take it to the dealer and ...then the camera worked just like it should, as well as the running lights and tail lights. Wish I knew what it was.

 

Hopefully it stays resolved for ya.

 

It could still be some type of short though right ? Maybe a little corrosion some where on a fuse ? Hey got any pics of your truck ?