joefrog

Pulled my camper for the first time with my new truck this weekend. The running lights and brake lights are suddenly not working. I'm thinking "fuse," but why now, on a new truck?

Any tips on where to start?

Thanks!

humblerb

Most likely a fuse.
Just to save some aggravation, check and replace it your self.
If it blows again, and you have been pulling the same trailer with a different vehicle and no issues, take it back to the dealer and let them figure it out. Has to be a short for all the lights to just go out at once.