blown fuse

I was replacing my front top marker lights on my 2001 Artic Fox truck camper. I think I blew a fuse because none of the exterior running lights or brake lights, etc. are working now. I even put the old lights back. Does anyone know which fuse and its location that controls those lights. I have a 2001 AF TC 1080. I can't find a blown fuse on the panel under the step down inside the camper, and I have voltage at the truck plug.

Thanks, hope I'm in the right forum.