Photobug
Well-known member
Are you suggesting the factory trailer wiring is not fused from the factory?
I don't know about his ram but my chevy has a bunch of fuses in the fuse block just for the individual trailer wires.
When i added a topper to my truck I tapped into the fifth wheel wiring harness to run a couple dome lights. That 12v constant on wire is 10 guage and fused at 20 amps. And yes voltage at that wire is usually a couple tenths lower than battery voltage.
My bad I thought he added a new 7 pin wiring to power the back of his truck power needs. It looks like he tapped into the existing 7 pin. I would assume it is fused from the factory, likely in the fuse panel. I had my topper professionally installed and they ran a dedicated fused wire to the back of the truck for a light in there.