GFCI has nothing to do with the lighting, they are all 12 volt. My last 5er had several lights not working & found that they were wired in series & the wire nuts were loose on one of them so all past that wouldn't work.
I'm not going to track down until tomorrow but may not be too terrible. I was outside and looked under the bunk slide. The wires to bunk lights go in to area around power panel. Just have to follow it. There should be a split where it goes to overhead light. Problem should be between that junction and fuse box. That's what I hope anyways lol.
Had the same issue in our main slide-out. Turned out to be a failure in the circuit for the slide, on the converter. I switched the positive lead from the terminal marked "slide" on the converter to a "spare" terminal and moved the fuse, no more problems in the last 2 years.
🇨🇦 Scott & Janie 🇨🇦
2004 Dodge RAM 2500 CTD (slightly tweaked)
2011 Cruiser 31RK
Cooper the Golden Retriever, and
Sam the black lab.
The wire going underneath slide out was pinched and severed. It's the wire for the personal bunk lights. I noticed the flex loom was pinched. There's pieces of plastic that keep up wire and they slid out of place. Thanks all.