Had that issue and when I pulled the switch I found one of the wires had never been seated properly and had worked it's self off, reseated and fine. I don't remember for sure, but there could have been an in-line fuse in the line just below the switch.
I have found several in-line fused hidden behind the walls.
Michelle & Ann
2018 Chevy 3500HD Crew Cab High Country DRW, D/A, 2016 RW39MB, Dual ACs, Auto Level, Auto Sat Dish, Stack W/D, King Sleep #, 17.5" Sailuns w/Disc, MORryde IS & Pin, Comfort Ride Hitch, 5.5 Onan, Res Fridge & Induction Cook Top