As per previous post i am still wondering why i have no 12v power when not connected to power source.new 27 series battery,does not have 3 way switch by lift ring.u ftftp and down only.Works only with converter.1992 fun lt 25 ft.

Start by checking for a fuse around your battery area. Some are self resetting others you have to reset.

__________________
"Ruben"
2404T, 2003 2500HD 4X4 GMC Sierra SLT Crew Cab w/Astro camper shell and 2003 Chevy Tahoe LE 4X2
Far West Texas

Going back to your original post, what all things did you test that were recommended?

__________________
My Great Wife Joyce
2018 Jayco Jay Flight 21QB
Formerly owned 1705T and 2310H
2012 F150 4X4 SuperCrew EcoBoost w/Leer Cap
Reese WD Strait-Line Hitch
Amateur Radio K3EXU

Did you get it fixed? I had accidentally pulled the breakaway switch and it drained the battery and popped a breaker near my 12V fuse panel. It was in a spot almost invisible underneath the converter, I reset it and had power. I also rotated it 90 degrees to make it visible.