Odd...no idea. I guess I'd look at the fuse, replace it. Look at the wiring, though not so sure how easy that would be to see the connections behind the DC fuse holders. I've pulled the load panel, but only to deal with the AC side.
Which fuse is it, that you are wiggling?
2007 Jayco Jay Flight 26BHS
2005 GMC YukonXL Denali
4 6-volt batteries - 440 AH bank
Magnum Energy MSH-3012 Tri Metric 2025
Yamaha EF3000iSEB generator
Winegard Traveler DirecTV slimline HD SK-3005