Not sure of the brand of mine, but it looks similar to yours. Mine is off when it is in the position yours is in the picture. Also, even with a dead battery, if you hook your connector to your truck it should get juice from it to at least test the switch.
As far as the fuse, on mine it kills everything inside the camper when I pull it. The radio still keeps the stations on memory, but not the time.
2005 Dodge Ram 1500 Quad Cab 5.7 HEMI
2̶0̶1̶4̶ ̶J̶a̶y̶ ̶F̶e̶a̶t̶h̶e̶r̶ ̶X̶1̶9̶H̶