How do put a post on this site ? I have a 3001 Starcraft pullout pop up camper . Everything works when plugged into house .. batter deep cycle and full charged .. all fuses good all wiring good . Centurion 3000 converter all good breaker and fuses event the glass one .. fan seems to be working but very quite .. someone told me about the switch inside that tells camper to use 12 volt or house cirrent . Switches back and forth .. and I should here some sort of click when switching .. I am simply trying to get interest lights to work off battery .. thoughts