All ActivityMost RecentMost LikesSolutionsRe: 12 volt mysteriesthanks for everyones help. unfortunately, still no joy. with a/c from the generator the thermostat works the roof air and the lights, fan, etc. checked the dc pop up breakers and all seem to be good. my rv is a 1999 itasca sunrise so maybe the converter is, as suggested, not up to par. but if the converter is not working properly would that no make all the 12v fans, lights malfunction as well? still puzzled.12 volt mysteries12 volt lights, fan , furnace, levels readout do not work. 12 v batteries in good condition. Lights , etc. work with generator.. When I turn radio switch from main to aux and switch to aux power the radio works , when I turn off the auxiliary power the radio stoops so I am assuming that power from the house batteries is getting to radio but the lights, fan, levels readout do not function on 12v. Theb12v pop up breakers have not popped so what can be going on? Any suggestions would be appreciated since I certainly can't figure this out. Thanks for any help.