I have a 2004 Safari Zanzibar (Class A) Monaco mfg. I turned on all the 12 volt interior lights and after 20-30 minutes the overhead florescent lights and the passenger side lights suddenly went out....
Double check your 12 volt DC power distribution panel for blown fuse on icoming side. Check in the power compartment for two 12 volt circuit breakers that feed the power distribution panel. These are the small one inch square in most cases with two 5/16 studs on each.