We were in our PUP last night and everything was working great. Go out tonight and the interior lights won't come on. AC works, outlets work. Checked fuse, checked and changed bulbs, checked breaker, checked switch, checked connectors going to ceiling, checked wiring underneath for damage, checked voltage with VOM and getting 0 volts from each overhead lamp but 120 from outlets. Any suggestions. Everything was working 24 hours ago! We have not moved anything.