2 new 6 volt batterys only 3 months old. We went on short trip when new batterys were installed,came home and parked,Everything seemed to work O.K. I went to use the coach today and here's what I found. No power at any 12 volt lamp, nor will the fans in vents work or the panel of lamps for checking the holding tanks,water pump. But if I start gen. everything works fine! Being the batterys will start the gen. what should I check-out?
It's a 2002 Fourwinds 5000 on a E450 V10 . Thanks for any advise