Coach battery/Generator

Kemer, if I read your post correctly, you aren't all that familiar with your own coach. IIRC, you have three wet lead acid batteries and they should be checked for water periodically. You should run your generator at least once a month for 30 minutes or longer and under 1/2 load. So yes you have "WET" batteries and they may well be damaged from loss of water. Your rig could be 4 build years old and if maintained properly should be good for at least that long and probably 6 years if really well cared for.

I'm not a battery guru like some of these guys, I am a battery user and learned the hard way to maintain my batteries.