The chassis batteries on my 2005 Alpine Coach discharge (down to 5 VDC ) after 4 days of being parked and plugged into shore power.
The House Batteries stay OK at 13.6 VDC.
This only happens some of the time - not everytime.
I put a knife switch on the positive terminal of the chassis batteries and I now disconnect them when I park and plug into shsore power. I have also been hooking up a battery charger to the chassis batteries. This solves the problem but I don't know what the problem is.
I am looking for ideas as to why they discharge even when connected to shore power.