Our battery in the RV went down this weekend and wouldn't stay up while running down the road. I checked it once back home, and with the switch in "Store", the battery puts out about 8.5 volts whet...
I hope you are aware that the so called disconect switch disconects pratically nothing! Purchase a marine type disconect switch and install it next to the battery, one that disconects everything for storage, that should help.