Low Batteries After Storage

[Dufort]

I keep my 2016 Toy Hauler winterized in the shop during Winter, plugged into "shore" power to maintain the batteries. Getting ready for a trip today, I found the batteries at 5 volts. Obviously, they didn't maintain over the past months. The factory (push/pull) switch was in the off position. My question; Does the converter maintain a battery charge when this switch is off? Or is the switch position irrelevant and I have another issue?

[jxnbbl]

I don't know the answer but a true battery disconnect would disconnect the batteries and only allow possibly solar to bypass imo.

[rhagfo]

Ok shore power the battery disconnect should be in the oON position.

[Carl n Susan]

THe converter can't charge the batteries if the switch is disconnected (you can remove the red key).