All three batteries dead.

[monaco t]

2 weeks ago, I visited my 2020 entegra emblem to start it. all went well. Ran it for awhile till it warmed up. Today I went to do it again and all 3 batteries are dead. Chassis reads 5.2 V House read 2.2 V each. If, and I mean if I inadvertently hit the inverter switch it would fire up the fridge and eventually kill the house batteries (Glass mats) But not the chassis battery. Any ideas would be appreciated.

[Winemaker2]

Obviously something else still drawing chassis as well as house.
If you dont take it for a 45+ min ride no point in starting. It won't ever come to operating temp sitting.
Run gen if needed to charge battys but even then add enough load to get to roughly 50% load.

[oneknight]

If you're in a cold climate and can't plug in, it's best to just pull the batteries and take them someplace warm, and put a battery tender on them.
Let the coach sleep in peace until spring.

[monaco t]

i would run the gen except the house batteries that start it are dead. guess i will pull them and charge at home. chassis battery is a bear to get to.

[brobox]

Can you get to the generator or batteries to start it with jumper cables?

The only way to stop all parasitic draws is with battery cutoff switches installed. It is hard to believe that the dash clock, CO detector, etc will draw batteries down so fast, but they do.