Thor Forums

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I suspect you placed the USE/STORE switch in STORE when you put it away. In that condition the house batteries will not charge from your Converter/Charger and neither will the chassis battery.

Even good house batteries will drain in a few weeks with the USE/STORE switch in STORE due to parasitic loads like the CO detector.
Chassis batteries take much longer to drain but they too will drain over several months or quicker if they are not in good shape.

How to Recover?

The USE/STORE relay gets the power to move from the house batteries so they gotta get some charge on them either by an external charger or by running the coach if you jump start it AND the BIRD/BIM is working correctly. Once the USE/STORE switch moves the latching relay (you will hear the familiar clunk) then the Converter/Charger can start charging the batteries. You should have at least 13.6 VDC on both the house batteries and the chassis battery for them to be charging.

Then the only question remaining is: will the batteries recover to be usable?