Sounds like your batteries are dead and the USE/STORE switch is still in STORE.
Placing it in STORE does not stop all drainage from the batteries, plenty of threads on here about that. If your batteries were already down to 9 volts and you "stored" your coach for a couple of months then I would expect them to read 0 VDC, even if they were good, if you didn't have SP connected.
So connect your coach to SP, get a voltmeter (to eliminate the possibility of an Inverter issue), Put the USE/STORE switch in USE and measure the battery voltage at the batteries.
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Ted & Melinda
2016 ACE 27.1
2016 Chevy Sonic Toad - Selling
2020 Chevy Colorado Z71 Trail Runner Toad
2024 Chevrolet Trax 2RS - Soon 2B TOAD
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