The transfer switch is on the AC side of life - selecting between the Genny and shore power. Doesn't have a role at all when unplugged and not running Genny.
On most of our rigs, the use/store does nothing when 110v is present... as the converter is supplying 12v regardless of anything else.
Also why the 'batteries' will read over 12v when plugged in... Really seeing the converter output.
I would start with rig unplugged at batteries. check the voltage.
Check the 100a breaker right near battery... See if flag is popped out...
Next would be the use/store switch and it's solenoid.
__________________
Greg
Not yet retired...
Florida (Michigan transplant)
2014 Hurricane 32A
2000 Infinity (previous)
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