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Could it be that there is a transfer switch which feeds power from either shore power or inverter. The wire you unplugged from the inverter goes to the transfer switch? If so, then removing the power from to the inverter to the switch has no effect if shore power is present. Are you hooked to shore power?
You wrote " I also turned off every A/C breaker in the power distribution box, including the two 30 amp breakers..". Can I assume that is a typo as there normally aren't 30 amp breakers in a Montana?
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Carl (n Susan)
There is more to life than fuel mileage.
2012 Montana 3700RL Big Sky Package towed by a 2015 Ford F350 6.7L PSD 4WD CC LWB
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