I have an EMS and always plug into shore power with all the breakers on (engaged).
However, the DC (and BCM, for that matter) are powered through the 12V system, not the 120V system. You mentioned that "you turned the battery switch back on" - was it on during your initial attempt?
I don't have answers to the other questions you asked about using the BCM when the DC is out, but I would be interested in this as well.
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2022 Cedar Creek Champagne 38EL - "Big Bertha"
2019 GMC Sierra 3500 Denali HD 6.6L Duramax TD, CC, 4WD, DRW - "Mr. Beefy"
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