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Per an Atwood operating manual - "The refrigerator’s electronic controls require 12 volt DC to operate". Both the divider heater and refrigerator interior light share the same black ground wire (J10-5). Power's supplied by the blue wire (J10-6).
So, it's #2, whether you're plugged into shore power or only using batteries, the result is the same...it's always on.
Rick
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