We look to see if the clock display on the microwave is lit up, then we know we have shore power.
From my understanding you should "always" be on the 12 volt battery for the 12V load. The converter isn't capable of providing enough current for heavy loads, so it "supplements" (keeps the battery topped off); this is why there is a notice you should only maneuver the slideouts with a battery installed.
By the way, if you don't have some sort of EMS installed, I (and others on this forum) highly recommend you do so. If you get the one with the remote readout this is another way of seeing you have shore power.
EDIT: Canonman types faster than I do!
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Now: 2019 Winnebago 2500FL w/e2 WDH;Sold: 2015 Bullet Premier 19FBPR (shown)
2012 Ford F-250 Lariat Super Duty Crew Cab (gas 6.2 L, 3.73 gear ratio 2WD, 172" WB)
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