I'll take a guess, sometimes it's buried behind the AC breaker panel.
Regarding your volts, 13.7 is a charge voltage and you should see the same at the battery posts. 11 is pretty much a dead battery. Is it possible the battery disconnect switch is active, in other words disconnected? Easy test, unplug shore power. If the lights go out the batteries are disconnected and the converter has been powering everything.
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2006 Hurricane 31D built on a 2006 Ford F53
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