You haven't mentioned your store/use switch (usually right by the entry door, but I don't know where the switch is on your trailer.) When you rock the switch you should be able to hear a distinct click of a relay. Do you hear anything when you cycle this switch? It's an electromechanical relay, so it may simply have failed in the "open" state. If that's open, nearly everything inside your trailer will NOT be energized by the batteries, but WILL get power when you're on shore power.
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— David
Zero Gravitas — 2017 Flying Cloud 26U | WBCCI# 15566
He has all of the virtues I dislike and none of the vices I admire. — Sir Winston Churchill
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