The 'nothing works' call, which is almost always the converter, the batteries or the shore power connection rather than everything at once.
When every 12-volt system in a rig quits at once, the cause is usually one shared component rather than a dozen unrelated failures — the converter, the battery bank, or the shore power connection feeding them. Tracing it back to that shared point, working from the power source inward, is most of the diagnosis.
Batteries in particular can read a reasonable voltage at rest and still fail under load, which is why a quick check often misses the actual problem. This is diagnostic work for a qualified technician rather than something to troubleshoot yourself, especially once wiring and connections are involved.
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