Start at the house battery and follow the power.
First thing after the positive connection is a circuit breaker. May be hidden but should be within a foot or so of the battery. Of course, check that the ground cable is functional.
Next is the battery disconnect. Its a solenoid that is controlled by a switch, often near the door. If ON, it should have power on both big terminals.
From there the wiring goes to the fuse panel, converter/charger area.
TEST with the shore cord unplugged.
Don't know what the thing above dash is. Are you talking about an inverter ?
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