I can understand the confusion. An RV doesn't work like ones home. If the lights go off at my house the problem is usually a bulb or a circuit breaker, rarely a switch, Or the whole thing goes down with the neighborhood Or just me if I don't pay my bill.
Your RV has three electrical systems, uses both 120VAC and 12VCD, and several sources of power. It is also subject to earthquakes when traveling or in use that loosens stuff up, and there are problems with corrosion as well. The source of power, the pedestal, can be problematical, you can have a hot skin, etc.
Never a dull moment. Consider taking a service technician on vacay with you.