This is an indication of a failed connection. Somewhere. Since you probably do not know how the affected circuit was run, it's going to take some time - but it's not difficult work. But before we roll up our sleeves - first locate and RESET any Ground Fault Interrupter (GFI) type outlet. If any fail to reset - replace it with another GFI outlet with the same electrical rating. Pay attention to which cables and wires that are connected LINE and LOAD terminals wires when removing and replacing! Don't forget to check outlets on the outside of the 5th wheel.
Circuits fail almost always at connections. Wires and cables in walls don't just "break" in the middle. We need to check connections in the bad circuit. First, plug lights in all the outlets. Turn the circuit breaker for the bad circuit from ON to OFF. Note which lights shut off. With the break OFF, check the outlets that WORKED.
We're looking for the point that power entered the outlet box, but due to a failed connection is unable to leave it and feed the first failed outlet. Check and tighten all screw terminals and wirenuts. Check both hot and neutral wires. Make sure no wires are loose, pull out or are burned (cut and strip back these wires and reconnect / wirenut). Try to power the circuit to see if you found the problem after each check - if not - repeat at the next outlet that worked until you find the problem. If you are still unable to get it working after checking the working outlets, repeat the process on each of the non-working outlets. If still unable to get it working, check ceiling fixtures as it is not uncommon to wire to the light fixture first and then feed down to outlets.
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