Strange Electrical Issues

the persuader wrote:
Found the issue. The neutral wire on that circuit melted insulation at rand on intervals and I guess it's grounding out against the exposed ground wire. Not sure how far down the wire it melted.

Now I need to figure out how to fish new wire through this trailer and redo that circuit.

Grounding out wouldn't do anything but trip a GCFI breaker (if you're plugged into one). Neutral and ground are at the same voltage potential. If the wire was hot enough to melt, there was a poor connection. The resistance from the connection becomes an electric heater (and drops the voltage at the destination as you experienced).

I don't know how far that wire goes or if it's attached well but you may be able to pull a new wire while pulling the old one out. If the old one doesn't move and you can't get access to where it's attached you may have to consider other options (through the floor and back up, behind cabinets, etc).

If melted spots are limited to where you have access you can consider cleaning up the poor connections and then use electrical tape over the bare spots. The wire itself is likely fine.