Quote Originally Posted by ForBruce View Post
it look like you lost the white neutral return wire going back to the house and the ground substituted which do not carry a heavy amperage electrical contact..
Losing the neutral wire going back to the house somewhere still wouldn't put current through the ground contact at the RV input plug. Assuming all the other wiring is OK, this would simply open the circuit - no power at the RV.

There are only two ways I can think of that current would flow through the ground connection of the trailer input plug. The first would be a "hot" ground wire at the supply plug-in point for the RV cord. (See Post #14 ). This is unlikely and should be easy to determine and eliminate which it looks like the OP did in post #17 .

That leaves the second way which is a neutral/ground bond somewhere on the RV side of the RV input plug.