Originally Posted by Krazymace
Totally agree. As I previously indicated, I turned off all breakers, including the main. As soon as I turned the main back on, it tripped the GFI! So I assume nothing beyond the panel is the cause.
So where is the electrical conductor that connects the hot or neutral wire to safety ground or to earth? You have a fault. The defect need only conduct 0.005 amps. But GFCI says that fault (and potential human safety issue) exists. Often inspection is an only effective solution.
For example, is the safety ground and neutral wire connected together in the panel? Those must not connect until they meet back at the pole. Or in your case, back at the house main panel.
A screw might not have been removed to separate safety ground and neutral. A continuity (ohm) meter might be used to verify a disconnected RV means no connection between safety ground, hot, and neutral wires.
0.005 amps means a fault might be as much as 10,000 ohm.