Originally Posted by Krazymace
So what's my cure? Appreciate all your info. Good stuff!
Inspection: no conductive material (copper wire, plug prongs) should be able to get wet.
Measurement: with power code disconnected from that GFCI outlet, measure between each conductor with an ohm meter. Anything connection between any two conductors that is near to or less than 20,000 ohms is a fault. A meter can help narrow down the search for that fault.
Testing: when everything is dry and the GFCI does not trip, then use a garden hose to slow wet different locations until the GFCI trips. You need not worry much about being electrocuted becaues the GFCI should trip before you can be shocked. As soon as a wet spot trips the GFCI, then you have a suspect location.
And finally, if the cable has a hole or crack, then moisture may have gotten inside. Getting inside of a cable dry before sealing it can be challenging. One popular solution was to put the break into a sealed container with rice. Over a week, rice may draw out that moisture.
One correction. Neutral and safety ground wire should not be connected anywhere until both meet at the pole. Or in this case, at the main breaker box in the house. If neutral and ground are shorted together in the coach breaker box, then that would explain a house GFCI trip and no coach GFCI trips.