GFCI Issue looking for a solution

[TBammer]

My camper has a 15 amp GFCI circuit that starts in the bathroom and has 4 other outlets downstream on the load side. While out camping recently I had issues with the GFCI refusing to reset when the camper was plugged into the post and we were on shore power. I would hit the reset button and it would just trip again. I bought a new GFCI outlet and same problem. I thought it was a problem with one of the downstream outlets.

I figure when I'm home I'll start isolating the outlets one by one to find the culprit. At home, and with the help of an adapter on the cord, I plug into an isolated 15 amp circuit (don't have a 30 amp circuit) off my house panel. And this point I think, just for the heck of it, try to reset the outlet, and lo and behold it resets. I am not doing anymore investigation into other outlets for now.

The only thing I can think is that the voltage at the campground was low. Would that cause a GFCI not to reset? Is one of those Progressive EMS surge protectors the answer? How hard a wiring job is the onboard style?

[KD4UPL]

I would suspect you got some moisture somewhere, probably in an exterior outlet. That was causing the GFCI to trip. Now that it has dried out from heat, wind, whatever the problem is gone. Does your exterior outlet have a proper cover? Is the cover caulked well where it meets the side of the RV?

[agesilaus]

Could be a bad GFCI, I just had to replace ours. It would not reset.

[time2roll]

Also possible the campground power had some issue. Too late to go back and test. I would do no repair at this point. Consider an EMS surge protector for future adventures.

[enblethen]

Voltage would have to be extremely low, down around 90 volts by memory.
Testing would start at the GFCI, disconnect load wires, see if it resets. Yes, means down stream issue. No something wrong in feed to GFCI, loose connection in 120 volt AC distribution panel or shore power connection.
I am guessing loose connection!