Hey everyone, have one that has stumped me (licensed small appliance electrician) and the service department for Forest River coaches. Any thoughts would be appreciated.
When we plug into shore power 115V GFCI to keep the batteries charged in storage, the GFCI trips as soon as we plug in the coach. We have been storing it here for 8 months and never had an issue until after we received it back from MHSRV (Service Dealer). We had an issue where the Gen was frying the circuit board on the auto transfer switch. We went through 4 auto transfer switches before we finally found out that Onan had an issue where the gen was sending too many volts to the auto transfer switch. So, they replaced a board on the generator to fix the issue. Now that we have the coach back this issue has started. Please see a list below of everything we and the dealer have already tried before you list your idea.
1. Turned off all breakers on the main breaker panel and shore GFCI does not trip.
2. Turn on Main 50 amp breaker and the shore GFCI trips
3. Disconnect the Line coming on from the generator to the auto transfer switch and the shore GFCI still trips
4. Tried a new power cord and the shore GFCI still trips
5. Tried a new Auto transfer switch and the shore GFCI still trips
6. Tried a new 50 amp breaker and the shore GFCI still trips
7. Tried a new 50 amp to 30 amp reducer and a new 30 amp to 115V reducer and shore GFCI still trips
8. Nothing is plugged into the outlets in the coach (which I assume are tied to the main 50 amp breaker since there is not a breaker labeled Receptacles)
So, basically the only thing connected to the shore pole 115 GFCI plug is the Main cord to the coach, the auto transfer switch and the main breaker
So, what are we missing? Thank you for your help, we are so frustrated at this point.