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Old 02-16-2016, 11:54 AM   #11
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Have you tried a standard outlet w/o ground fault? (Shore power).
Since the wet spaces are protected, a supply GFCI is not required or recommended.

Hi Vince, I can't do that because where we store the coach, all of the receptacles are gfci protected. They said that's a requirement for city code.
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Old 02-16-2016, 11:57 AM   #12
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I was talking about the shore power. It still remains that if all the breakers are off and all is fine, then flip the main on (with all breakers off), and the GFCI trips, there is something between the 50amp main and the other breakers that is tripping the GFCI. Assuming all the other breakers are good (I would test each), the panel is the only thing downstream of the main. Nothing should be tied to the main breaker except the panel itself. In a working coach, if the 50amp main was tripped or turned off, nothing in the coach would work. Does everything work with generator running? If so, have you checked for a "hot skin" condition?

When running the generator, there are no issues. But then again, 50amp 220v current is not where we are having problems. Only when we are plugged into 115v to keep the coach batteries charged. What is a hot skin condition?
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Old 02-16-2016, 12:06 PM   #13
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It doesn't take much at all when plugging an RV into a GFCI shore power outlet for it to trip.

Have you tried using a different adapter on your shore power cord?

EDIT: Nevermind I see you have.

I have read where the ground on the shore power cord or the inlet to the RV for it can be burned too, causing other problems.
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Old 02-16-2016, 02:00 PM   #14
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A possibility would be that the service dealer crew swapped a hot and neutral wire during their time with it. A GFCI would detect that and trip. Without a GFCI everything would still work. Could be difficult to find.
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Old 02-16-2016, 02:09 PM   #15
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A possibility would be that the service dealer crew swapped a hot and neutral wire during their time with it. A GFCI would detect that and trip. Without a GFCI everything would still work. Could be difficult to find.
That'd be my guess too...
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Old 02-16-2016, 02:24 PM   #16
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I had exact same issue. Turned out I had left the WH on while tank was empty. Burned up element which created a short. Disconnected element and everything was fine. Then replaced element and always remember to turn off HW heater if I plan on draining.


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Old 02-16-2016, 02:32 PM   #17
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Sadly GFCI'S don't last forever outside moisture, multiple tripping will wear them out. I bought a brand new one and it tripped replaced with another one it works. Might also check the polarity if wired wrong it would trip.
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Old 02-16-2016, 02:37 PM   #18
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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.
The way a GFCI works is to monitor any current flowing on the ground circuit, with the intent that if you are part of that circuit, it would save you from electrocution by tripping. I have tested a couple by accident over the years and they trip about as fast as you realize you are being shocked.

With that being said, you need to look for anything that is a possible conductive path from the hot lead to ground that would be allowing the current to flow. Moisture is a big cause of tracking at an outlet, but you could have some carbon on the panel board from the earlier high voltage burn.

I would also look closely at any possible locations the neutral could be touching anything metallic (like the TT siding or metal plumbing) or be physically connected to the ground wire down line of the GFCI. If y6ou have access to an AC ammeter, try measuring the current in the ground wire as you switch things on ... should take you right to the short or at least narrow it down for you.

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Old 02-16-2016, 02:40 PM   #19
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I had a similar issue on my Silverback whenever I would plug in at home to house 15 amp gfi it would trip,If I pluged into a non gfi it would not trip.The cause was loose white wires connecting to the Converter bus bar I tightened all wires holding screws and the problem went away
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Old 02-16-2016, 02:54 PM   #20
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X2 on element in WH. If it burns out it will cause the GFI to trip. Even if the WH is turned off now.
Disconnect both wires from the heating element, insulate them then try again. If GFI does not trip element is burned out.
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