Shore GFI opens when RV is plugged in to it.

papakilo42 wrote:
I have a 2004 Coachmen Leprechaun 292. Opens the shore GFI. The shore GFI operates fine with tools and other loads. Just reacts to the RV. Coach circuit breakers in off position, A/C off. When the Onan/Cummins Generator is ON Line all Coach circuits operate normally, including the A/C. I am a novice at troubleshooting RVs without wiring diagrams and specific information concerning the Energy Conditioner unit, ATS #032-00061 opt. G, Gen time-out circuit for the ATS, and what voltage/resistance/continuity measurements I should see at various connections. Where is the rectifier/diode for the ATS coil? I have been in the electronics/electrical fields for over 50 years and have never worked with RVs or not been able to obtain wiring diagrams.
Any assistance or wiring diagrams will be appreciated.
Additional Info: RV has been connected to a shore GFI for 5 years, without problems. Operation of GFI: It senses a difference of potential between Ground and Return of shore lines. The generator cannot have the Return and Ground leads connected. The generator A/C lines are normally disconnected by the ATS in Shore Power use.

It only takes 4 - 6 ma of current flow to trip a GFI (UL approval requires 5 ma)and not something a human can even feel, so any little thing at all, will trip it and long before it ever becomes a safety issue. I once had a coach that would trip the GFI when operating the rear ac directly from it. Best thing to do, other than going crazy trying to find it, is to not use a GFI for coach power and if a campground pedestal, use one of the 30 or 50amp outlets with a converter cord and whatever other adapters are necessary.