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Is this hooked up to a 12 VDC battery or not? What is the complete model number off the data plate? Get back to me with this information and I can assist you further.
I am enclosing a link to some trouble shooting guides for you that should help. I suspect that the bride rectifier is bad as that would keep the 12 VDC supplied to the set to keep it running. At least this is on BGE sets as shown. If you have a different model, please let me know. Print this out as it is some great information and the parts they sell are superior in most cases to the OEM parts from Onan and less expensive. Please get back to me later if you need more or have some other info to shed light on this. All follow ups are included in our fee. http://www.flightsystems.com/pdf/onan-rv-troubleshooing-guide.pdf
That should have been "bridge rectifier" there..............long day and my fingers are tired!