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I am adding a link to a free Service Manual for this model. Print this out as it will give you all you need to know and how to check for this fault. Then get back to me if you need more input or have further questions. All follow ups are included in our fee. http://www.generator-parts.com/manuals/generac-rv/0E1881.pdf
See the various diagnostic tests and the one about producing no power is on page 26. Do those and you should be able to sort this out.
Just checking back in to see if perhaps you missed my earlier responses to your question? Please get back to me if you need more input from me in order to resolve this issue. All of the follow ups and exchanges are included in our fee and a phone option is available if you think that would be more helpful here.