Our Onan QD7500 did a self start and it turned out to be moisture in a connector on the passenger side of the generator.
I took it apart, blew it out with compressed air and resealed the connector with some dielectric grease and haven't had a problem since.
Yours might be different but it's worth taking a look.
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Denny, Connie & Shadow (former barn cat made good)
2006 Tiffin Phaeton, Cat C7, Freightliner Chassis
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