If an Onan diesel, there are 3 fuses under the plate near the generator mounted start switch.......my onan did the same due a shore power surge and the problem was the larger of the 3 fuses.
I can send photo of the removeable plate if needed
2005 Gulfstream Friendship Country Club
2015 KIA Soul pusher
1973 BSA B50
1979 Harley Davidson FLH