If this is covered in another thread apologies but I didn't find it on IRV2 or other boards. Here goes.
The problem: Onan 5500 Gasoline powered generator in our 2015 Thor Challenger developed what I can best describe as frequent surge in operation. It was also fluctuating the electrical power. It continued to get worst. I looked all over the internet and could not find a good answer until I went to this website https://www.equinerv.com/node/2279
. It REALLY helped.
Bottomline I followed the directions for using Sea Foam and WOW problem fixed. Apparently the carburetor had gotten "gummed up" and the Sea Foam cleaned it out.
We are at least 140 miles from a repair facility for our generator and without this fix our winter travel plans would have been significantly altered.
Thanks to the folks over at EquineRV.com.