Cleaned all connections, battery all the way to onan, positive and negative cables, even the bolts and screws, lol, still no good, I guess the starter may be the cause, not sure. But I believe I have done all I know to do since I'm no generator man. thanks for the help Clyon51, we tried, that's all I can ask.
Tom and Nancy
1998 Four Winds class C, 31ft, V-10
2008 ford Taurus in tow