i put thousands of hours, on generators
Onan is normally very long lived
lack of use aka low hours, kill more Onans than two much use
moisture collects, things corrode and rust, field brushes stick, voltage regulators get voltage spiked from the sticky brushes and corroded connections
what that guy told you "IS WRONG"
I can explain it to you.
But I Can Not understand it for you !
....
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1997 F53 Bounder 36s