I own a motorhome that has an ONAN 4.0 genny. It has worked fine for 10 years. It has 600hrs on it. I have maintained it flawlessly. Never had an issue until last Dec.
I was on a trip with my family when all the sudden the TV quit running and the clock on the micro went super dim. After a ton of tracing, testing and replacing parts, (brushes, V-regulator, circuit board) I have narrowed it down to one symtom. There are two pair of brushes . One side puts out 220V and the other puts out 50v I have called Onan and countless RV places. No one seems to know anything. With a meter on the the brushes they both put out 220V for about 3 seconds once fireing the genny. Then one holds the voltage and the other drops. I have swapped the brushes back and fourth, old ones new ones, and it's always on the one side. So it's not the brushes themselves.
I found this forum and thought I'd take a shot. Any of you guys have any ideas? Thanks in advance for your help.