Forum Discussion
psa0298
May 29, 2014Explorer
I just had my 1990 onan marquis 6500 in to the cummins/onan shop last week for the very same problem. They advised it was the rotor slip rings. Over time the rings get a residue on them and they need to be cleaned and polished. It can keep the brushes from making proper contact and therefore will not produce AC power. The generator is designed so that it will not run unless it produces AC power. It could be the voltage regulator as well...they tested it first.
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