Hey mustang!
Do yourself a favor and do a search of the forum entries for this problem. You are certainly not the first to experience this (myself included) and the possibilities are numerous. Depending on your mechanical comfort, there are a number of tests you can do to try and narrow it down.
Good luck and please keep us posted on your progress!
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Rich '10 Providence 40X "We make a living by what we get, but we make a life by what we give". Norman MacEwan
Mustang, If I were you I would go to the other forum and search under gunny357,
he had forgot more about Gonan that most will ever know! www.RV.net
But right off the top of my head which is not too harry, I seem to member that
it can be a stuck brush or a bad regulator, low oil sw. if you have one.
And after that it can get expensive. THINK small and simple first!!!!!TENN.
The problem can be one of about four different things. Oil pressure switch, voltage regulator, control board, stator or rotor. Most common 2 are voltage regulator and control board. Then rotor, stator, and finally oil pressure switch.