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3k Chinese alternator just stopped mid run

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tyssniffen:
So, Merry Christmas to me. Alternator just quit during a run? I examine the wiring and it looked like one of the wires connecting the voltage regulator had melted? Disintegrated? Certainly was disconnected, so I reconnected it. Still nothing coming out. Voltage at the posts is only 12.6? Is this a bigger wiring problem, as in a winding problem? How did this suddenly stop working? nothing else seems wrong.

ajaffa1:
Merry Christmas from down under. Sorry to hear your alternator just died. Is this an ST type generator head? Was it under load when it died?
ST heads only have two sets of windings, one on the armature connected to the slip rings, the other is connected to four electromagnets around the inside of the housing. Test both with a multimeter, there should be a small resistance in each winding (10 ohms ish). If either is open circuit it`s probably fried. If both circuits are ok you may need to flash the winding to regenerate a magnetic field.

Good luck

Bob

tyssniffen:
Yes this is an st. And yes it was under load when it stopped putting out power . Another update, I had another possibly old voltage regulator and I put that in position, and it started making 110 again, for a little while.

tyssniffen:

--- Quote from: ajaffa1 on December 25, 2022, 08:50:27 PM ---ST heads only have two sets of windings, one on the armature connected to the slip rings, the other is connected to four electromagnets around the inside of the housing. Test both with a multimeter, there should be a small resistance in each winding (10 ohms ish). If either is open circuit it`s probably fried. If both circuits are ok you may need to flash the winding to regenerate a magnetic field.

--- End quote ---

Are you saying I have to get in there with the case off and everything? Or is there a way to touch the windings without taking the entire outer shell off?

ajaffa1:
You should be able to find the wires in the top box. two will go to the slip rings and two to the electromagnets. There maybe a third set of windings that produce about 9 volts to drive the small neon light on the front of the top box, you can ignore those.

Bob

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