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Piaggio MP3, was 02 GL1800
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CastleWing wrote:
My alternator is producing 0 volts and there is continuity between the the out put and alternator body, am I correct in assuming that the thing is dead, that the windings have gone.
using a VOM, in ohms condition.

Place one lead on the alternator frame, the other lead on the output post.
If you measure continuity (in the order of a few ohms), then flip the leads over.

If the opposite leads do NOT show continuity, then the alternator is NOT shorted out.

There is a diode stack in the output of the alternator (a 3 phase generator). If all of the diode pairs are good, it will measure continuity in one direction, but not the other.

However, if ONE of the diodes in the stack is shorted, then you will see continuity in BOTH directions. The actual readings will probably be different, but that is not a good thing at best.

IF you measure a very low ohm reading from the output post to frame ground, then something shorted to ground inside the alternator frame.

I would take the alternator to a rebuilder and have it fixed. Cheaper than getting a brand new unit, and should be just as serviceable.

JMO
 
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