Posted by Bob M on February 24, 2009 at 17:01:18 from (74.74.133.120):
In Reply to: 340 U Alt. posted by Al W on February 24, 2009 at 16:38:48:
A good alternator will show continuity with the ohmmeter probes connected one way, but no continuity when the probes are reversed.
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If your meter has a DC current setting do this: Set the meter to read DC current, disconnect the wire from the alternator BAT post, then connect one meter probe to the wire end and touch the other probe to the BAT post. A good alternator will draw no current or just a few milliamps of leakage current.
Or simply disconnect the wire at the BAT post when you shut down (tape the wire terminal for safety!). If the battery now stays up the problem is the alternator.
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