I had an alternator reading "12" (which was the discharged battery voltage,
in retrospect), but the problem was the regulator. My mechanic said he
diagnosed it by "just knowing."

(The following year, the alternator went - and I've learned a few things
about charging circuit management in the interim!)

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Charles T. Low
- remove "UN"
www.boatdocking.com/BDPhoto.html - Photo Contest
www.boatdocking.com
www.ctlow.ca/Trojan26 - my boat

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"Gould 0738" wrote in message
...
How do I determine if its the alt. or the regulator.

With a progressive test light or (better yet) a meter.

With the engine running, measure the voltage at the connections on the
back of
the alternator. Should be well over 14 volts.
If it isn't, (and especially if its the same reading you're getting off
your
battery terminals when the engine is not running or there is no charger
connected),
look at the alternator.