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Reply to "Alternator light intermittent"

Did you check the voltage at both the alternator and the battery?

Two things: 

Firstly, if the voltage at the alternator output terminal is less than 13.8, engine running(and try revving it to see if voltage goes up, light should go out), your voltage regulator is either set too low, or on the way out. Replace it.

13.8 to 14.2 is perfect charging voltage, depending on battery condition, load, and rpms of course.

Check the voltage between ground(alternator case) and positive alternator terminal. Use a digital multimeter. Then check the voltage across the battery terminals, engine running. If the battery measures more than 0.1 volt less, more investigation is needed to see where you're losing the voltage. It could be a bad ground, bad crimp, corroded cable or end internally, bad positive or ground cable etc.....

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