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if it's measured at the battery, that is no test of the alternator, and you could just have a dead cell in the battery, or be low on water (only use deionized or distilled water - never tap)
you need to measure it at the alternator to tell if it's outputting correct voltage. even then, it may still be bad if it isn't putting out the right amperage as well. i've seen alternators with bad bearings put out full voltage, but only 5 amps.
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