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The RPM change affecting the light seems to indicate that it's the alternator. Perhaps it has a bad voltage regulator? Maybe it's not the right alternator for your car?

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โˆ™ 2007-04-03 21:45:27
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Q: What causes the battery light to turn on above 2000 rpm and off below 2000 rpm when a new alternator and battery were installed on a Mercury Tracer two weeks prior?
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