Question about 1999 Ford Taurus

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Replaced alternator on a 2002 ford taurus, still showing low voltage engine light still coming on

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Check the battery as well. it might have been drained as it labored without the alt. Engine light usually means a bad sensor, auto zone will check car for free to find specific sensor.

Posted on Jul 01, 2009

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You have to test the alternator output, should be about 14 - 16 volts.

Test your battery too, fully charged battery should be about 13 volts.

If these check out ok, the problem is the sensor or the wiring in the sensor circuit

Posted on Jul 01, 2009

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