Question about 1998 Mercury Grand Marquis
The light comes on when the alternator voltage/current is low or if there is a short that is draining the battery. If it's blinking, the voltage is probably near the lower limit of acceptable voltage. Recommend checking voltage at the battery with car running. Should be at least 14 volts. If you don't have a voltmeter, take the alternator off and have it tested at the parts store. Let us know if you have more questions.
Posted on Oct 02, 2010
Testimonial: "Merchants Auto just replaced battery and checked electrical system. Though everything was fine...I'll show answer to people there. Thanks."
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Posted on Jan 02, 2017
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