Voltage gauge on dash registers lower than it should on a 2000 mercury grand marquis; is this a common issue

Asked by Oct 23, 2014 at 05:25 PM about the 2000 Mercury Grand Marquis LS

Question type: Maintenance & Repair

Gauge registers below mid point....alternator is 13.5 volts running (does flucuate at times)  and battery is 12.3 at rest.

1 Answer

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Should be around 14.5 it's still charging but not where it should be probably bad voltage regulator which is inside alternator have to change alternator to change regulator they run a little over $100.00 but before you change alternator check voltage right at the battery if you have 14.5 at battery your okay there is something wrong with the dash gauge,

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