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

360

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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