i have a 2001 grand marquis what does low voltage mean i just got a tune up do i need a new battery they said it was fine idk what do i do

Asked by Laron Jun 26, 2015 at 06:51 PM about the 2001 Mercury Grand Marquis LS

Question type: Maintenance & Repair

3 Answers
102,645

Reelin68 answered 8 years ago

If battery tested fine, then you most likely have a bad alternator. If you have a volt meter, put it on the hot side of the alternator and see what it's putting out for volts. Should be 14 volts. If you don't have a volt meter, drive to Auto Zone and they will test it for you.

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157,505

Bob answered 8 years ago

With the engine running measure voltage across the battery. It should be 13.8 to 14.6 volts. If it is lower there may be a problem with, the alternator, the alternator to battery wire or the voltage regulator. Also make certain the battery cables are free from corrosion and clean and tight.

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