BATTERY LIGHT

Asked by John Sep 27, 2019 at 07:11 PM about the 2009 Mercury Grand Marquis LS

Question type: Maintenance & Repair

I have a 2009 Mercury Grand Marquis..battery light stays on..charges just
fine...I put several new alternators on it and the  same thing.....I've been driving
it for 9 mos this way charges just fine,starts strong. the light just stays on.
Thanks

1 Answer
159,045

Bob answered 5 years ago

Put a DC volt meter on it to see what the charging voltage is. The PCM controls the alternator and it may be overcharging. If it is overcharging the battery will eventually be ruined.

Mark helpful

Your Answer:

Related Questions

  • Battery light 2 Answers

    Have a 2007 Mercury Grand Marquis battery light will randomly come on and go offperiod recently replaced the alternator should I replace the battery? Also check engine light came on code came bac...

    2007 Mercury Grand Marquis LS Premium

    -

    Maintenance & Repair

  • BATTERY LIGHT 1 Answer

    I have a 2009 Mercury Grand Marquis..battery light stays on..charges just fine...I put several new alternators on it and the same thing.....I've been driving it for 9 mos this way charges just fine...

    2009 Mercury Grand Marquis LS

    -

    Maintenance & Repair

  • Battery light 2 Answers

    I have a 03 grand marquis when I start my car and let it run for a while the battery light comes on and when I drive it's still on and my car will just shuts itself off while I'm driving and I do...

    2003 Mercury Grand Marquis GS

    -

    Maintenance & Repair

  • battery light 99 grand marquis 2 Answers

    battery light started coming on intermittently have 12 volts when off and 14 when running

    1999 Mercury Grand Marquis 4 Dr LS Sedan

    -

    Maintenance & Repair

  • 2007 Mercury Grand Marquis Battery Light 1 Answer

    All of a sudden, my battery light is coming on/going off while driving. I did have a wreck (that effected the body only) last month. Any suggestions? This just started today.

    2007 Mercury Grand Marquis LS Premium

    -

    Maintenance & Repair

Shortcuts

Search Mercury Grand Marquis Questions

CarGurus Experts

  • #1
    Tracy Hooks
    Reputation
    9,850
  • #2
    Trippmeister
    Reputation
    5,140
  • #3
    Bob Beaman
    Reputation
    3,880
View All

Find great deals from top-rated dealers

Search

Related Models For Sale

Used Lincoln Town Car
8 listings
Used Ford Crown Victoria
5 listings starting at $8,000
Used Chevrolet Impala
14 Great Deals out of 117 listings starting at $3,531
Used Ford F-150
327 Great Deals out of 15,257 listings starting at $3,295
Used Lexus LS
3 Great Deals out of 28 listings starting at $7,900
Used Ford Mustang
46 Great Deals out of 1,263 listings starting at $4,995
Used Honda Accord
44 Great Deals out of 919 listings starting at $2,799
Used Chevrolet Tahoe
15 Great Deals out of 853 listings starting at $5,995
Used Cadillac DTS
12 listings starting at $7,999
Used Chrysler 300
43 Great Deals out of 505 listings starting at $4,999
Used Dodge Charger
36 Great Deals out of 630 listings starting at $4,888
Used Chevrolet Camaro
22 Great Deals out of 321 listings starting at $10,500

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use. Content will be removed if CarGurus becomes aware that it violates our policies.