Trippmeister answered 8 years ago
You could have a bad alternator, that's not charging the battery. Voltage running should be 14.5 volts at the battery. You could also have a current drain, draining the battery overnight. Disconnect the battery at night to see if this is the case, assuming it's being charged by the alternator.
Why won't my battery stay charged?
1999 Mercury Grand Marquis
-
Maintenance & Repair
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
My 2000 grand marquis will turn over but won't start. I went out to my car and after running with no problems the battery was dead, I have replaced the battery. Then the car would turn over with the...
2000 Mercury Grand Marquis LS
-
Maintenance & Repair
1999 mercury grand marquis been sitting for maybe two years has high pitched whistle coming from the gas tank area it runs rough at idle but seems to be ok at highway speed any ideas? vacuum leak?
Mercury Grand Marquis
-
Maintenance & Repair
I have a 04 Mercury Grand Marquis GS with 94k on it ran like a top with zero issues a month ago it would not start so I replaced the starter and it started just fine then my shifter cable broke so ...
2004 Mercury Grand Marquis GS
-
Maintenance & Repair
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.