Why is my battery going dead overnight in my 201l Mercury Gran Marquis (new battery) with nothing on and my ignition key out?

Asked by Jun 22, 2013 at 05:43 PM about the 2010 Mercury Grand Marquis

Question type: Maintenance & Repair

I have noticed my electric radiator fan is coming on and going off even after the ignition key is out.

6 Answers

97,115

Remove the radiator fan fuse and see if the battery holds a charge.

4 of 4 people found this helpful.
24,225

Somewhere around 2006, Ford decided to eliminate a diode in the AC clutch circuit causing the AC Relay to overheat and stick closed. In other words, the AC System is powered even with the car off. To check: I like to mark the AC clutch with white or yellow paint - just an easy-to-see spot, turn off the AC, start the engine, and see if the compressor's engaged. If it is, It's the AC relay stuck closed. Another indicator of this may be a rather large puddle of clear water forming under the passenger's side of the car when parked for 10 to 20 minutes after driving for a while. The AC relay is in the fuse box under the hood and fairly inexpensive. I'm considering studying an old system to see where and what type of diode to use and retrofit our Patrol Cars. We've had lots of dead batteries and a couple of ruined evaporator cores because of this one.

3 of 3 people found this helpful.
345

You might also have someone check the voltage regulator. If it fails it can drain your battery.

1 of 1 people found this helpful.

Eric the car guy will take you through what it's gonna take to find your parasitic drain..probably the make-up light on the passenger's visor, the courtesy light in the trunk underhood or in the glovebox~....good luck~ http://www.youtube.com/watch?v=KF1gijj03_0

1 of 1 people found this helpful.
345

I had a '97 Jeep Grand Cherokee that kept losing battery charge. Finally found out that the switch on the dome light over the rear liftgate had been left in the "on" position. Since I usually came home at night and the lights remained on for a few seconds after the doors were shut and locked, it went undetected for a long time.

1 of 1 people found this helpful.
30

The battery go down when it set overnight 88 grand marquis

3 of 3 people found this helpful.

Your Answer

Add photo

Related Questions

  • New battery goes dead over night 20 answers

    2010 mercury grand marquis. New battery goes dead over night. Trunk light is off, glove compartment light is off, vanity lights in visors are off. AC compressor is not engaged when vehicle is not runn...

    2010 Mercury Grand Marquis LS

    -

    Maintenance & Repair

  • Why does by 1999 Grand marquis not start sometimes? 12 answers

    It has happened to me twice now, after driving in town going shopping at at a few places. Each time I had it towed to the dealer and they couldnot find anything wrong with it. It would start every t...

    1999 Mercury Grand Marquis 4 Dr LS Sedan

    -

    Maintenance & Repair

  • Battery draining overnight 1 answer

    Hi All, My my new 2 day old battery drains overnight. I noticed that I can turn on the fan in the car with the keys out of the ignition. This just started happening Any ideas

    2000 Mercury Grand Marquis GS

    -

    Maintenance & Repair

  • 85 gran marquis won't turn over why 4 answers

    1985 Mercury Grand Marquis

    -

    Maintenance & Repair

Grand Marquis

Looking for a Used Grand Marquis in your area?

CarGurus has 1,804 nationwide Grand Marquis listings starting at $2,250.

ZIP:

Search Mercury Grand Marquis Questions

Mercury Grand Marquis Experts

#1 Tracy Hooks
Tracy Hooks
Reputation 5,460
#2 kbro
kbro
Reputation 2,060
#3 Js08016
Js08016
Reputation 1,740
View All

Related Models For Sale

Used Ford Crown Victoria
12 Great Deals out of 1,069 listings starting at $2,995
Used Lincoln Town Car
33 Great Deals out of 1,820 listings starting at $1,750
Used Chevrolet Impala
521 Great Deals out of 31,726 listings starting at $1,450
Used Ford Mustang
472 Great Deals out of 45,735 listings starting at $1,999
Used Dodge Charger
407 Great Deals out of 28,172 listings starting at $1,988
Used Ford Taurus
246 Great Deals out of 20,434 listings starting at $699
Used Ford F-150
2,195 Great Deals out of 206,316 listings starting at $1,499
Used Chevrolet Tahoe
549 Great Deals out of 29,234 listings starting at $1,699
Used Cadillac DTS
58 Great Deals out of 1,630 listings starting at $1,995
Used Chrysler 300
413 Great Deals out of 19,932 listings starting at $1,000
Used Buick LaCrosse
226 Great Deals out of 21,522 listings starting at $1,100
Used Chevrolet Silverado 1500
1,716 Great Deals out of 175,751 listings starting at $1,250
Used Chevrolet Camaro
226 Great Deals out of 30,943 listings starting at $1,217

Used Cars For Sale

2011 Mercury Grand Marquis For Sale
35 listings starting at $4,995
2010 Mercury Grand Marquis For Sale
5 Great Deals out of 90 listings starting at $2,799
2009 Mercury Grand Marquis For Sale
8 Great Deals out of 94 listings starting at $3,790
2008 Mercury Grand Marquis For Sale
11 Great Deals out of 144 listings starting at $2,250
2007 Mercury Grand Marquis For Sale
3 Great Deals out of 140 listings starting at $2,495

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.