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

108,895

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

4 people found this helpful.
28,285

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.

4 people found this helpful.
445

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

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

2 people found this helpful.
445

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 people found this helpful.
50

The battery go down when it set overnight 88 grand marquis

5 people found this helpful.

Your Answer:

Grand Marquis

Looking for a Used Grand Marquis in your area?

CarGurus has 1,270 nationwide Grand Marquis listings starting at $1,196.

ZIP:

Mercury Grand Marquis Experts

  • #1
    Tracy Hooks
    Reputation
    6,070
  • #2
    kbro
    Reputation
    2,240
  • #3
    Js08016
    Reputation
    2,160
View All

Related Models For Sale

Used Lincoln Town Car
29 Great Deals out of 1,440 listings starting at $899
Used Ford Crown Victoria
4 Great Deals out of 744 listings starting at $1,800
Used Chevrolet Impala
503 Great Deals out of 25,998 listings starting at $995
Used Cadillac DTS
25 Great Deals out of 1,299 listings starting at $2,499
Used Ford F-150
2,281 Great Deals out of 188,281 listings starting at $1,300
Used Ford Mustang
317 Great Deals out of 38,105 listings starting at $1,312
Used Ford Taurus
193 Great Deals out of 15,464 listings starting at $600
Used Chrysler 300
411 Great Deals out of 19,380 listings starting at $1,700
Used Dodge Charger
317 Great Deals out of 31,958 listings starting at $1,500
Used Chevrolet Silverado 1500
1,726 Great Deals out of 154,936 listings starting at $1,700
Used Toyota Camry
851 Great Deals out of 70,814 listings starting at $1,300
Used Chevrolet Tahoe
629 Great Deals out of 38,014 listings starting at $1,199
Used Buick LaCrosse
209 Great Deals out of 11,451 listings starting at $1,175

Used Cars For Sale

2011 Mercury Grand Marquis For Sale
3 Great Deals out of 24 listings starting at $5,888
2010 Mercury Grand Marquis For Sale
3 Great Deals out of 76 listings starting at $3,995
2009 Mercury Grand Marquis For Sale
3 Great Deals out of 62 listings starting at $1,400
2008 Mercury Grand Marquis For Sale
4 Great Deals out of 98 listings starting at $2,495
2007 Mercury Grand Marquis For Sale
4 Great Deals out of 85 listings starting at $1,196

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.