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

99,945

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

4 of 4 people found this helpful.
25,315

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.
365

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.
365

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.
50

The battery go down when it set overnight 88 grand marquis

5 of 5 people found this helpful.

Your Answer

Grand Marquis

Looking for a Used Grand Marquis in your area?

CarGurus has 1,716 nationwide Grand Marquis listings starting at $1,700.

ZIP:

Mercury Grand Marquis Experts

  • #1
    Tracy Hooks
    Reputation
    5,700
  • #2
    kbro
    Reputation
    2,120
  • #3
    Js08016
    Reputation
    1,840
View All

Related Models For Sale

Used Ford Crown Victoria
10 Great Deals out of 1,186 listings starting at $1,995
Used Lincoln Town Car
38 Great Deals out of 1,779 listings starting at $1,495
Used Chevrolet Impala
599 Great Deals out of 34,726 listings starting at $1,250
Used Dodge Charger
451 Great Deals out of 27,920 listings starting at $1,650
Used Chevrolet Tahoe
643 Great Deals out of 36,956 listings starting at $1,800
Used Chrysler 300
367 Great Deals out of 16,766 listings starting at $1,000
Used Ford F-150
2,235 Great Deals out of 183,025 listings starting at $1,500
Used Cadillac DTS
59 Great Deals out of 1,569 listings starting at $2,750
Used Ford Taurus
250 Great Deals out of 17,805 listings starting at $1,499
Used Ford Mustang
768 Great Deals out of 42,667 listings starting at $1,300
Used Honda Accord
1,046 Great Deals out of 63,027 listings starting at $999
Used Chevrolet Silverado 1500
2,134 Great Deals out of 183,037 listings starting at $1,898

Used Cars For Sale

2011 Mercury Grand Marquis For Sale
3 Great Deals out of 22 listings starting at $5,450
2010 Mercury Grand Marquis For Sale
83 listings starting at $3,990
2009 Mercury Grand Marquis For Sale
84 listings starting at $2,900
2008 Mercury Grand Marquis For Sale
8 Great Deals out of 148 listings starting at $2,250
2007 Mercury Grand Marquis For Sale
9 Great Deals out of 116 listings starting at $1,700

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.