o4 grandmarquis ls battery drain

40

Asked by Apr 19, 2015 at 02:48 PM about the 2004 Mercury Grand Marquis LS Premium

Question type: Maintenance & Repair

I have an o4 grand marquis ls and my battery keeps draining, I did a parasitic draw test and found out my battery is draing very fast however I pulled every fuse and found no fuse that would stop the drawing of power from battery. I also checked the ground and everything is good.  Any suggestions would be appreciated. Thanks

9 Answers

8,715

Is there anything installed that doesn't go through the fuse box?

3 people found this helpful.
40

do you mean anything aftermarket? if so no. Everything is stock

1 people found this helpful.
79,235

How old is the battery? Have the battery load tested. HTH. -Jim

40

Battery is new and holds charge but over time loses charge due to a draw somewhere

2 people found this helpful.
79,235

If this is a car that you don't use a lot you'll want to disconnect the negative (-) battery cable when you park it. Does it have rear air shocks? If so maybe the compressor is cycling to maintain the vehicle height. My '94 Fleetwood does that. Check to see if the blower motor for the heat/air conditioning is running. Are any lights staying on? HTH. -Jim

40

no air shocks, no light on or heat

1 people found this helpful.
1,615

The alternator is one suspect, disconnect the power wire from it (the heavy one) and re-check. This is my specialty. If you hook up a 12v light bulb between the batt. pos and the car does it light up? If not, use a seat belt buzzer or such. It will buzz and drive you crazy, but then disconnect wiring harnesses and devices until it stops. I bet it's the alternator, I ran a cross a ford doing this. Disconnect all wires to it when testing. Bad diodes, or regulator inside.

3 people found this helpful.
40

thanks will try and get back

40

I used a volt meter on battery ground and put the positive side on the wire harness part of alternator. I was reading 3.76 volts when car was in the off position. So, it must be the alternator trippmeister because their should be no draw from alternator when car is off. Thanks .

Your Answer:

Grand Marquis

Looking for a Used Grand Marquis in your area?

CarGurus has 1,226 nationwide Grand Marquis listings starting at $1,799.

ZIP:

Mercury Grand Marquis Experts

  • #1
    Tracy Hooks
    Reputation
    6,060
  • #2
    kbro
    Reputation
    2,240
  • #3
    Js08016
    Reputation
    2,060
View All

Related Models For Sale

Used Lincoln Town Car
27 Great Deals out of 1,480 listings starting at $1,900
Used Ford Crown Victoria
749 listings starting at $1,900
Used Chevrolet Impala
431 Great Deals out of 25,967 listings starting at $950
Used Ford F-150
2,415 Great Deals out of 207,421 listings starting at $1,300
Used Mercury Marauder
31 listings
Used Chevrolet Tahoe
571 Great Deals out of 38,557 listings starting at $1,243
Used Ford Mustang
256 Great Deals out of 38,498 listings starting at $1,350
Used Chrysler 300
304 Great Deals out of 19,226 listings starting at $1,900
Used Toyota Camry
752 Great Deals out of 73,889 listings starting at $1,250
Used Cadillac DeVille
1,279 listings starting at $1,895
Used Honda Accord
582 Great Deals out of 104,446 listings starting at $1,225
Used Ford Taurus
181 Great Deals out of 16,027 listings starting at $1,173

Used Cars For Sale

2007 Mercury Grand Marquis LS Premium For Sale
5 Great Deals out of 64 listings starting at $2,995

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.