i replaced the alternator on it cause when i took the positive off it would shut off, it still does it with the new one, so i tested the old one and it was good so what could be the problem


Asked by Mar 01, 2014 at 04:29 PM about the Mercury Grand Marquis

Question type: Maintenance & Repair

2 Answers


And why are we unhooking it? Do not advise to unhook positive cable to test if an alternator is bad. Could potentially short out some of your electronics. Old school cars this was not a problem but with newer ones you could end up in a mess. Is battery not staying charged? Is gauges jumping around? If so test battery and check battery connections. Also check the negative battery connections on the frame and motor. All connections must be clean and tight for the alternator, battery and all electronics to work properly.

1 out of 1 people think this is helpful.

I did replace battery with new one cause it was bad and it still messing up so I'll check all my connections to the ground on chassis and starter, thanks again and I won't disconnect the positive again, you were a great help.

Your Answer

Add photo

Related Questions

  • 2001 Marquis having alternator problems 2 answers

    My 2001 Grand Marquis recently stopped and would not start again. After some diagnostics I determined that the alternator wasn't charging properly and replaced it. A week later the new alternator wa...

    2001 Mercury Grand Marquis LS


    Maintenance & Repair

  • New alternator, but battery gauge still low 5 answers

    I got a used 1999 Mercury Grand Marquis a few weeks ago. Theres about 106,000 miles on it so far and I noticed the battery gauge needle was starting to drop and not stay in the middle like it's suppo...

    1999 Mercury Grand Marquis 4 Dr LS Sedan


    Maintenance & Repair

  • 2001 mercury grand Marquis the alternator light comes on and off.just put in brand new one still doing the same thing 4 answers

    2001 Mercury Grand Marquis LS


    Maintenance & Repair

  • New battery goes dead over night 19 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

  • Alternator "groan" 16 answers

    I have a 1999 Mercury Mountaineer. V-8 AWD. It starts, and runs fine. However, it has developed a "groaning" sound, that I have tracked to the alternator, using an automotive "stethoscope". I replace...

    1999 Mercury Mountaineer 4 Dr STD AWD SUV


    Maintenance & Repair

Search Mercury Grand Marquis Questions

Mercury Grand Marquis Experts

#1 Tracy Hooks
Tracy Hooks
Reputation 4,820
#2 kbro
Reputation 1,910
#3 Js08016
Reputation 1,420
View All

Related Models For Sale

Used Ford Crown Victoria"
10 Great Deals out of 1,635 listings starting at $1,950
Used Lincoln Town Car"
48 Great Deals out of 2,404 listings starting at $1,542
Used Chevrolet Impala"
947 Great Deals out of 35,735 listings starting at $700
Used Mercury Marauder"
52 listings starting at $6,987
Used Dodge Charger"
705 Great Deals out of 30,281 listings starting at $1,995
Used Ford F-150"
3,239 Great Deals out of 216,692 listings starting at $1,000
Used Honda Accord"
1,315 Great Deals out of 78,660 listings starting at $1,395
Used Chevrolet Tahoe"
1,126 Great Deals out of 36,602 listings starting at $1,695
Used Chrysler 300"
576 Great Deals out of 21,309 listings starting at $1,490
Used Ford Taurus"
342 Great Deals out of 23,135 listings starting at $1,400
Used Cadillac DeVille"
2,387 listings starting at $1,600
Used Ford Mustang"
745 Great Deals out of 41,444 listings starting at $900
Used Cadillac DTS"
88 Great Deals out of 1,913 listings starting at $1,995
Used Buick LeSabre"
20 Great Deals out of 2,604 listings starting at $1,450
Used Toyota Camry"
1,653 Great Deals out of 98,470 listings starting at $895