Question about 1998 Mercury Grand Marquis

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1998 Mercury Marquis: Battery indicator light blinks in random, unpredictable ways (not all the time), even though battery is good. Could the sensor be old and unreliable? Or would you trust sensor and look for some other cause?

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The light comes on when the alternator voltage/current is low or if there is a short that is draining the battery. If it's blinking, the voltage is probably near the lower limit of acceptable voltage. Recommend checking voltage at the battery with car running. Should be at least 14 volts. If you don't have a voltmeter, take the alternator off and have it tested at the parts store. Let us know if you have more questions.

Posted on Oct 02, 2010

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I have a 1987 mercury grand marquis with v8 my alt is new my battery is new and my battery keeps going died what wrong help


A lot of alternatives even though they are new can be no good, remove the negative battery cable, if the car continues to run, you have a bad alternator

May 01, 2017 | Mercury Cars & Trucks

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I have a 99 mercury grand marquis ls the battery light flashes on and off while I'm driving not repeatedly maybe about four times while I'm driving had the alternator checked it was good repla


Battery may have broken plates in cells or cracked plates. May show battery is good , but i would replace it.
Also, starter solenoid may be bad, replace starter as needed.

Jan 21, 2013 | 1999 Mercury Grand Marquis

1 Answer

Battery light comes on and off in 1998 mercury grand marquis


Sounds like the voltage regulator in the alternator. Or the alternator is going out.

Nov 04, 2012 | 1998 Mercury Grand Marquis

1 Answer

Replacing voltage regulator in mercury grand marquis


CChange battery and clean the terminals. The alternator is not designed to be your main power supply - it just keeps your battery charged - which is your primary power supply

Nov 15, 2011 | 1998 Mercury Grand Marquis

1 Answer

When I turn the key on my 1998 grand marquis, it makes a really loud clicking noise. all the electronics work though


symptoms indicate low battery or bad connection at terminals but could also be solenoid. Requires troubleshooting.

Please see my tip at http://www.fixya.com/cars/r5821173-doesnt_car_start_gasoline_engines and let me know if you have questions.

Sep 21, 2010 | 1998 Mercury Grand Marquis

1 Answer

Battery light, charge/discharge, comes on and stays on. Had the alternator checked and installed a new battery.


There is a diode inside the alternator that controls the charge light. It is possible for this diode to go bad even thought the alternator is charging like it is supposed to. Only way to really tell is to replace alternator.
Hope this helps

Aug 26, 2010 | 1998 Mercury Grand Marquis

2 Answers

I was told the alternator was bad and drained the battery. I changed both and the battery was dead the next day. 1998 mercury grand marquis


assuming the repair was done correctly the you need to clean/repair the battery connections this should fix ya
hope this helps.

Jul 15, 2010 | 1998 Mercury Grand Marquis

2 Answers

The brake light comes on, on the dash. Brakes work O.K.2003 mercury grand marquis. 112000 miles. the dealer says the pads are good.


Make sure your emergency brake pedal is all the way up, because sometimes if it goes down one notch, that can trigger that light to come on..It wont be enough to drag or slow the sar down, but it will be enough to turn that light on...Also even though your brakes are good..double check your break fluid level...

Dec 07, 2009 | 2003 Mercury Grand Marquis

1 Answer

Replaced battery in 2001 mercury grand marquis


check terminals, might be cracked or not tightened good

Mar 08, 2009 | 2003 Mercury Grand Marquis

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