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99 grand marquis the battery light would come on and off so i replace the battery... battery light stil came on. So i replaced the alternator now the battery light comes on an stays on once my car has heated up. I dnt know if i have a regulator and idk if that cud b the issue i do not think its the belt. But i plan on replace the battery cable... i took it back to autozone they said my battery was good but my alternator bypass the test.. not everytime but somtimes it does not want to start n stay running..wat could this be

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  • Cars & Trucks Master
  • 11,753 Answers

You should use a motorcraft alternator , Not aftermarket ! Do you know how to do automotive electrical circuit testing ? Voltage drop testing , How to read an use a wiring diagram to pin point places in a electrical circuit to do tests ? Do a charging system voltage drop testing , test engine ground etc...
The Trainer 47 What measuring voltage on the ground side means


Electric Testing Techniques You Need to Know
There is a lot involved in find electrical gremlins if you don't know how to test . A couple basic test with a voltmeter is usually all it takes !
Starter Voltage Drop
How to Test an Alternator

Mastering Voltage Drop Testing with Pete Meier and Jerry Truglia

Posted on May 12, 2017

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Posted on Jan 02, 2017

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samson-1
  • 153 Answers

SOURCE: alternator light on

The alternator is not producing any power . If it were the engine would run without the battery. Check the wiring on the alternator. It must ave an exciter wire to make it work.

Posted on Oct 07, 2008

  • 150 Answers

SOURCE: interior lights on

Try disconnecting the negative battery cable for a minute or two. Then re-connect cable and start the car. Good luck.

Posted on May 23, 2009

czaa
  • 4525 Answers

SOURCE: I have a 2008 Hyundai Accent. About 2 weeks ago

after u had it jumped u drove it to the zone so the alternator was workin--it seems like the regulator is not functionin to charge batt--theres somethin goin on in the electrics thats frying ur reg these new cars r very complex--do a scan to see any bad codes and a harness wire chec may be helpful

Posted on Aug 15, 2010

  • 436 Answers

SOURCE: Daughter called me ..car wont

it sounds like you have blown fuse to the Alternator.. I don't know what car you are talking about but they charging systems vary.. But if alternator isn't getting all the power it needs it won't charge. this should be checked.

good luck

Posted on Oct 21, 2011

redds55
  • 2620 Answers

SOURCE: 2003 Mazda Tribute battery light staying on

With the engine running check the voltage coming out of the alternator with a digital multimeter it should be no less than 13 volts and no more than 15 volts.

Posted on Jan 21, 2012

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1 Answer

How to reprogram the computer on a 1999 Grand Marquis


You cannot reprogram the computer. You have to replace it. Load test the alternator. If a diode is bad it will charge the battery at a slower rate but will still light the battery warning light.

Dec 18, 2015 | 1999 Mercury Grand Marquis

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How To Install Replace Taillight and Bulb Mercury Grand Marquis 99-02 1AAuto.com

on May 18, 2012 | 2001 Mercury Grand Marquis

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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

Electrical short?


Not a short.
Either the circuit to the battery light is bad, or the fuseable link on the starter solenoid is toast. There is a 30 amp fuse in addition to the fuseable link, plus a 15 amp fuse on the circuit for the battery light.
All of these circuits need to be tested.

Aug 30, 2012 | 1993 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

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

1 Answer

HI, I HAVE A 99 GRAND MARQUIS WITH LIGHTING PROBLEMS THAT DRAINS BATTERY.AT FIRST THE INTERIOR LIGHTS CAME ON AT ANY TIME.I REMOVED ALL INTERIOR BULBS.NOW I AM SHOWING A SHORT IN FUSE 11 IN HI-AMP FUSE...


the LCM is under the dash just above the steering column. It is $400. Get one on ebay only for your year and model. others won't work.

pleae rate

SECTION 419-10: Multifunction Electronic Control Modules 1999 Crown Victoria/Grand Marquis Workshop Manual
REMOVAL AND INSTALLATION Module —Lighting Control (LCM) Removal
  1. sxa~us~en~file=ani_caut.gif~gen~ref.gif CAUTION: Prior to removal of module, it is necessary to upload module configuration information to New Generation STAR (NGS) Tester. This information needs to be downloaded into the new module once installed. For additional information; refer to Section 418-01 .
    sxa~us~en~file=ani_caut.gif~gen~ref.gif CAUTION: Electronic modules are sensitive to electrical charges. If exposed to these charges, damage may result.
    Disconnect the battery ground cable.
  1. Remove the LH instrument panel lower insulator.
    1. Remove the pin-type retainers.
    1. Disconnect the courtesy lamp.
    1. Remove the LH instrument panel insulator.
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  1. Position the LCM aside.
    1. Remove the screws.
    1. Release the locking tab.
    1. Position the LCM aside.
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  1. Remove the LCM.
    1. Disconnect the electrical connectors.
    1. Remove the LCM.

Nov 19, 2009 | 1999 Mercury Grand Marquis

2 Answers

Merc Grand Marquis, starts, idles rough for few seconds and dies.


HI if you rev up the rpms does your light stays on ,If thats the case you need to replace your alternator have it check at autozone or rally s auto parts for free

Sep 25, 2009 | 1993 Mercury Grand Marquis

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