Question about 1992 Mercury Grand Marquis

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I changed the alternator and had the battery tested (ok) in my 1992 mercury grand marquis. It is obvious the old alternator was bad, but the car is still not charging.

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Check for a alternator fuse in the fuse box in the engeine compartment

Posted on Nov 12, 2010

Testimonial: "TY very much. I did find the fuse before you posted, but you diagnosis is right on."

  • jamie_harlan Nov 14, 2010

    I actually found the fuse by tracing the wires from the alternator to the fuse box. The voltage regulator on the alternator was not working. I determined this by disconnecting the harness at the alternator, and read the voltage at the battery. There was no change. It was holding at 12.1. I found the fuse in the fuse box. It is a 30 amp. TY so much for responding.

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Posted on Jan 02, 2017

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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.

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My car is having power problems. My battery has tested positive, my alternator has tested positive, and I've had my starter fixed. Any idea what else could be causing my car's power problem?


Check Ignition Terminal For Bad Connection Also check Solenoid Coil For Bad Contact ...Also Check Alternator Regulator for Over Heat Diode ..the Current will drop and short Battery and probebly burn fuse and Relay...

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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.

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The car has power but the starter Solenoid Switch just clicks


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Aug 07, 2009 | 1992 Mercury Grand Marquis

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