car dies while driving then wont start on 1990 Ford Crown Victoria

My cars amp (battery light came on about a week ago. I kept driving it then it died thought it could be one of three things the ignition module, battery, or the alternator. I ended up replacing all three. The battery is small for my car i was told but it was the same one that was in there for the last couple years. After i replaced the parts it ran again for three days then it would die again?? Dont know what to do?? The year is 1987

by in San Jose, CA on August 18, 2009
2 answers
ANSWER by on August 18, 2009
If the battery light comes on the engine's alternator is not charging the battery and at that stage you are running purely on the car's battery. Put a voltmeter across the battery terminals at rest a fully charged battery should read 12.6 volts start the engine the volt meter should now read approximately 14.7 volts if not the battery is not being charged. With the ignition key on in the run position the light green/red wire should bring power to the alternator to energize it. there are two fuse links one green and one brown that protect the alternator I suspect one of those may have blown if you have already replaced the alternator. I hate replacing parts without proving they are defective.
ANSWER by on April 26, 2014
Well my issue was the battery. My car cut out on me at random times, went to autozone they checked everything and told me it was battery.

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