Question about 1996 Mercury Grand Marquis

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The car wont take a complete charge

I have replaced the alternater and the battery but the car doesnt seem to take a complete charge to keep running any ideas

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If able, ck the charging voltage at the battery. The alternater should be charging the battery between 13,6 to 14.2v. The lower the voltage the more its charging. Make sure both battery cables are clean and tight. Good Luck.

Posted on Jun 18, 2009

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How do I check if it is alternater or battery


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First tell me why you don't think it's charging.
Because of the voltage reading you are getting at the battery terminals? The range you want is between 13.6v to 14.2v. The higher the voltage the lower the amps. and true the other way, the lower the voltage the higher the amps. If you get a reading of 13.6v or lower, the alt is nearing or at max output. An alt can only run at maximum for around fifteen minutes and it will start slinging solder from overheating. It's a good indication the battery is either totally dead or junk. Charging above 14.2 the alternater is running wide open and is only putting out high volts which will cause the battery to boil , in turn destroying it. This is a bad alternater. All alternaters have integrated voltage regulater with the exception of ver few of the earlier ones. You cannot test an alternater by removing a battery cable to see if the engine keeps running without taking great risk of damaging the alt, regulator. So tell me why you feel it isn't charging. Remember an alt is not made to charge dead batteries. Their sole function is to maintain the battery charge. Without a battery, the alt won't last 10 seconds.
Hope to hear from you and good luck.

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