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How can you tell if alternater is going bad - 1999 Ford Expedition

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  • Shuvit2331
    Shuvit2331 Feb 23, 2012

    Is your battery always dead?



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Yes the battery will run dead after charging it very quickly. If you put an alternator to the test with a DC volt meter it should produce at least 13.2 volts even under a heavy load. Any Autozone or Advance auto parts will test the battery and the Alternator for free.

Posted on Feb 23, 2012


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Not charging

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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