Question about Ford F-100

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I have replaced voltage reg ,sileniod ,starter, battery,then alternater went out replaced it with reman alt now wont charge and truck dies when positive side batt terminal is removed

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  • Jeremy W.
    Jeremy W. Mar 22, 2011

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Check all electrical connections from and to the altinator, if everything is good then its possable your remanufacterd altinator is deffective, the parts store can test them for you. You can never trust remaned parts theres always a chance that its a bad part.

Posted on Mar 22, 2011

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How do I check if it is alternater or battery


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I have a 2000 chry town and country the batt light came on the other day ignored it. now tonight when driving it the whole car shut down got a jump then it died again down the road. i jumped car agian...


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The battery kept dying. Buying a new one did not work. Now it will not start after being charged then turned off. Could it be the alternater? Another question, can I put one in my self?


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1 Answer

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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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start the car,, leave the car on and disconect the battery if the car still on the alt is good but if the car turn off Replace the alt

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