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Alternator over charging

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Michael

12-26-1999 17:59:36




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12v prestolite alternator putting out 17v+ into a good battery, amp gauge reading 30 amps. One wire set-up with regulator on back of alternator. What give this is too much for the battery and lights. No shorts apparent.




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Gerald J.

12-26-1999 19:39:37




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 Re: Alternator over charging in reply to Michael, 12-26-1999 17:59:36  
Anything over 14.2 volts is too high for decent battery life. The internal regulator has shorted. Its time for a replacement regulator at least if not an alternator.

Gerald J.



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Spokerd1

12-26-1999 18:12:01




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 Re: Alternator over charging in reply to Michael, 12-26-1999 17:59:36  
Volts are a little high , not too high , is about what an Alt. should put out but the amps are fine. It is possible to run a 60 amp or higher Alt. but about 14 volt



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RonMC

12-27-1999 07:56:12




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 Re: Re: Alternator over charging in reply to Spokerd1, 12-26-1999 18:12:01  
Hi - The voltage seems a little high - usual is 14.2 area, but suggest you attach a different battery and test it again - the batt may be partially shorting internally. Have seen this quite a lot lately on automotive, and it is usually the voltage that tips it off. You can use your car battery, just connect it with jumper cables, but pull off the neg. terminal to isolate it from the car, and do the same with the battery in the tractor. If the voltage/amperage are more reasonable when charging your car, it will be the tractor battery that is bad.

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