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Re: Perplexing alternator problem

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Author  [Modern View]

05-08-2013 15:11:10

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Pulling a battery cable off to check for an alternator charging is a way if you mess up to get your self very DEAD. Only safe way to check an alternator is this.
#1 check battery voltage with it not running you should read 12.4 volts give or take a tad bit with a volt meter.
#2 start it up and run it say 1500 RPM and check voltage again. You should if it is working read around 13-14 volts. When you unhook the battery with the engine running if the alternator is working it will see a dead battery and try to put out max volts which in turn will fry the VR so it will put out 90 plus volts at 35 plus amps and it takes on millionth of an amp to kill a man for that is like more then 35 million times more then it takes to kill you. That by the way is what the Navy E.T. schools teach

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Sean in PA

05-09-2013 06:21:01

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 Re: Perplexing alternator problem in reply to old, 05-08-2013 15:11:10  
Quoting Removed, click Modern View to see

I agree with you that an unloaded alternator can create very dangerous currents, but a millionth of an amp will not kill a person. You have more than a millionth of an amp coursing through your body constantly, generated by your own nervous system. You only begin to feel anything in the way of a mild tingling at abut a thousandth of an amp.

Deadly current starts at about 1/10th of an amp minimum, and can be higher depending on which part of your body it is flowing through. 1/10th of an amp or higher directly across the heart is usually fatal. But while a full amp across your hand from one finger to another hurts like the dickens, and if it goes for long enough can cause burns, it will not kill you. Some folks have survived lightning strikes where thousands of amps have gone through parts of their bodies for a split second but they survived.

I am not saying to not be careful, just saying that a millionth of an amp is not what you should be worrying about.

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05-09-2013 08:12:38

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 Re: Perplexing alternator problem in reply to Sean in PA, 05-09-2013 06:21:01  
Hey this is as per the U.S. Navy E.T. school in Damneck VA and they teach that 1 millionth of an amp can and will kill a person and I could see how if you have it hit you just right but either way I am just posting what the Navy teaches if not right take it up with the U.S.Navy and tell them they are not teaching things correctly

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05-08-2013 15:18:53

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 Re: Perplexing alternator problem in reply to old, 05-08-2013 15:11:10  
Quoting Removed, click Modern View to see Old, "When you unhook the battery with the engine running if the alternator is working it will see a dead battery and try to put out max volts ..."------max OR nothing, as I already told Greg. Depends on the specific VR installed! I have some of each & if you ever saw the circuitry it is very clear as to the differences & how each behaves. Also easy to demonstrate.

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05-08-2013 15:32:38

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 Re: Perplexing alternator problem in reply to JMOR, 05-08-2013 15:18:53  
Yes one smoke test one way and some another way either way is not a safe or good idea to try for more then one reason the $$ it may cost you or your life

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