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Re: Can someone please tell me why this is happening??? (...


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Posted by John T on November 14, 2010 at 17:23:01 from (66.244.97.31):

In Reply to: Re: Can someone please tell me why this is happening??? (... posted by RTR on November 14, 2010 at 17:02:28:

YESSSSSSSSS Theres a huge monumental DIFFERENCE in a voltmeter versus an ammeter

An "ideal" ammeter is a series pass through in line current monitoring device with ZERO ohms resistance. It usually has 0 in the middle and then maybe 20 to 30 amps on either side to indicate + charge or - discharge battery current

A "ideal" voltmeter is a paralell divice used to measure voltage drop and has infinite resistance. They usually start at 0 on the left side then go to say 15 to 20 or so volts full scale on the right.

YOU NEED AN AMMETER

When you said one side had voltage (I assume to frame ground) while the other did not that made me think its NOTTTTTT an ammeter and why its not working as you intended. If theres no voltage on the side to teh alternator IT CANT EXCITE THE ALTERNATOR TO MAKE IT CHARGE.

If its a voltmeter and one sides on the battery (via cable at starter) when you turn the switch youre using the alternator as the ground return (it has some resistance) and you may be measuring 12 battery volts less the drop and getting that 11 volt ?? reading

Its either a bad ammeter (its open not a near short) or a voltmeter Ima thinkin since any ammeters Ive seen have 0 in the middle notttttttt on left side like most voltmeters Ive seen.

Best guess:::::::: Its a voltmeter and youre using the alternator as ground

Im interested in what Jim N or Bob thinks of all this??????????????

John T


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