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Alternator Overcharging

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Andy

07-02-1999 07:40:04




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ACDelco Alternator installed on a 930 Case (in place of Generator) is WAY overcharging. Already burned out a set of lights
and curcuit breakers. I know the Alternator works as I am using it from a JD 60 I converted last winter. I switched them when
I started having trouble thinking maybe it was bad. I also tried a "Single" wire Alt from an auto shop which did not charge at all.
This thing Really has me baffled as I have eliminated all possibilty of shorts etc. Also, the system was already set up as a
Negative ground so I am sure the polarity is correct. Any ideas? It's on the charger tonight to see if maybe the battery is
undercharged but it was strong enough to easily start the tractor and run lights etc.

Any ideas would be greatly appreciated!

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Andy

07-02-1999 11:05:53




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 Re: Alternator Overcharging in reply to Andy, 07-02-1999 07:40:04  
The battery seemed to be in VERY good condition during all of this but I placed a trickle charger on it for all of last night. When I
tried it around noon to test the grounding of the Alternator, it still charged quite high. While I was preparing a jumper to go directly
from the mounting bolt of the alt to the Neg post of the battery, it started to decreas and finally go down to about 1-3 amps on it's
own. The response to lights being turned on and off etc. triggers current but not past 20 amps, it then subsides. When turned off
and restarted, it charges high for a few moments then goes down again (as expected). I am assuming that all is well again but am
not totaly convinced that the Battery was at fault or maybe the system was slightly isolated and finaly found a good ground etc.
Thanks for the reply. Andy

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