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Re: A couple of really stupid questions
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Posted by Doug in OR on July 26, 2002 at 23:25:50 from (12.225.49.173):
In Reply to: A couple of really stupid questions posted by Scott (TN) on July 26, 2002 at 19:46:46:
The alternator isn't putting anything out if you are reading 12.6 volts. That is normal 12 volt battery voltage. You need 13.8 volts to charge a battery. Also, a GM alternator needs to turn at 1200 RPM, minimum, to start charging.... considering that most older IH tractors turn around 450 RPM at idle, you want a 3:1 pulley ratio, if you can find a small enough pulley for the alternator. If you can't get 3:1, shoot for 2.5:1 One last item: on the Delco alternator, be sure that pin 1 is tied to your ignition switch - either through a diode or through a light. You need this voltage at startup to tell the alternator to start charging. Single wire alternators are okay, but 3-wire alternators charge better at the lower sppeds you find on thactors.
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