With all due respect I think whoever told you that is blowing smoke. Only thing a bigger alternator pulley does is increase the engine RPM's where the alternator starts to charge.
Further batteries care ONLY about voltage - not alt pulley diameter, tractor brand/color, etc.
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Incidentally we had a CIH 9280 that ruined a brand new set of batteries in less than 3 weeks. Turned out the VR was bad - it was holding system voltage around 15.8 volts. This quickly boiled the new batteries into junk. (However for working after dark the lights were wonderfully bright!)
Replacing the regulator - also replacing an inoperative voltmeter in the dash panel - solved the problem.
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Today's Featured Article - Tuning-Up Your Tractor: Plugs & Compression Testing - by Curtis Von Fange. The engine seems to run rough. In the exhaust you can hear an occasion 'poofing' sound like somethings not firing on all cylinders. Under loaded conditions the tractor seems to lack power and it belches black smoke out of the exhaust. For some reason it just doesn't want to start up without cranking and cranking the starter. All these conditions can be signals that your unit is in need of a tune up. Ok, so what is involved in a tune up? You say, swap plugs and file the points....now tha
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