I would imagine an A could idle for literally days on a tank of gas.
An alternator needs RPMs to charge effectively, though. Cars normally idle at around 1000RPM, while an A is more like 450RPM. Full throttle for an A is barely off idle for a car.
I would recommend a bigger alternator, like a 105 Amp, and a way to spin it faster with the tractor at idle. Since the pulley on the alternator itself is about as small as it can get, all you can do is go bigger on the crankshaft, or introduce another multiplying pulley in between. What I mean is two pulleys connected together on a common shaft. Crankshaft drives the small pulley, big pulley drives the alternator.
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Today's Featured Article - A Tractor's Point of View - by John Manley. I began my life on August 3,1941. I was actually built at different times and days but I was officially an M Farmall on August 3.I was real nice and shiny. That�s me, in the old picture, third from the left. I was loaded on that train and sent to a little town in South Carolina. I didn�t get to see much of that town. I was moved off the train fast and on to the dealer�s
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