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 - History of the Cockshutt Tractor - by Danny Bowes (Dsl). The son of a very successful Toronto and Brantford, Ontario merchant, and himself quite an entreprenuer, James G. Cockshutt opened a business called the Brantford Plow Works in 1877. In 1882, the business was incorporated to become the Cockshutt Plow Company. Along with quality built equipment, expedious demand and expansion made Cockshutt Plow Works the leader in the tillage tools sector of the farm equipment industry by the 1920's.
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