GREAT possible catch by my friend Jim there, when I read your words AUTOLITE I also wondered if it may be a Class B Genny???
Some Fords used the Class B system while most other old tractors used Class A Delco systems. AND THE VOLTAGE REGULATORS AND CHARGE REGULATION CIRCUITS ARE DIFFERENT !!!!!!!!!!!
Okay ifffffffffff it a Class A Genny (may NOT be since its Autolite) and she full charges allllllll the time even if theres no connection to FLD post its possible the post nut got overtightened (broke insulting pass through) and is shorted to case frame ground. That would make them alwaysssssssssss full bore max charge!!!!
Buttttttttt if its a Class B genny the other end of the internal field coils (NOT end where post is) is dead grounded to case frame so full voltage on the post makes them full bore max charge.
Sooooooo to lower the charge if its a Class B the current limiting resistor like light switch controllers use must be between the hot voltage source and the gennys FLD post. Its max charge if full voltage on on FLD but its less if theres a resistor between hot voltage source and the gennys FLD post.
One you determine if you have an A or B genny its not rocket science to reduce the charge rate, it just depends on how/where the resistor is placed. On an A it between FLD posy and ground,,,,,,,,,if a B its between hot voltage source and FLD post.
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