I would say that probably not. Most newer alternators (1970s and up) have the voltage regulator built into them. Only the old ones would need an external regulator. But it all depends on the age and design of your alternator. If you could get a model type, you may find more about it. These tractors are designed to be almost 100% mechanical. Some even had a crank handle (but no one could turn it). The only electrical needed is to start the tractor, and lights if running at night. Other than that, it runs completely mechanical. (although most people convert the fuel pump to an electrical one, which is one more thing the battery is needed for) Good luck. P.S. I converted one of mine to 12 volt alternator with a kit, put in new wires and guages and lights from wallymart, and it cost me very little maybe $150.
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