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Kelly: One of the problems converting a Farmall 300 and like tractors to alternator is space under hood for the regular GM Delco alternator. It will fit in but you get little room for adjusting belt tension. So your best bet is find a smaller alternator. I have no personal experience with this, however I've been told alternators from Toyota, Nissan, etc. will work. I agree with Bob on one point, keeping it 6 volt is still the very least expensive option. There is no question 6 volts will start these tractors sucessfully. We have 60 years proof on that one. Many people view the problem at hand as a 12 volt versus 6 volt problem. That is a completely false assumption. The real problem here is a better charging system, and with that said, no question the alternator with built in regulator is far superior to a generator and regulator. More economical to buy and maintain as well. I fought for years with generators, regulators, etc., batteries never really in top charge for starting, buying new batteries as a result. I must have a bushel of generator parts and regulators. In early 1990s I did two conversions, Super A, 6 volt alternator with built in regulator, 2 wire giving push button switch on dash for exciting alternator, new 6 volt battery (92) still in tractor. Farmall 130, 12 volt alternator conversion, same basic set up as Bob's diagrams, again 92. 130 is now on its 3rd battery, not entirely fault of system. I will guarentee if two guys go to my unheated shop on a cold morning, the guy who picks the Super A will be going first, even with that now 12 year old battery. 130 battery is less than 2 years old.
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