ADLM: I have a 6 volt alternator in my SA for 17 years. Reliability is what count in my books, if it looks like an alternator that is quite fine. Mine cost me about $50. new, same price as a new 12 volt alternator.
This whole issue of better starting of old gas tractors is often misunderstood. You have two separate and unrelated issues; 6 volt or 12 volt and generator or alternator.
6 volts will start any well tuned, pre 1958 gas Farmall, at temperatures down to -40F, as long as it has an excellent battery. 12 volt system will do no better. In fact I have a 6 volt Super A and a 12 volt 130 and a 12 volt 140. If I go to my unheated shop on a cold Canadian winter morning, the Super A will fire up as quick as the other two. What keeps my systems reliable, they are all alternators.
Next issue how do you keep a battery excellent? The alternator has proven to be far more reliable charging system, doesn't matter which voltage one uses. Alternators are by far, less costly to maintain.
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