John: Actually quite a simple task, measure the box and go to NAPA. Why anyone would switch a C to 12 volt is beyond me. Tune up the tractor ignition system, charging system and cables, and 6 volt will start a C anywhere in North America, that you can stand to be out in the cold for 10 minutes. Good for minus 40.
I once started a 6 volt Farmall 300, unassisted by anything other than the tractor's own battery at -40F.
I have a 6 volt SA, 12 volt 130 and 12 volt 140, all have alternators. Been 18-19 years since I did the SA and 130. 5 years on 140. At -20C roughly -2F my Super A will fire up just as fast as the other two. Super A has been a lot less trouble, first 6 volt battery lasted 13 years. Never got much more than half that out of a battery before. I give the credit to excellent charging. 18 years later the SA has had one new battery, and that is total electrical repair other than plugs, points and condenser.
Farmall 130, 12 volt alternator at same time as I wanted to operate a 12 volt motor. 18 years later it's on 4th battery, 2 nd alternator and $217. rebuilt starter, caused from spinning too fast and centrifical force dislodged the armature whindings.
Plain and simple these little engines spin too easy if compression is off 30 psi from new. Low compression engines don't fire up quite as quick, spin faster and longer, therein lies the death of a 6 volt starter. Sure you can go 12 volt in H-M and larger, those engines cause enough more resistance to load the starter.
Let me assure you, next time I need batteries for 130 and 140, they will become 6 alternator tractors. I no longer have the 12 volt motor.
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Today's Featured Article - Identifying Tractor Noises - by Curtis Von Fange. Listening To Your Tractor : Part 3 - In this series we are continuing to learn the fine art of listening to our tractor in hopes of keeping it running longer. One particularly important facet is to hear and identify the particular noises that our
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