I gotta agree with you - properly maintained a stock 6 volt systems work fine and are reliable.
My first ever 12 volt alternator conversion was to my FIL's Super M about 35 years ago. The tractor was used primarily for operating a mounted picker - usually in the dark. Having enough amps to run several auxiliary work lights were the primary concern. Further, the tractor been "hot rodded" with (high compression head, M&W pistons, etc). So even with the stock 6 volt system in perfect shape, it cranked slow and was sometimes difficult to start - especially when the engine was hot. Pulling or jumping the outfit in the middle of a cornfield was pretty much out of the question. So a 12 volt alternator conversion made good sense for this tractor.
My FIL gave me the tractor when he quit farming. I left the alternator in place since I now use the tractor to skid firewood, push snow and pull hayrides at a friend's Christmas tree farm. Reliable starting in winter weather is reason why.
But I also own two other tractors - a Super H and a Minnie-Mo U. I've left both stock 6 volt because I they serve me well and I just like 'em that way. Besides....to me there's just something "right" about the slow roll then engine catching of a well-tuned 6 volt tractor.
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Bottom line: Unless there's a compelling operating reason to convert to 12 volts, my vote is to retain the stock 6 volt systems whenever possible!
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Today's Featured Article - Gatherin of the Orange - by Rick Nikolich. In July of 1998 I was talking to fellow Allis Chalmers collector Mike Schilling about the annual "Gathering of The Orange" AC show coming up in August of 1999. He got this wild idea that we should get a convoy of AC tractors and drive them from Charlotte, Michigan 105 miles to LaGrange, Indiana.
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