Just throwing on a 12 volt alternator masks/band aid's the real problem. On a 6 volt system, you MUST have good battery cables and clean, bright, and tight connections. If the cables are old, or if someone has swapped them out for smaller cables suitable for 12 volts, you are going to have starting issues. You need at least 1/0 cables. Then, check the grounds, check the grounds, check the grounds. Then look at the starter. If it hasn't been off the tractor in 40 years, it probably needs to be cleaned and serviced--maybe new brushes installed and/or other stuff. Since it isn't charging I would take the generator to be serviced when you take the starter. It probably hasn't been touched in a long time either. When you re-install the generator, check the grounds check the grounds check the grounds. All connections need to be clean, bright, and tight. Chances are the regulator will need to be replaced, get a good one (Echlin) not a cheapo from Tractor Supply. Yes they can be fussy but I have had minimal problems with a good quality regulator.
Once you do all this, it will start just as fast as a 12 volt system, and it will charge. If you do insist on changing to 12 volts, don't make a mess of it like so many often do by cutting sheet metal, duct-taping electrical systems, and chopping up generator brackets.
And before anyone asks, I have three six volt tractors. One is a "trailer queen" but the other two work for a living. They start and charge reliably.
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Today's Featured Article - Grain Threshing in the Early 40's - by Jerry D. Coleman. How many of you can sit there and say that you have plowed with a mule? Well I would say not many, but maybe a few. This story is about the day my Grandfather Brown (true name) decided along with my parents to purchase a new Ford tractor. It wasn't really new except to us. The year was about 1967 and my father found a good used Ford 601 tractor to use on the farm instead of "Bob", our old mule. Now my grandfather had had this mule since the mid 40's and he was getting some age on him. S
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1965 International Harvester McCormick Farmall cub tractor 2,500. Two owner tractor. My grandfather bought new in 1966, then we inherited it. Have all the paperwork original manual and all maintenance records. It starts and moves. Comes with underbelly mower, plough, and some other attachments.
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