If all the connections are perfect then 2 6v batteries should work better.
BUT the connections are never perfect so you loos a lot.
I switched from the std 2 6volt batteries on my dad's 966 to one 12 volt that looked like the 6 volt batteries just twice as wide.
Best thing I ever did we would get about 5+ years of trouble free starting before we started getting problems. The 2-6v started having problems much sooner
Also the cold weather got a lot better as the faster you turn over a desiel the better it starts.
The connections are actually more important in the real workd.
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Today's Featured Article - Tractor Traction - by Chris Pratt. Our first bout with traction problems came when cultivatin with our Massey-Harris Pony. Up till then, this tractor had been running a corn grinder and pulling a trailer. It had new unfilled rear tires and no wheel weights. The garden was already sprouting when we hooked up the mid-mount shovel cultivators to the Pony. The seed bed was soft enough that the rear end would spin and slowly work its way to the downhill side of the gardens slight incline. From this, we learned our lesson sinc
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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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