A mid 1950s International would have come from the factory with a 6 volt battery with the positive post of the battery hooked to the ground strap, and the negative post hooked to the cable going off towards the starter.
It will work the other way, but your generator needs to be 'excited' in the proper direction. If you hook it up different ways, your generator might forget which way it goes and do nothing.
I would suggest hooking it up with the positive battery post going to ground as it came from the factory, and if the generator doesn't put out anything, you need to polarize it, or excite it the right way.
(Your generator keeps a tiny bit of magnetism in it which says which way the electricity flows - when you hook it up backwards this messes up that bit of magnetism and you need to reflow it... That is what the polarity or excite means....)
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Today's Featured Article - A Lifetime of David Brown - by Samuel Kennedy. I was born in 1950 and reared on my family�s 100 acre farm. It was a fairly typical Northern Ireland farm where the main enterprise was dairying but some pigs, poultry and sheep were also kept. Potatoes were grown for sale and oats were grown to be used for cattle and horse feeding. Up to about 1958 the dairy cows were fed hay with some turnips and after that grass silage was the main winter feed. That same year was the last in which flax was grown on the farm. Flax provided the fibre which w
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