It definitely would have been 12 volt. 140 electrical changed 4 times during production. It went from 6 volt generator, two different systems with 12 volt generator and finally 12 volt alternator. I have the wiring diagrams for all 4 systems and the serial number split when the changes occured.
If you wish give me the serial number and I can tell you exactly what you have. You are very close to models with alternator, in fact I think it happened prior to 74. I only have the figures on serial number, and have never translated those into years.
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Today's Featured Article - The Day Mom Drove the 8N - by Brian Browning. My Dad was wanting to put in a garden but couldn't operate the 8N and handle the old horse drawn plow he had found and rigged up to use with the tractor. Well, he decided to go get Mom out of the house and have her drive the tractor while he walked behind the plow. You got to understand that while my Mom is a hard worker who will always help whenever she can... she had never operated farm machinery before that day. Dad got her out there, explained how the clutch was the same as in our o
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