1) If the coil is labeled something like "12 volts for use with ballast resistor" or "12 volts requires external ballast" its in reality a 6 volt coil and will work okay on your 6 volt tractor.
2) If the coil is labeled something like "12 volts" or "12 volts NOT for use with ballast resistor" its in reality a 12 volt coil and the spark could possibly be weak.
3) If it starts n runs fine it must be okay.
Many (not all) typical old tractor circa 40's thru 60's 6 volt ignition coils were around 1.25 to under 2 ohms (1.5 typical) primary resistacne while many (not all) 12 volt coils were around 2.5 to under 4 ohms (3 typical) primary resistance. Many tractors still used the same coil on 6 or 12 volts, its just that if on 12 a series voltage dropping (12 to 6) ballast resistor was added in series with the coil.
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Today's Featured Article - Talk of the Town: The Saga of Grandpa's Tractor - by The following saga is from the Tractor Talk Discussion Forum. Someone. The saga starts with the following message: Hey guys I have a decision to make. I know what you all will probably suggest and it will probably agree with me way down inside, but here it is. I have a picture blown up and framed in my "tractor room" of a Farmall M. It was my Grandpa's tractor, of which whom I never got to meet. He froze to death getting this tractor out of the barn to pull a truck out of the ditch before I was born. Anyway my dad and aunt had to sell it at the auction,
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