You should have around 12 volts on the small + and - wires into and out of the coil. The big wire out the top will only have voltage for an instant when the points open and close, you don't want to be touching it then because that's the ignition spark - probably 20,000 volts.
If you're not getting a spark, replace the points and condensor. Make sure you set the point gap correctly. Or replace them with electronic ignition for about $100 from one of the advertisers on this site.
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Today's Featured Article - Harvestin Hay: The Early Years (Part 2) - by Pat Browning. The summer of 1950 was the start of a new era in farming for our family. I was thirteen, and Kathy (my oldest sister) was seven. At this age, I believed tractor farming was the only way, hot stuff -- and given a chance I probably would have used the tractor, Dad's first, a 1936 Model "A" John Deere, to go bring in the cows! And I think Dad was ready for some automation too. And so it was that we acquired a good, used J. I. Case, wire tie hay baler. In addition to a person to drive th
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