I guess its "possible" in translation and in labeling things might? get confusing if different countries are involved ? Another important and limiting factor when it comes to deciding how much total (coil + ballast) ignition circuit resistance is required is to consider the current the ignition points much pass and switch. Typically on many old tractors (sure depends on points design and construction) the current the points must switch is limited to around 3 to 4 max amps, otherwise they will burn prematurely.
THEREFORE at 12 volts if there's 3 ohms of total (coil + ballast) resistance the points current would be 12/3 = 4 amps, while if at 12 volts the total (coil + ballast) resistance were 4 ohms, the current would be 12/4 = 3 amps. As far as ballast resistance, if you wanted a 50/50 voltage divider and used 12 volts as the baseline (higher if charged) and wanted to drop 6 volts across a 6 volt coil and 6 across a ballast, the coils LV primary resistance would be the same as the ballast resistance. However duty cycle and points dwell all play into this equation, and battery voltage will vary subject to temperature, load and state of charge, and charging parameters etc. etc.
Coils (design, voltage and resistance etc) for certain cars or tractors or motorcycles or lawn mowers are certainly NOT all the same...…...
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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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