IH commonly used a ballast resistor and a 6 Volt coil in their 12 Volt ignition systems and had a setup that bypassed the resistor during cranking for a hotter spark while the battery voltage is drawn down by the starter load.
For more insight into this you can peruse the manuals at the links below.
You will have to copy the links and paste them into the address bar in your browser as they do not support direct linking.
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Today's Featured Article - Madison's County - by Anthony West. Philip Madison has been a good friend of mine for quite some time. He has patiently suffered my incessant chit chat on the subject of tractors for longer than I care to remember, and on many occasions he has put himself out, dropped what ever it was he was doing, to come and lend a hand cranking handles, or loading a find onto a trailer. Although he himself has never actually owned or restored a tractor, he was always enthusiastic and always around helping with other peoples projects.
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