A 6V coil produces a hotter spark during cranking when the battery voltage is sagging from the load of the starter.
When cranking the 12V coil may only be seeing 9-10V. The 6V coil will still be in the 5.5-6.0V range because there isn't as much voltage drop across the resistor at the lower voltage.
Some solenoids have an "I" terminal on them designed for providing 12V direct to the coil during cranking, bypassing the resistor with a second wire straight to the coil +. So instead of 5.5-6V the coil is seeing 9-10V, and gives an extra-strong spark for that short period of time, making starting easier.
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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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