When starting, the battery voltage is dragged to 10.8 to 11.5 volts with a good battery. In cold temps, this can be 10 volts, and it also assumes good sized battery cables. When the resistor is in use on a 12v resistor required coil, or a 6V coil, the lowered voltage is reduced to the point that spark is compromised. Thus a resistor bypass puts puts at least 10 volts into a 6v coil making great spark when needed most. When the key is turned to run, the coil is again given its rated voltage. When a 12 no resistor needed coil is used this advantage is just not there. It is commonly used on automobiles and has a history of being a standard method of increasing starting reliability. Jim
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Today's Featured Article - Farming Never Left My Blood - by Stan Gordon. I was born in 1947 youngest of ten of a working farm. Our farm was located in Saskatchewan near Saskatoon. We had a mixed farm consisting of grain and dairy all done with old machinery and by hand. My dad had a tractor, a Farmall A which was used mostly to run the thrashing machine, a seed drill and for plowing. I remember locals used to help each other and threshing was done from daylight to after dark, one farm to another until all farms were done.
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