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OEM Ford applications had a specific length of Resistance rated wire leading from the switched source (Key) to the coil. Initially 12 volts passed and within a couple of minutes when the current began it caused the wire to become warm and increase the resistance rating, causing the voltage drop which would save the points from burning. High performance coils such as Mallorys Voltmaster used a ballast resistor and regular wire to handle the extra current demand.
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Rick
As you slide down the Banister of Life, may the splinters never be pointing the wrong way 
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