Quote:
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A coil with an internal resistor is to reduce the voltage to the points. Points do not like 12 volts.
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Kettering (developer/refiner of the coil/points ignition) found that 4 amps is about the practical limit for current in a points type ignition. Thus resistance to limit current through the coil.
Discussion of the difference in resistance of a 6v and 12v coil at
http://www.yesterdaystractors.com/cg...rtips&th=26558 - and the use of resistors to achieve a correct current.
Joe K