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On a point ignition system, the resistor will reduce the incoming voltage to the coil from 14 volts when the charging system is active, to about 9 volts. At a 9 volt level the ignition points will survive for a longer time before pitting and burning.
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actually this is for the fact that when you are starting (the starter is running) a car/truck available voltage drops down because of the electrical load from the starter to about 9 volts. this would be a problem if the ignition system (coil and points/ignition module) was set for 12~14 volts as at 9 volts you may have no spark, so they set the voltage at 9 volts all the time and use the resistor or a built in voltage regulator in the ignition module to bring the voltage down when the car is running and give it full voltage (9 volts) directly when the car is starting usually thru a bypass wire or switched connector.
the condenser/capacitor is what keeps the points from pitting and burning as fast.
and on some cars they did not use a resistor but a resistor wire
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