This is how it works on paper: Due to voltage drop while cranking the engine, the voltage to the coil also drops. This causes a weak spark that may not be sufficient to start the engine. To remedy this, we use a lower voltage coil that will provide a nioe hot spark at cranking voltage. Once the engine starts, and the starter load on the battery is removed, voltage rises. To accomodate this, a resistor is used to drop the voltage back to the cranking voltage AT THE COIL. To accomplish this, the start button or key switch has a circuit that BYPASSES the resistor during cranking. So, when you are holding down the starter button, the resistor is bypassed and you have spark to start the engine. When you release the button, the circuit is broken, and the engine stalls because the resistor is probably burned out causing the broken circuit. Surprisingly, these resistors take a lot of stress while in operation, and are a relatively common failure, but not as common as I would have expected.
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