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They are part oft he electrical system. The alternator is driven round and round by the fan belt, and when turning generates 12 volts that charges the battery AND feeds back through the wiring harness to the distributer, which feeds the spark plugs, which fire the engine. Once a motor vehicle starts ( using the battery as the power source) the alternator essentially drives the spark plugs to run the motor to turn the belts to drive the alternator to provide power to the spark plugs.... and, and, and...

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Q: What is the relationship between spark plugs and alternator?
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