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In and of itself, there is no current in a spark plug. Once a current is supplied, from an ignition coil (via a points distributer), or from a solid state ignition system (directed by a crank shaft sensor) a special ignition grade wire carries the current to the electrode of the spark plug. The primary current for the procedure to take place is supplied by the alternator when the engine is running, or by the battery when the engine is being started.

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14y ago

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