Final answer:
Spark plug wires are a crucial component of the secondary ignition circuit in a vehicle, along with the ignition control module and spark plugs.
Explanation:
Spark plug wires are part of the secondary ignition circuit in a vehicle. This circuit includes components like the ignition control module and the spark plugs. The secondary ignition circuit works to deliver high-voltage spark to ignite the air-fuel mixture in the engine's cylinders.
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