Are their spark plug wires on an 2001 mercury grand marque?

Yes, there are spark plug wires on a 2001 Mercury Grand Marquis. The spark plug wires are responsible for conducting the electrical current from the ignition coil to the spark plugs, which then ignites the air/fuel mixture in the engine's cylinders. The spark plug wires are typically made of a conductive material, such as copper, and are covered with an insulating material to prevent electrical leakage.