Which of the following is NOT considered a part of an automobile's charging system?

The ignition coil is not considered a part of an automobile's charging system. The charging system primarily involves components that generate and maintain electrical energy for the vehicle's electrical systems and to recharge the battery.

The alternator is responsible for converting mechanical energy from the engine into electrical energy, which not only powers the vehicle's electrical systems while the engine is running but also recharges the battery. The battery serves as a reservoir for this electrical energy and provides power to start the engine. The voltage regulator manages the output of the alternator, ensuring that the electrical system receives a steady voltage and preventing potential damage from overcharging.

In contrast, the ignition coil is part of the ignition system, which is responsible for igniting the air-fuel mixture in the engine's cylinders. This distinction highlights why the ignition coil is not involved in the charging system.