STARTING SYSTEM:

 A starter motor, ignition switch, battery, and cables, which comprise the starting circuit, provide the power for cranking the engine. The motor receives electrical power from the battery and converts it into mechanical power which is transmitted to the engine through a drive pinion gear  and the flywheel ring gear. The ignition switch controls the operation by making and breaking the circuit between the battery and the starter motor.

THE STARTING SYSTEM

The battery, starter motor, ignition switch, and the wiring are all designed for the high current flow needed to produce efficient cranking power. The condition of these components is extremely critical, as even a small amount of resistance can cause a marked reduction in cranking ability. This indicates the necessity for testing the various components in the starting system.

The starter motor is connected in series with the battery. This is shown as the high-amperage circuit. The solenoid is the switch between the battery and the starter, and is activated by a low current carrying circuit known as the control circuit. The another work done by solenoid is to engage the drive pinion gear of starter motor with the flywheel ring gear, when the ignition switch starts to crank the engine.