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A starter (also self starter, self, or starter motor) is an electric motor, pneumatic motor, hydraulic motor, an internal-combustion engine in case of very large engines or other device used for rotating an internal-combustion engine so as to initiate the engine's operation under its own power.he starter motor is used for this purpose and is not required once the system starts running.
A starter relay switch is an electrical component found in vehicles that completes a circuit between the battery and the starter motor when the ignition switch is activated. The starter relay isolates the ignition circuit from the much higher current that the starter motor requires to operate. Continue Reading.