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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.
Part of that system is a starter solenoid. The cylindrical solenoid is a low-amperage relay that safely completes the high-amperage electrical connection between the battery and starter motor when the ignition key is turned. A bad solenoid can deny electricity to the starter motor and prevent engine startup.. Check all electrical connections between the battery, solenoid and starter motor to see if they are tight and free of corrosion. Typically, the battery is in the engine compartment or under the operatorâs seat. The starter motor is a vertical metal cylinder about 6 inches long mounted on the side of the engine.