The Starter Motor of the Nissan Sentra transforms electrical energy from the battery into mechanical energy to rotate the engine. A solenoid mounted externally draws energy from the battery through heavy gauge wire and closes contacts that energize the Starter Motor armature and the surrounding field coils or permanent magnets. The Starter Motor drive gear rotates due to the armature, which spins due to electromagnetic force. The solenoid at the same time drives this gear into mesh with the flywheel or flexplate. The overrunning clutch disconnects later once the engine runs. Two confirmed configurations appear on the Nissan Sentra vehicle: a direct drive unit and a gear reduction type in which a reduction gear links the armature to the drive. This allows for increased torque from a more compact Starter Motor package. Control starts at the ignition switch and passes through a starter relay plus a safety switch, which prevents engagement when the car is in gear. There is a neutral safety switch on automatics or a clutch switch on manuals that ensures the Starter Motor works only under safe conditions for every Nissan Sentra engine start.
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