The Volkswagen Jetta Starter provides a burst of mechanical motion that spins the crankshaft, allowing the engine to start with the simple twist of a key or a button press. Taking direct current from the battery through thick cables, a remotely mounted solenoid completes the circuit, pulls a small drive gear forward, which in turn engages the flywheel, and then activates a small electric motor enclosed by the housing. Within it, an armature surrounded by a field of permanent magnet coils rotates, and it is the brushes and a commutator that control the current to facilitate smooth movement. When the armature rotates, the drive will engage the engine, and an overrunning clutch will soon decouple it when combustion assumes control to avoid damage. The new Volkswagen models are based on a gear reduction design, which multiplies torque while reducing weight, but some older Jetta models had larger direct drive assemblies that required heavier wiring. Other than the well-known electric design, pneumatic and hydraulic Starters have been applied in special purpose applications in automotive history, but the effective electric design is the standard in general purpose Volkswagen passenger cars. The ignition relay, neutral or clutch switches, and the Starter control circuit are all safety devices that can ensure that the engine cannot start as long as a gear is selected, and this aspect of the Starter control circuit proves how considerable reliability has been incorporated in the overall engineering of the Volkswagen.
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