The Nissan Quest Starter Motor is the electrical device that gives the engine the mechanical spin to wake it up. In other words, it converts electricity from the battery into rotation of the crankshaft after it turns the key. The system employs an electric Starter Motor that is energized by a solenoid mounted on the fender, which passes heavy-gauge current into an armature surrounded by either field coils or permanent magnets. Electromagnetic force from the electrical current completes the speed of the armature. The attached drive bevels with the flywheel ring gear, and the overrunning clutch disengages at once after the engine fires so that parts will not overspeed. In the early versions, a direct drive layout was employed, while later gear-reduction Starter Motor designs included a small reduction gear between the armature and the drive. These designs are capable of producing greater torque to ensure a reliable start with a lighter unit. Whichever version you may examine, the solenoid is energized through a relay loop that is triggered by the ignition circuit and includes a neutral or clutch safety switch so that the vehicle cannot crank in gear. All Quest vans with automatic transmission have a neutral safety switch, while manual ones employ a clutch switch. Due to the similarity in electrical architecture provided by Nissan to generations, swapping between direct-drive Starter Motor assembly and reduction Starter Motor assembly remains easy. The gear-reduction Starter Motor provides quieter operation and better cold-weather performance on Nissan Quest.
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