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Auto Electrical Guide
The parts that make up your vehicle’s electrical system: what they do, how they work and the signs they give when they fail.
MOLL What is a car battery?
A car battery stores electrical energy chemically and delivers the high current needed to start the engine. Types, lifespan and failure signs.
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AS-PL What is an alternator?
The alternator charges the battery and powers the vehicle’s electrical system while the engine runs. Design, working principle and failure signs.
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AS-PL What is a starter motor?
The starter motor is a battery-powered DC motor that cranks the engine to start it. How it works, types and common failure signs.
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AS-PL What is a voltage regulator?
The alternator voltage regulator keeps charging voltage stable, protecting the battery and electronics. Function, types and failure signs.
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AS-PL What is a starter solenoid?
The starter solenoid is the electromagnetic switch on the starter motor that engages the pinion and switches the high starting current.
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AS-PL What is a starter drive (Bendix)?
The starter drive (Bendix) is the pinion with a one-way clutch that transfers the starter’s rotation to the flywheel. How it works and failure signs.
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AS-PL What is a rectifier (diode bridge)?
The rectifier converts the alternator’s AC output into the DC used by the vehicle. Design, failure signs and testing.
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AS-PL What are alternator brushes?
Alternator brushes are graphite blocks that carry field current to the rotor. Function, lifespan and signs of worn brushes.
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