What is a Alternator?
An alternator is a key component in a vehicle's electrical system, responsible for generating electrical power. Driven by the engine via a belt, the alternator converts mechanical energy into alternating current (AC), which is then transformed into direct current (DC) by a rectifier. This DC electricity is used to charge the car's battery and power various electrical components while the engine is running.

The alternator consists of a rotor, stator, diode rectifier, and voltage regulator. As the engine spins the rotor within a magnetic field, AC voltage is induced in the stator windings. The rectifier converts this AC voltage into DC, and the voltage regulator ensures a consistent output. The electrical energy generated by the alternator not only charges the battery but also supplies power to lights, sensors, ignition system, and other accessories. Alternators play a critical role in maintaining a vehicle's electrical system and ensuring a reliable source of power for both the vehicle's operation and charging the battery.
What problems can be caused by this part?

Car electrics failing / no power

When turning on the ignition there's no power at all in the car, the dashboard isn't lighting up and the car won't turn over.

Battery does not hold charge

The battery does not hold charge for very long, even if it is charged up with a battery charger after a while of running the car the electrics fail again. It doesn't seem to be re-charging itself as the car is driving.

Engine doesn't start up and/or cuts out when running

The engine doesn't start up very easily and will often not start at all. When it is running it can cut out completely without warning.

Battery warning light shows on dashboard

A warning light that looks like the one pictured on this page has appeared on the dashboard and doesn't go out after the car has been running for a while.

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