Posted on 8/29/2025
Most drivers think of the battery as the heart of the electrical system, but in reality, it’s the alternator that keeps things running. The alternator’s job is to generate electricity while the engine is running, supplying power to lights, climate control systems, entertainment systems, and other electrical components. At the same time, it recharges the battery so it’s ready to start your car the next time you turn the key. Without a properly functioning alternator, even a brand-new battery will quickly lose charge and leave you stranded. How the Alternator Works The alternator converts mechanical energy from the engine into electrical energy. It uses a belt connected to the crankshaft to spin an internal rotor, which generates alternating current (AC). A built-in rectifier then converts the AC into direct current (DC), which the car’s systems can use. This flow of electricity is what recharges the battery and powers every electrical component ... read more