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According to our La Quinta Chevrolet service techs, the alternator is as important as the engine and the battery. Why? It's the automotive part that generates electricity, the power that keeps most of a car's electrical systems up and running while the car remains in motion.
Of Batteries and Alternators
The battery contains stored electricity. This electricity provides the first jump-start that turns the engine over. Thereafter, it's the alternator that continues to send electricity throughout the car, even keeping the car battery recharged for future use.