The main purpose of a jump start is to provide a temporary boost of electrical power from an external source, such as another vehicle's battery or a portable jump starter, to start a car with a dead or discharged battery. When a car battery is too weak to provide the necessary voltage to start the engine, a jump start helps bridge the gap by transferring power through jumper cables to the dead battery, enabling the starter motor to crank the engine. Once the engine starts, the vehicle's alternator takes over, recharging the battery and supplying power to the car's electrical systems. A jump start is a quick and effective way to restart a vehicle without replacing the battery immediately, especially in emergencies.

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