Jump Start (vehicle)

Jump Start (vehicle)

A jump start, also called a boost, is a method of starting an automobile or other vehicle powered by an internal combustion engine when the vehicle's battery has been discharged. A second battery (often in another vehicle) is temporarily connected to provide starting power to the disabled vehicle. Once the disabled vehicle's engine is running, its alternator or generator should recharge the dead battery, so the second battery can be disconnected.

Most motor vehicles use a battery that provides power to a starting electric motor for the engine. When the engine is running, electrical power from its alternator restores the charge to the battery in preparation for the next start. When a battery is discharged, as for example by headlights left on while the engine is off, the car's engine will not "turn over" when the ignition key is turned and the vehicle will not start.