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To recharge the battery in cars with a piloted alternator, the ignition key must be turned off or disconnected, so as not to damage the current sensor, either with a battery charger or another vehicle transferring the charge. When it is necessary to transfer the charge from one vehicle to another using the cables, the vehicle receiving the charge must not start the engine while the cables are connected. It must wait 2 to 5 minutes to charge before starting. If you want to start the engine with the cables connected, the other vehicle must be turned off, so as not to damage components due to this voltage drop.