If the battery is dead will alternator charge it?

Yes, the alternator will charge a dead battery. The alternator is a device that converts mechanical energy from the engine into electrical energy. This electrical energy is then used to power the vehicle's electrical system and recharge the battery. When the battery is dead, the alternator will continue to generate electricity, but the battery will not be able to store it. However, once the battery has been recharged, the alternator will be able to maintain the battery's charge.