Alternators turn mechanical energy from the engine's crankshaft into electricity through induction as the wires inside of the alternator cut through a magnetic field to induce electrical current. When it's time for a new 2010 Focus alternator, come to AutoZone. All of our 2010 Ford Focus alternators feature an output between 13.5 and 14.8 volts to power your accessories and keep your battery charged. Simply place your order and choose to pick up your purchase today at an AutoZone near you or get free shipping with next day delivery.