Bosch 100% New Alternators benefit from more than 100 years of alternator manufacturing experience, ensuring years of reliable charging performance, even under the most extreme operating conditions imaginable, from the sub zero temps of the northern plains to the blazing southwest desert heat. All Bosch 100% New Alternators are engineered, manufactured, and 100% tested to the highest industry standards Bosch is famous for, using all new, not remanufactured, components for superior reliability and performance. Bosch 100% New Alternators incorporate only original equipment quality components to withstand the rigors of high heat environments and high electrical demand. Bosch 100% New Alternators are identical in fit and function to the OE parts they replace, yet benefit from the latest enhancements in engineering and charging technology for superior performance. All Bosch 100% New Alternators are ready for installation right out of the box. NOTE: Always ensure battery is fully charged before installing a new alternator. Alternators are engineered to keep batteries topped off, not to fully charge a dead battery. Using a new alternator to charge a dead battery can damage internal components, shortening the life of the alternator.