If you have a newer or higher-end vehicle, a new alternator may be the best choice for optimal performance and reliability. On the other hand, if you have an older or less expensive vehicle, a remanufactured alternator may be a more cost-effective choice.

The lifespan of a rebuilt alternator can vary widely depending on the quality of the remanufacturing process. A well-done refurbishment can result in an alternator that performs similarly to a new one, often lasting between 60,000 and 100,000 miles.

Most reconditioned alternators come with at least a one-year warranty, while some come with a warranty for up to three years. Some new alternators may carry a limited lifetime warranty. Check with your mechanic to learn how long the warranty is and what it covers.