Replace the weak factory alternator in your 2001-2004 Chevy/GMC 6.6L LB7 Duramax with a high-quality upgrade. Auxiliary equipment such as off-road lighting, winches, and snowplows can be extremely taxing on the factory charging system and is more than it was originally designed to support. In most applications, the alternators offered feature a direct-fit installation with no modifications required. They are engineered to mount in the factory location and re-use the stock belt and electrical connections. Upgraded high-output alternators are available that provide significantly more output than a stock unit and make sure your vehicle is up to the task. Shop today and get a new alternator for your vehicle. XDP offers many of the top alternators in the industry like Leece-Neville, Mean Green, XDP, and more!