Bosch AL8787X Alternator

Bosch AL8787X Remanufactured Alternator

The Bosch AL8787X is a remanufactured 12-volt alternator built for charging-system service on select Chevrolet and GMC trucks and vans. It is specified for 105-amp applications and uses an internal regulator, internal fan, and clockwise rotation for direct-fit replacement where the original unit matches these specifications.

Key Features

• Remanufactured Bosch alternator for charging-system replacement
• 12-volt, 105-amp output
• Internal regulator and internal fan design
• Clockwise rotation
• Includes pulley; 6-groove pulley configuration
• Aluminum case and aluminum case material
• External fan included
• External regulator included
• Plug type 346 with rear-view plug clocking at 8 o’clock

Product Details

Bosch Premium Alternators are remanufactured, built, and tested to deliver consistent charging performance and dependable operation. The AL8787X is engineered for vehicles that require a 12V alternator with a 105-amp rating, internal regulation, and a 6-groove belt drive. This part number, AL8787X, is listed for a range of Chevrolet Express, Silverado, Avalanche, Suburban, and GMC Savana, Sierra, and Yukon XL applications, including several 2005-2007 Chevrolet Silverado 2500 HD and 2007 Silverado/Sierra Classic configurations with specific alternator and connector requirements.

This part cross-references 21998419 for the same application.

Common Charging Problems It Can Address

• Battery warning light caused by alternator output loss
• Dim headlights or unstable electrical performance
• Battery not maintaining charge during normal driving
• Charging-system noise or inconsistent voltage output
• Alternator failure on Chevrolet Express, Silverado, and GMC Sierra/Savana platforms

Installation Notes

Verify the original alternator’s amperage rating, plug type, pulley style, and mounting-ear clocking before installation. This AL8787X is listed for specific Chevrolet Express 1500, Express 2500, Express 3500, Silverado 1500 Classic, Silverado 2500 HD Classic, Silverado 3500 Classic, GMC Savana 1500, Savana 2500, Sierra 1500 Classic, Sierra 1500 HD Classic, Sierra 2500 HD Classic, Sierra 3500 Classic, Avalanche 2500, Suburban 1500, Suburban 2500, Yukon XL 2500, and related 2003-2007 applications. Confirm whether the vehicle uses a standard or dual-alternator setup and match any connector requirements noted in the fitment data.

Quality Assurance

Bosch remanufactured alternators are built and tested to meet charging-system service requirements for reliable electrical output. The AL8787X is a Bosch Premium Alternator remanufactured unit designed for direct replacement in the listed Chevrolet and GMC applications.