Bosch AL4309X Alternator

Bosch AL4309X Remanufactured Alternator

The Bosch AL4309X remanufactured alternator is built for 12-volt charging systems and is engineered for dependable electrical output in select Subaru applications. It is a direct-fit charging component for 2005-2009 Subaru Legacy and 2005-2009 Subaru Outback models.

Key Features

• Remanufactured Bosch alternator for 12V charging systems
• 110 amp amperage rating for stable electrical performance
• Internal fan and internal regulator design
• Clockwise rotation
• Includes pulley and external fan
• 5-groove pulley with 55 mm outside diameter
• Aluminum case and aluminum case color
• Plug type 319 with rear-view plug clock position at 6 o’clock

Product Details

Bosch Premium Alternators are remanufactured, built, and tested to deliver consistent performance and reliability in charging-system service. The AL4309X follows the original equipment style for select Subaru Legacy and Subaru Outback vehicles, with the correct plug configuration, pulley setup, and internal regulation needed for proper electrical system operation. This part number, AL4309X, is a practical replacement choice when restoring charging output on 2005-2009 Subaru Legacy and 2005-2009 Subaru Outback models.

This part cross-references Subaru 23700AA55A for the same application.

What This Alternator Helps Address

• Battery warning light caused by weak alternator output
• Low charging voltage during driving
• Electrical accessories that dim or operate inconsistently
• Hard starting related to insufficient battery recharge
• Charging-system failure on Subaru Legacy and Subaru Outback models

Installation Notes and Tips

Verify plug type 319, pulley style, and mounting-ear orientation before installation. Confirm the vehicle uses a 12-volt system and matches the listed fitment for 2005-2009 Subaru Legacy or 2005-2009 Subaru Outback. Inspect the drive belt, battery condition, and charging-system wiring during replacement to help ensure proper operation after installation. The AL4309X is a remanufactured alternator, so matching the vehicle’s original electrical and pulley specifications is important for correct fitment.

Quality Assurance

Bosch remanufactured alternators are built and tested to meet charging-system performance and reliability expectations for service replacement use.