Bosch AL4239X Alternator

Bosch Remanufactured Alternator AL4239X

Bosch AL4239X is a remanufactured 12-volt alternator built for charging-system replacement on select Mazda applications. It is configured with an internal fan, internal regulator, clockwise rotation, and a 6-groove pulley for direct-fit service on the listed vehicles.

Bosch Premium Alternators are remanufactured, tested, and built to deliver consistent electrical performance and dependable operation. For Mazda 6 and Mazda MX-5 Miata charging system service, AL4239X provides the key fitment and electrical specifications needed for a proper replacement.

Key Features

• 12-volt remanufactured alternator for charging-system repair
• Internal fan and internal regulator
• Clockwise rotation
• 6-groove pulley included
• Aluminum case and aluminum case material
• 55 mm outside pulley diameter
• External fan included
• External regulator included
• Plug type 341 with rear-view plug clocking at 6 o’clock
• Fits 2006-2013 Mazda 6 and 2006-2008 Mazda MX-5 Miata

Product Details

The Bosch AL4239X alternator is a remanufactured charging component designed around the listed OE-style electrical and mounting specifications. It uses a 12-volt design, 100-amp amperage rating, internal regulation, and a 6S pulley type to match the application requirements for Mazda 6 and Mazda MX-5 Miata models in the stated years. If you are searching for a remanufactured alternator for 2006-2013 Mazda 6 or a replacement alternator for 2006-2008 Mazda MX-5 Miata, AL4239X is built for those fitments. This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.

Common Charging Issues It Can Address

• Battery warning light caused by alternator output loss
• Low-voltage charging that leads to hard starts
• Dim lights or unstable electrical performance
• Charging-system failure after alternator wear
• Accessory and ignition issues tied to insufficient system voltage

Installation Notes

Verify the plug type, pulley configuration, rotation direction, and mounting-ear clocking before installation. Confirm the vehicle’s charging-system diagnosis and inspect the belt, connectors, and battery condition during replacement. Fits 2006-2013 Mazda 6, N/A. Fits 2006-2008 Mazda MX-5 Miata, N/A.

Quality Assurance

Bosch remanufactured alternators are built and tested to meet application-specific performance and reliability requirements. AL4239X is packaged in a box and supplied as a remanufactured Bosch charging-system component for the listed Mazda applications.