Bosch AL9377X Alternator

Bosch AL9377X Alternator Overview

The Bosch AL9377X is a remanufactured 12-volt alternator built for steady charging performance in Mercedes-Benz applications. It features an internal regulator, internal fan, clockwise rotation, and a 6-groove pulley to match the specified belt drive setup.

Designed for vehicles that require a 180-amp charging system, this Bosch Premium Alternator line focuses on consistent output and dependable operation. The AL9377X is a direct-fit replacement for select Mercedes-Benz G550, GL450, GL550, ML350, ML550, R350, R550, and SLK350 applications.

Key Features

• Remanufactured Bosch alternator for 12-volt charging systems
• 180-amp amperage rating for specified Mercedes-Benz applications
• Internal voltage regulator and internal fan design
• Clockwise rotation with included pulley
• 6-groove pulley, 51 mm outside pulley diameter
• Aluminum case and aluminum case material
• Fits Valeo-unit applications where specified
• Part number AL9377X for easy identification

Detailed Description

Bosch Premium Alternators are engineered, assembled, and tested to deliver reliable charging performance in demanding electrical systems. This remanufactured alternator is built around the specifications required for select Mercedes-Benz models, including 2014-2015 Mercedes-Benz G550, 2009-2012 GL450 and GL550, 2011 and 2010 ML350, 2009-2011 ML550, 2008-2011 R350, 2008 R550, and 2009-2011 SLK350 applications. The AL9377X also cross-references Bosch 0141540402 for the same application.

Use this alternator when the vehicle needs a 180-amp replacement with the correct pulley type, internal regulation, and clockwise rotation. The Bosch AL9377X supports the charging demands of Mercedes-Benz electrical systems while matching the listed fitment and configuration details.

What It Helps Solve

• Battery warning lights caused by weak charging output
• Low-voltage conditions from a failing alternator
• Dim lights or electrical instability during driving
• Charging system faults tied to worn internal components
• Replacement needs for a damaged or noisy alternator

Installation Notes and Tips

Verify the vehicle’s original alternator amperage, pulley style, rotation direction, and regulator type before installation. This part is specified for 12-volt systems with an internal regulator and a 6-groove belt drive, so matching the OE configuration is important for proper operation. Confirm fitment details for the exact Mercedes-Benz model, year, and any notes such as the Valeo unit or chassis/date restrictions listed in the application data.

Quality Assurance

Bosch Premium Alternators are designed, built, and tested to meet the performance and reliability expectations of the application. This remanufactured AL9377X alternator is produced to support consistent charging output in the specified Mercedes-Benz fitments.