Bosch AL0900N Alternator
OE Quality 60-Day Returns
Bosch
 Alternator (New)

Bosch AL0900N Alternator

Brand Bosch AL0900N
Voltage 12
Plug Clock Rear View Main Mounting Ear at 6 O Clock 12
Fan Type Internal
Rotation Direction Clockwise
Pulley Included Yes
Pulley Groove Quantity 5
Case Color Aluminum
Outside Pulley Diameter 52
Regulator Type Internal
Case Material Aluminum
Amperage Rating 150
New Or Remanufactured New
Original Equipment Manufacturer Names Bo
Product Length 7.480315 in
Pulley Type / Belt Type (Alternator) 5s-cp
Product line Alternator (New)
Fits Mercedes-Benz · 18 vehicles

OE-style new alternator. Built for dependable charging performance and reliability.

Internal regulator. Helps maintain steady voltage output.

Aluminum case. Lightweight construction with a pulley included.

Cross-references 0009061903 for the same application. See all 1.

$494.21Free shipping
In stock · usually ships same day before 1pm CST
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Free returns within 60 days if it doesn't fit when fitment is verified.
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Bosch AL0900N Alternator Overview

The Bosch AL0900N is a new 12-volt alternator built for steady charging performance and dependable electrical output. It is a direct replacement for select Mercedes-Benz applications, including the GLA250, CLA250, and B250, with fitment covering 2013-2020 model years.

Bosch Premium Alternators are engineered, assembled, and tested for consistent operation and reliability in daily driving conditions. This AL0900N alternator includes an internal regulator, internal fan, and pulley, with a 150-amp rating for vehicles that need stable charging support.

Key Features

  • New Bosch alternator, part number AL0900N
  • 12-volt charging system component with 150-amp output
  • Internal regulator for integrated voltage control
  • Internal fan design for alternator cooling
  • Clockwise rotation
  • 5-groove pulley included, 52 mm outside pulley diameter
  • Aluminum case and aluminum case color
  • OE reference: Bosch original equipment manufacturer name BO

Detailed Product Description

The Bosch AL0900N alternator is built for Mercedes-Benz charging system service where a direct-fit replacement is needed. It is listed for 2015-2020 Mercedes-Benz GLA250, 2014-2019 Mercedes-Benz CLA250, and 2013-2018 Mercedes-Benz B250 German-built vehicles. If you are searching for a Mercedes-Benz GLA250 alternator, Mercedes-Benz CLA250 alternator, or Mercedes-Benz B250 alternator, this Bosch unit provides the specified electrical and mounting configuration for those applications.

This alternator uses an internal regulator and internal fan, with clockwise rotation and a 5S-CP pulley type. The aluminum housing helps keep the unit lightweight while maintaining the structure needed for charging system service. Part number AL0900N also cross-references 0009061903 for the same application.

Common Problems This Part Can Address

  • Battery warning light caused by weak alternator output
  • Low charging voltage during driving or idle
  • Electrical accessories losing power under load
  • Battery discharge after repeated short trips
  • Charging system noise or inconsistent voltage regulation

Installation Notes and Tips

Verify pulley groove count, rotation direction, voltage rating, and mounting layout before installation. Confirm the vehicle uses the listed Mercedes-Benz application and compare the original unit to Bosch AL0900N, especially the plug orientation and rear mounting ear position. After installation, inspect belt condition and charging voltage to confirm proper system operation.

Quality Assurance

Bosch Premium Alternators are manufactured and tested to meet the demands of OE-style charging system replacement. The AL0900N is a new alternator built for consistent performance in the specified Mercedes-Benz GLA250, CLA250, and B250 applications.

Related reading

This part fits 18 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelLitersCylindersPositionNotes
2020Mercedes-BenzGLA2502.0LL4N/AAlternator (New)
2019Mercedes-BenzCLA2502.0LL4N/AAlternator (New)
2019Mercedes-BenzGLA2502.0LL4N/AAlternator (New)
2018Mercedes-BenzB2502.0LL4N/AGerman Built Vehicle; Alternator (New)
2018Mercedes-BenzCLA2502.0LL4N/AAlternator (New)
2018Mercedes-BenzGLA2502.0LL4N/AAlternator (New)
2017Mercedes-BenzB2502.0LL4N/AGerman Built Vehicle; Alternator (New)
2017Mercedes-BenzCLA2502.0LL4N/AAlternator (New)
2017Mercedes-BenzGLA2502.0LL4N/AAlternator (New)
2016Mercedes-BenzB2502.0LL4N/AGerman Built Vehicle; Alternator (New)
2016Mercedes-BenzCLA2502.0LL4N/AAlternator (New)
2016Mercedes-BenzGLA2502.0LL4N/AAlternator (New)
2015Mercedes-BenzB2502.0LL4N/AGerman Built Vehicle; Alternator (New)
2015Mercedes-BenzCLA2502.0LL4N/AAlternator (New)
2015Mercedes-BenzGLA2502.0LL4N/AAlternator (New)
2014Mercedes-BenzB2502.0LL4N/AGerman Built Vehicle; Alternator (New)
2014Mercedes-BenzCLA2502.0LL4N/AAlternator (New)
2013Mercedes-BenzB2502.0LL4N/AGerman Built Vehicle; Alternator (New)
Directly replaces or cross-references 1 part number
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.
0009061903