Bosch AL3391X Alternator

Bosch Remanufactured Alternator AL3391X

Bosch AL3391X is a remanufactured 12-volt alternator built for steady charging performance and dependable electrical output. It is designed for Lexus applications that require a 150-amp unit with an internal regulator and internal fan.

The Bosch Premium Alternators line focuses on performance and reliability through controlled remanufacturing, testing, and specification matching. This AL3391X alternator includes the pulley and uses a 7-groove, 7S-DP belt drive layout with clockwise rotation.

Key Features

• 12-volt remanufactured alternator for charging-system service
• 150-amp amperage rating for Lexus electrical demand
• Internal regulator and internal fan design
• Clockwise rotation with 7-groove pulley included
• Aluminum case and aluminum case material for OE-style fitment
• Plug clock rear view main mounting ear at 6 o’clock
• Cross-reference: 2706031212

Detailed Description

This Bosch alternator, part number AL3391X, is built for select Lexus models including 2010-2017 Lexus IS350, 2010-2015 Lexus IS250, 2013-2015 Lexus GS350, 2015-2017 Lexus RC350, 2016-2017 Lexus IS300, 2016-2017 Lexus RC300, and 2018 Lexus IS300, IS350, RC300, and RC350 with the listed production cutoffs and 150-amp configurations. It is a remanufactured charging component intended to restore stable battery charging and support vehicle electrical loads in daily driving conditions.

For buyers searching for a Lexus IS350 alternator replacement, Lexus RC350 alternator, or Bosch AL3391X remanufactured alternator, this unit matches the specified voltage, pulley type, rotation direction, and mounting layout. Bosch Premium Alternators are remanufactured and tested to meet the demands of modern charging systems.

What It Helps Address

• Battery warning light caused by alternator output loss
• Low charging voltage during engine operation
• Dim lights or unstable electrical performance
• Charging-system noise related to worn alternator components
• Starting issues tied to insufficient battery recharge

Installation Notes and Tips

Verify the vehicle’s alternator amperage, pulley groove count, plug clock position, and production cutoff before installation. This AL3391X uses an internal regulator, clockwise rotation, and a 7-groove pulley, so matching the original unit’s specifications is important for proper fitment on Lexus IS250, IS300, IS350, GS350, RC300, and RC350 applications.

Inspect the belt condition, electrical connectors, and charging-system wiring during replacement. Confirm that the mounting ear orientation and pulley type align with the original alternator before final installation.

Quality Assurance

Bosch remanufactured alternators are built, tested, and specified for reliable charging-system performance. The AL3391X is produced as a remanufactured replacement part for the listed Lexus applications and follows Bosch Premium Alternators product-line standards for fit and function.