Bosch AL3388X Alternator

Bosch Remanufactured Alternator for Toyota, Subaru, and Scion

Bosch AL3388X is a remanufactured 12-volt alternator built for dependable charging performance in select Toyota, Subaru, and Scion applications. It features a 130-amp output, internal regulator, internal fan, and a clockwise rotation design with a 6-groove pulley already included.

Bosch Premium Alternators are remanufactured, assembled, and tested to deliver consistent electrical output and reliable operation. The AL3388X is a direct-fit charging component for drivers looking for an OE-style replacement for the Toyota 86, Subaru BRZ, and Scion FR-S.

Key Features

• 12-volt remanufactured alternator
• 130-amp amperage rating for charging system support
• Internal voltage regulator
• Internal fan design
• Clockwise rotation
• 6-groove pulley included
• Aluminum case and aluminum case material
• Plug clock rear view main mounting ear at 6 o’clock, 11
• One-wire capable: No

Detailed Product Overview

The Bosch AL3388X alternator is engineered for vehicles that require stable battery charging and consistent electrical performance under normal driving conditions. Its remanufactured construction follows Bosch’s premium alternator standards, with testing performed to verify operation before installation. The 58.8 mm outside pulley diameter and 6S pulley/belt type support proper belt engagement in the specified applications. This part cross-references Toyota and Subaru OE numbers 23700AA751 and SU00300484 for the same application.

Compatible With 2017-2019 Toyota 86, N/A; 2013-2016 Scion FR-S, N/A; and 2013-2016 Subaru BRZ, N/A. If you are replacing a failing charging unit on a Toyota 86, Subaru BRZ, or Scion FR-S, Bosch AL3388X provides the correct fitment and electrical specification for these vehicles.

Common Problems This Part Can Help Solve

• Battery warning light caused by alternator output loss
• Dim headlights or unstable electrical performance
• Battery not maintaining charge during normal driving
• Charging system noise related to alternator wear
• Vehicle starting issues tied to insufficient charging voltage

Installation Notes and Tips

Verify pulley style, connector orientation, and mounting ear clocking before installation. Confirm belt alignment and inspect the drive belt, tensioner, and charging cables during replacement to help ensure proper system operation. This alternator is not one-wire capable and uses an internal regulator, so the vehicle’s charging system configuration should match the listed specifications.

Quality Assurance

Bosch remanufactured alternators are built and tested to meet Bosch’s performance and reliability standards for charging-system replacement parts. For buyers seeking a dependable alternator for the Toyota 86, Subaru BRZ, or Scion FR-S, the AL3388X offers a specification-matched replacement backed by Bosch’s remanufacturing process.