MPA Electrical 10403 Alternator

Remanufactured Alternator for BMW Charging Systems

MPA Electrical 10403 is a remanufactured 12-volt alternator built for OE fit, form, and function. It is engineered for BMW charging system service where a direct replacement is needed for the original Bosch-family unit.

Compatible with select BMW 340i, 340i xDrive, 340i GT xDrive, 440i, 440i xDrive, M240i, and related models, this alternator uses an internal regulator, internal fan, clockwise rotation, and a serpentine pulley setup for straightforward OE-style replacement.

Key Features

• Remanufactured alternator for 12.0-volt charging systems
• OE-style replacement built around fit, form, and function
• Internal regulator and internal fan design
• Clockwise (right) rotation
• 6-groove serpentine pulley included
• Bosch family application
• Plug clock rear view main mounting ear at 6 o’clock: 8
• MPA Electrical 10403 alternator for BMW charging system repair

Product Details

This MPA Electrical remanufactured alternator is intended for BMW vehicles that use the Bosch-family charging system architecture. The unit includes the pulley and uses a decoupled or clutch pulley: no configuration, which helps match the original equipment layout on the listed applications. The MPA Electrical remanufactured line focuses on OE replacement coverage with remanufacturing and testing processes used to verify quality before installation.

This part cross-references BMW OE numbers 12 31 8 614 276 and 12 31 8 614 278 for the same application. If you are searching for an MPA Electrical 10403 alternator for BMW 340i or BMW M240i charging system service, this unit is built for those OE replacement needs.

Common Problems This Part Can Address

• Battery warning light or charging system fault message
• Low system voltage during driving or idle
• Dim lights or electrical accessories losing power
• Alternator bearing noise or charging output instability
• Failure of the original BMW alternator on Bosch-family applications

Installation Notes and Tips

• Verify the plug clock position, pulley type, and rotation direction before installation.
• Confirm belt alignment with the 6-groove serpentine pulley.
• Inspect the battery, belt, and charging circuit before replacing the alternator.
• Clear charging-related fault codes after installation and test system voltage.
• Use the vehicle’s exact year, model, and engine configuration to confirm application match.

Quality Assurance

MPA Electrical remanufactured alternators are produced to OE fit, form, and function standards and are tested using current remanufacturing and validation methods to support reliable replacement performance.

Fits 2016-2018 BMW 340i, N/A. Fits 2016-2018 BMW 340i xDrive, N/A. Fits 2017-2019 BMW 340i GT xDrive, N/A. Fits 2017-2020 BMW 440i, N/A. Fits 2017-2020 BMW 440i Gran Coupe, N/A. Fits 2017-2020 BMW 440i xDrive, N/A. Fits 2017-2020 BMW 440i xDrive Gran Coupe, N/A. Fits 2017-2021 BMW M240i, N/A. Fits 2017-2021 BMW M240i xDrive, N/A.