BBB Industries 42030 Alternator

BBB Industries 42030 Reman Alternator

The BBB Industries REMAN ALTERNATOR 42030 is a 12-volt, 170-amp charging unit built for BMW applications that require a Nippondenso OE-style design. It features an internal voltage regulator, air cooling, and a clutch-style decoupled pulley for stable belt operation.

Key Features

• 170 amp amperage rating for BMW charging-system replacement
• 12V alternator with internal voltage regulator
• OE manufacturer reference: Nippondenso
• Clutch pulley included with 7-groove serpentine belt setup
• Clockwise rotation with negative polarity
• Internal fan and air-cooled design
• 12 o’clock plug clock position

Product Details

BBB Industries 42030 is a remanufactured alternator for select 2011-2012 BMW 135i, 335i, and 335i xDrive applications. It is specified for vehicles built to 03/2012 where noted, and it matches the OE-style electrical and pulley configuration used on these BMW charging systems. This part cross-references BMW 12-31-7-591-532 and 12-31-7-591-533 for the same application.

As part of the BBB Industries REMAN ALTERNATOR line, this unit is remanufactured to restore charging performance while maintaining the correct fitment, pulley type, and electrical output expected for the vehicle platform. The 42030 part number is also referenced as 104210-6052 in interchange data.

What It Helps Fix

• Battery warning light caused by alternator output loss
• Low charging voltage in 2011-2012 BMW 135i, 335i, or 335i xDrive
• Dim lights or electrical instability from weak charging performance
• Noise or belt issues related to a worn clutch pulley alternator
• Starting problems linked to insufficient alternator charging

Installation Notes and Tips

Verify the vehicle build date before ordering: 2012 BMW 135i, 335i, and 335i xDrive applications are listed only through 03/2012. Confirm the 7-groove serpentine pulley, clockwise rotation, 12 o’clock plug position, and negative polarity match the original unit before installation. Fits 2011 BMW 135i, N/A; Fits 2011 BMW 335i, N/A; Fits 2011 BMW 335i xDrive, N/A; Fits 2012 BMW 135i, N/A; Fits 2012 BMW 335i, N/A; Fits 2012 BMW 335i xDrive, N/A.

Quality Assurance

This remanufactured alternator is built to OE-style specifications for the listed BMW applications, including the correct amperage rating, pulley type, and regulator configuration. It is intended to replace the original charging unit with a direct-fit electrical and mechanical match for the confirmed vehicles.