OEX Alternator 12V 120A Bosch Style BXA4030

The OEX Alternator BXA4030 is a new 12V unit with a 120A power rating, built in Bosch style and listed as suitable for Bosch applications. It uses an internal regulator, a pad mount alternator body, and a 7 groove pulley with a 56mm outside diameter.

This alternator is supplied as each and carries a 3 year passenger / 1 year commercial warranty. It is part of the OEX rotating electrical range, with OEX products sourced from ISO9001 certified factories to support controlled engineering, testing and quality procedures.

For installation checks, the key identifiers are 12V, 120A, BXA4030, IR121 pin code, 70mm mount leg thickness, 8 / 9 pivot hole diameter, and 8 / 10 adjusting hole diameter. Those measurements matter because alternators that look similar can differ in mounting and belt alignment.

Weight is listed at 7.06kg, which is useful when comparing against the removed unit and confirming you have the correct replacement before ordering. The Bosch style and pad mount configuration make it important to match the physical and electrical details, not just the external shape.

Key Features

• 12V alternator with 120A output
• New unit, not remanufactured
• Bosch style, suited to Bosch applications
• Internal regulator
• 7 groove pulley
• 56mm pulley outside diameter

Specifications

• Brand: OEX
• Product type: Alternator
• Part number: BXA4030
• Voltage: 12V
• Power rating: 120A
• New / remanufactured: New
• Regulator type: Internal
• Alternator mount: Pad

Fitment guidance

• Listed for Bosch applications
• Fitment data provided includes BMW, Mercedes-Benz and Peugeot applications
• BMW coverage in the supplied data includes BMW 3 series applications
• Mercedes-Benz coverage in the supplied data includes C-Class applications
• Peugeot coverage in the supplied data includes 306 and 307 applications
• A specific year list is not provided here for every model, so the part number and mounting measurements should still be checked against the removed unit

Application and Buying Notes

When comparing this alternator to the one in the vehicle, check the part number BXA4030 first, then confirm the 12V system, 120A output, and Bosch style mounting arrangement. The alternator is a pad mount design with 70mm mount leg thickness, 8 / 9 pivot hole diameter, and 8 / 10 adjusting hole diameter, so those dimensions need to line up with the existing bracket setup.

The 7 groove pulley with 56mm outside diameter is another important check because belt type and pulley size have to match the application. If the belt arrangement, pulley section, or mounting style differs from the unit being replaced, the alternator may not suit even if the vehicle brand is listed in the fitment data.

The supplied fitment data points to Bosch applications across BMW, Mercedes-Benz and Peugeot model families, including BMW 3 series, Mercedes-Benz C-Class, and Peugeot 306 and 307 entries. That said, model names alone are not enough for a proper match, so it is still best to compare the old unit, mounting points, plug configuration, and pin code IR121 before buying.

As a new unit from the OEX range, this alternator is backed by a 3 year passenger and 1 year commercial warranty. For commercial use, the shorter warranty period is worth noting, and for any replacement alternator the condition of the battery, charging cable, grounds, and belt system should also be checked so the new unit is not put under avoidable strain.

The listed weight of 7.06kg can help with identification when you are cross-checking part numbers or comparing against a removed alternator. Where the physical unit has been replaced previously, the safest approach is to match the old alternator’s mounting, plug style, pulley section, and electrical rating rather than relying on appearance alone.

Before supply, the safest approach is to confirm the original unit details against the listed part number, voltage, output rating, mounting arrangement, and pulley configuration. That checking process is standard practice in the parts trade because visually similar units can still differ in service-critical ways.

For workshop, fleet, and equipment applications, accurate identification of part number BXA4030 helps avoid unnecessary freight, additional labour, and vehicle or machine downtime. Where the application is not straightforward, the original unit, OEM reference, or workshop records should be used as the primary confirmation point.

Relevant published details for this unit include Type ALTERNATOR, Unit of Measure EACH, Warranty 3yr Passenger 1yr Commercial, Mount Leg Thickness 70mm, Pivot Hole Diameter 8 / 9, Pulley Outside Diameter 56mm, Regulator Type Internal, Voltage 12, New / Reman. New.

Additional published details for cross-checking include Product Group 2 ALTERNATORS, Part No. BXA4030, Brand OEX, Description OEX Alternator 12V 120A Bosch Style, Adjusting Hole Diameter 8 / 10, Pin Code IR121, Power Rating (Amp) 120, Pulley Section 7 Groove, Suits Unit Make Bosch, Alternator Mount Pad.

OEX Alternator 12V 120A Bosch Style. Part number BXA4030 should be checked first. Listed voltage is 12. Listed output rating is 120. These details form the core reference points used by parts interpreters when confirming the correct replacement.

Mount style is Pad. Regulator type is Internal. Pulley configuration is 7 Groove. Those physical and electrical details should line up with the original unit before the replacement is approved for fitment.

For part number BXA4030, the normal identification sequence is part number, electrical rating, mounting arrangement, connector or terminal style, and pulley or drive details. Using those checkpoints helps confirm that the listed unit matches the service requirement rather than only looking similar.

Compatibility note: Please confirm fitment using part number BXA4030, the Bosch style application details, and the matching mount and pulley measurements before ordering. Vehicle model references are only a guide and should be verified against the removed alternator and the vehicle’s charging system setup.

FAQ

Is this alternator new or remanufactured?

It is listed as new, not remanufactured.

What voltage and amperage does it have?

It is a 12V alternator with a 120A power rating.

What part number should I use to confirm the listing?

The part number is BXA4030.

What type of regulator does it use?

It uses an internal regulator.

What pulley details are listed?

The pulley is listed as 7 groove with a 56mm outside diameter.

What warranty is supplied?

The listed warranty is 3 years for passenger use and 1 year for commercial use.