OEX Alternator 12V 120A Bosch Style BXA4037

The OEX Alternator BXA4037 is a new 12V, 120A unit in Bosch style, supplied as an each item for rotating electrical applications. It is designed with a twin leg alternator mount, 57mm inside mounting legs, a 10mm pivot hole diameter, and an M8x1.25 adjusting hole diameter.

This alternator uses an internal regulator and a 5 groove pulley with a 54mm outside diameter. The note supplied for this unit states it will replace an original clutch style pulley unit, so pulley style and mounting details are important checks before ordering.

OEX identifies this part as suitable for Bosch unit applications and lists the pin code as IR189. The part number is BXA4037, and the unit weighs 6.64kg. For buyers replacing a Bosch style alternator, matching the mounting layout and electrical specification is a practical starting point.

Warranty cover is listed as 3yr Passenger and 1yr Commercial. OEX also states its products are sourced from market leading Original Equipment Manufacturers and aftermarket suppliers, with ISO9001 certified factories supporting engineering, testing, and quality control procedures.

Key Features

• 12V alternator with 120A output
• New unit, supplied each
• Bosch style, suits Bosch unit make
• Internal regulator
• Twin leg alternator mount
• 5 groove pulley, 54mm outside diameter

Specifications

• Voltage: 12V
• Power rating: 120A
• Regulator type: Internal
• Alternator mount: Twin leg
• Inside mounting legs: 57mm
• Pivot hole diameter: 10mm
• Adjusting hole diameter: M8x1.25
• Pulley section: 5 groove

Verified fitment guidance

• Suits Bosch unit make
• Fitment data supplied for Holden, Mercedes-Benz, Saab, and Volkswagen applications
• Sample application groups include Holden Astra, Holden Barina, Holden Calibra, Holden Combo, Holden Frontera, Holden Tigra, Holden Vectra, Mercedes-Benz Sprinter 3, Saab 9-3, and Volkswagen Polo
• Application data also includes 5-T model years 2006 to 2009
• Because alternators are matched by mounting, pulley, regulator, and electrical specifications, confirm the part number BXA4037 against the vehicle application before ordering

Application and Buying Notes

Before buying, compare the part number BXA4037 with the existing alternator and check that the unit is Bosch style, 12V, and 120A. Those identifiers matter because alternators with the same plug or pulley appearance can still differ in mount layout, regulation, or output.

Mounting dimensions should be checked carefully. This unit has 57mm inside mounting legs, a 10mm pivot hole diameter, an M8x1.25 adjusting hole diameter, and a twin leg mount with 184mm centre-to-centre measurement. If the brackets on the vehicle do not match those figures, the alternator should not be assumed to fit.

Pulley details are also important. The listed pulley is a 5 groove design with a 54mm outside diameter, and the note says it will replace an original clutch style pulley unit. That makes pulley configuration a key compatibility checkpoint, especially where the removed alternator has a different pulley style.

If you are replacing a failed charging unit, compare the physical casing, mount spacing, and connector details before purchase, then confirm the vehicle application against the listed fitment group. The supplied fitment coverage includes Holden, Mercedes-Benz, Saab, and Volkswagen applications, but final confirmation should always be made against the vehicle and the existing part.

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 BXA4037 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, Inside Mounting Legs 57mm, Pivot Hole Diameter 10, Pulley Outside Diameter 54mm, Regulator Type Internal, Voltage 12, Alternator Mount Twin Leg, New / Reman. New.

Additional published details for cross-checking include Product Group 2 ALTERNATORS, Part No. BXA4037, Brand OEX, Description OEX Alternator 12V 120A Bosch Style, Adjusting Hole Diameter M8x1.25, Pin Code IR189, Power Rating (Amp) 120, Pulley Section 5 Groove, Suits Unit Make Bosch.

OEX Alternator 12V 120A Bosch Style. Part number BXA4037 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 Twin Leg. Regulator type is Internal. Pulley configuration is 5 Groove. Those physical and electrical details should line up with the original unit before the replacement is approved for fitment.

For part number BXA4037, 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.

For a alternator in workshop, fleet, trade, agricultural, or construction service, the listed voltage 12 and output 120 should be checked carefully. Incorrect selection can affect installation time, return freight, and equipment availability.

Available application references include 5-T 2006, 5-T 2007, 5-T 2008, 5-T 2009, HOLDEN ASTRA, HOLDEN ASTRA 1984. Even with application listings, final confirmation should still be based on the exact unit being replaced and the service requirements of the vehicle or machine.

The listed warranty is 3yr Passenger 1yr Commercial. Warranty terms should be considered alongside correct application and part identification, as warranty does not replace fitment confirmation.

Compatibility note: Confirm compatibility using part number BXA4037, the Bosch style application, and the measured mounting and pulley details before purchase. Do not rely on vehicle make alone when checking alternator fitment.

FAQ

What is the part number for this alternator?

The part number is BXA4037.

Is this alternator new or remanufactured?

It is listed as new.

What voltage and output does it have?

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

What type of regulator does it use?

It uses an internal regulator.

What pulley details are listed?

The pulley is listed as a 5 groove design with a 54mm outside diameter.

What warranty is supplied?

The warranty is listed as 3yr Passenger and 1yr Commercial.