OEX Alternator 12V 120A Bosch Style BXA4039

The OEX Alternator 12V 120A Bosch Style, part number BXA4039, is a new pad-mount alternator with an internal regulator and a 5 groove pulley. It is rated at 120 amps at 12 volts, with a unit weight of 7.1kg.

This alternator is listed as suiting Bosch applications and is fitted with a clutch style pulley. Key mounting details include 56mm inside mounting legs, 79mm mount leg thickness, 163mm mount centres B, and 172mm mount centre to centre.

OEX products are sourced from market leading original equipment manufacturers and aftermarket suppliers, and the brand notes ISO9001 certified factory sourcing. For buyers comparing replacements, the important checkpoints here are the Bosch style application, BXA4039 part number, 120A output, and the mounting and pulley measurements.

Warranty cover is listed as 3 years for passenger use and 1 year for commercial use. That makes it important to match the physical dimensions and application details before ordering, especially where the alternator mounting and pulley arrangement need to align with the vehicle setup.

Key Features

• New alternator, not remanufactured
• 12V, 120A output
• Internal regulator
• Pad mount design
• 5 groove pulley
• Clutch style pulley fitted

Specifications

• Brand: OEX
• Product type: Alternator
• Part No.: BXA4039
• Power rating: 120A
• Voltage: 12V
• Regulator type: Internal
• Mount type: Pad
• New / Reman.: New

Fitment guidance

• Suits Bosch applications
• Fitment data supplied for SAAB 9-3 across multiple model years, including 1998 through 2008

Application and Buying Notes

Before ordering, confirm the alternator on the vehicle matches the Bosch style application, because this unit is identified as suit unit make Bosch and carries part number BXA4039. The mounting layout matters as much as the electrical rating, so check the pad mount design, 56mm inside mounting legs, 79mm mount leg thickness, 163mm mount centres B, and 172mm mount centre to centre against the existing unit.

The pulley setup also needs attention. This alternator has a 57mm outside diameter pulley, a 5 groove pulley section, and it is noted as fitted with a clutch style pulley. If the belt arrangement or pulley style on the vehicle differs, the replacement may not be suitable even if the alternator output is otherwise close.

Electrical output is rated at 120A and 12V, so this unit is intended for vehicles that require that charging specification. If the original alternator is a different amperage rating, do not assume interchangeability based on the brand alone. The internal regulator is another useful matching point, particularly where the existing charging system is built around that design.

For buyers replacing an alternator on a SAAB 9-3 or another Bosch application, the safest approach is to match the part number, the mounting dimensions, and the pulley details together. The supplied fitment reference includes SAAB 9-3 applications across 1998 to 2008, but the final check should always be against the vehicle’s existing alternator and charging system configuration.

This is a new unit and the listed warranty is 3 years for passenger use and 1 year for commercial use. Warranty cover does not replace the need to verify fitment, especially on electrical parts where pulley type, mounting leg spacing, and regulator type must line up with the existing setup.

If you are comparing alternatives, use the physical measurements and part number as the main reference points. A Bosch style alternator can still vary in mount position, pulley form, or electrical setup, so matching the listed 120A, 12V, internal regulator, and BXA4039 identifier is the practical way to reduce the chance of a mismatch.

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 BXA4039 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 56mm, Mount Leg Thickness 79mm, Pivot Hole Diameter 9 / 10, Pulley Outside Diameter 57mm, Regulator Type Internal, Voltage 12, Alternator Mount Pad.

Additional published details for cross-checking include New / Reman. New, Product Group 2 ALTERNATORS, Part No. BXA4039, Brand OEX, Description OEX Alternator 12V 120A Bosch Style, Adjusting Hole Diameter 9 / 10, Mount Centres B 163mm, Pin Code IR120, Power Rating (Amp) 120.

OEX Alternator 12V 120A Bosch Style. Part number BXA4039 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 5 Groove. Those physical and electrical details should line up with the original unit before the replacement is approved for fitment.

For part number BXA4039, 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 the part number BXA4039, the Bosch style application, and the listed mounting and pulley measurements before purchase. Where vehicle fitment is being checked against SAAB 9-3 applications, compare the existing alternator carefully rather than relying on model name alone.

FAQ

What is the part number for this alternator?

The part number is BXA4039.

What are the voltage and amperage ratings?

It is rated at 12V and 120A.

Does this alternator use an internal regulator?

Yes. The regulator type is internal.

What pulley setup does it have?

It has a 5 groove pulley, a 57mm pulley outside diameter, and it is noted as fitted with a clutch style pulley.

What mounting details should I check?

Check the pad mount design, 56mm inside mounting legs, 79mm mount leg thickness, 9 / 10 pivot hole diameter, 9 / 10 adjusting hole diameter, 163mm mount centres B, and 172mm mount centre to centre.

What fitment information is supplied?

The supplied fitment reference includes Bosch applications and SAAB 9-3 applications across model years from 1998 to 2008.