OEX Alternator 12V 140A Mitsubishi Style MXA306

The OEX MXA306 is a new 12V alternator rated at 140A and described as Mitsubishi style. It is fitted with an internal regulator and a 6 groove pulley, making it important to compare the mounting layout, pulley setup and electrical requirements before ordering.

This unit is listed as a single leg alternator mount with a 50mm mount leg thickness, 10.5mm pivot hole diameter, 10.5mm adjusting hole diameter and 139mm mount centre to centre. The pulley outside diameter is 57.5mm, and the note advises a pin lug length of 51mm.

OEX states its products are sourced from market leading Original Equipment Manufacturers and aftermarket suppliers, with factories that are ISO9001 certified. The listed warranty is 3yr Passenger and 1yr Commercial, which gives a useful reference point when selecting a replacement alternator for the correct application.

Key Features

• New alternator, not remanufactured
• 12V output with 140A power rating
• Internal regulator fitted
• 6 groove pulley
• Single leg alternator mount
• Part number MXA306

Specifications

• Type: Alternator
• Voltage: 12V
• Power rating: 140A
• Regulator type: Internal
• Pulley section: 6 groove
• Pulley outside diameter: 57.5mm
• Mount leg thickness: 50mm
• Pivot hole diameter: 10.5mm

Verified fitment and application guidance

• Suits unit make: Mitsubishi
• Fitment information is provided for a range of Holden and HSV applications
• Do not rely on vehicle badge alone; confirm the alternator mount, pulley type and part number before ordering
• MXA306 will not interchange with MXA2020 or MXA332
• Adaptor to suit HXK-32 and HXK-24 is noted

Application and Buying Notes

When matching this alternator, the most important checks are the part number MXA306, the 12V 140A rating, and the mounting dimensions. The unit is a Mitsubishi style alternator with a single leg mount, 139mm mount centre to centre, 50mm mount leg thickness and 10.5mm pivot and adjusting holes, so those measurements should be compared against the removed unit or the vehicle’s confirmed application.

The pulley setup also needs close attention. This alternator has a 57.5mm pulley outside diameter and a 6 groove pulley section, so belt alignment and groove count must match the existing arrangement. If the vehicle uses a different regulator arrangement or pulley configuration, the alternator may not be a direct fit even if the electrical rating appears similar.

The note supplied with MXA306 is especially useful where similar alternators have been fitted previously. It states that MXA306 will not interchange with MXA2020 or MXA332, and that an adaptor suits HXK-32 and HXK-24. That means the safest approach is to verify the exact alternator code, mount style, pin code IR49 and pin lug length of 51mm before purchase.

If you are replacing a failed unit, check the original alternator for visible marks, connector style and the mounting ear spacing before committing. A new alternator can still be the wrong part if the mount leg shape, regulator type or pulley section differs from the vehicle’s existing setup. The listed 5.96kg weight can also help confirm you are comparing against a like-for-like unit.

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 MXA306 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 50mm, Pivot Hole Diameter 10.5, Pulley Outside Diameter 57.5mm, Regulator Type Internal, Voltage 12, Alternator Mount Single Leg, New / Reman. New.

Additional published details for cross-checking include Product Group 2 ALTERNATORS, Part No. MXA306, Brand OEX, Description OEX Alternator 12V 140A Mitsubishi Style, Adjusting Hole Diameter 10.5, Pin Code IR49, Power Rating (Amp) 140, Pulley Section 6 Groove, Suits Unit Make Mitsubishi.

OEX Alternator 12V 140A Mitsubishi Style. Part number MXA306 should be checked first. Listed voltage is 12. Listed output rating is 140. These details form the core reference points used by parts interpreters when confirming the correct replacement.

Mount style is Single Leg. Regulator type is Internal. Pulley configuration is 6 Groove. Those physical and electrical details should line up with the original unit before the replacement is approved for fitment.

For part number MXA306, 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 140 should be checked carefully. Incorrect selection can affect installation time, return freight, and equipment availability.

Compatibility note: Confirm fitment using the part number MXA306, the Mitsubishi style application, the 12V 140A rating, and the listed mount and pulley dimensions before ordering. Vehicle fitment should always be checked against the removed unit and application details.

FAQ

Is the OEX MXA306 alternator new or remanufactured?

It is listed as new, not remanufactured.

What is the voltage and output rating of this alternator?

The alternator is rated at 12V and 140A.

Does this alternator have an internal regulator?

Yes. The regulator type is listed as internal, and the note says the unit is fitted with a standard regulator.

What vehicles does it suit?

The fitment data states it suits Mitsubishi unit make, with fitment information also provided for a range of Holden and HSV applications. Exact compatibility should be confirmed against the part number and mounting details.

Will MXA306 interchange with MXA2020 or MXA332?

No. The note states that MXA306 will not interchange with MXA2020 or MXA332.

What mounting and pulley details should I check before ordering?

Check the single leg mount, 50mm mount leg thickness, 139mm mount centre to centre, 10.5mm pivot hole, 10.5mm adjusting hole, 6 groove pulley section and 57.5mm pulley outside diameter.