OEX Alternator 12V 90A Mitsubishi Style MXA312

The OEX Alternator MXA312 is a new 12V, 90A rotating electrical unit designed in Mitsubishi style with a twin leg alternator mount. It suits Mitsubishi applications and listed Proton applications, so confirming the exact vehicle match against the part number and mount details is essential before ordering.

This alternator uses an internal regulator, a 5 groove pulley with a 65mm outside diameter, and an adjusting hole diameter of M8x1.25. The inside mounting legs measure 55mm, the pivot hole diameter is M10x1.25 / 10, and the mount centre to centre measurement is 175mm.

OEX identifies this unit as part number MXA312 and pin code IR49. It is supplied new, weighs 5.46kg, and is covered by a 3 year passenger / 1 year commercial warranty. Those details matter when you are comparing against an existing alternator or checking a catalogue listing for direct replacement.

Key Features

• New OEX alternator
• 12V, 90A output
• Internal regulator
• 5 groove pulley
• Twin leg alternator mount
• Part number MXA312

Specifications

• Voltage: 12V
• Power rating: 90A
• Type: Alternator
• Brand: OEX
• Part No.: MXA312
• Pin Code: IR49
• Regulator type: Internal
• Pulley section: 5 groove

Fitment guidance

• Mitsubishi
• Mitsubishi Challenger
• Mitsubishi Lancer
• Mitsubishi Magna
• Mitsubishi Pajero
• Mitsubishi Starwagon
• Mitsubishi Triton
• Mitsubishi Verada

Application and Buying Notes

Before buying, compare the MXA312 part number, the IR49 pin code, and the mounting measurements on your existing alternator. The critical checks here are the 12V system, 90A output, twin leg mount, 55mm inside mounting legs, 175mm centre-to-centre spacing, and the M10x1.25 / 10 pivot hole and M8x1.25 adjusting hole.

The pulley setup also needs to match the vehicle side of the install. This unit has a 5 groove pulley with a 65mm outside diameter, so it should be checked against the belt arrangement already on the vehicle rather than assumed from the vehicle make alone.

If you are replacing a worn alternator, use the old unit as a reference for the regulator type, pulley section, mount style, and hole sizes. Even within Mitsubishi and Proton applications, the correct alternator depends on the exact configuration fitted to the vehicle, not just the badge on the tailgate.

The unit is new and weighs 5.46kg, which can help when comparing physical size and handling against the part being removed. For commercial use, the warranty period is 1 year, while passenger use is covered for 3 years, so it is worth matching the purchase to the vehicle application and expected duty cycle.

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 MXA312 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 55mm, Pivot Hole Diameter M10x1.25 / 10, Pulley Outside Diameter 65mm, Regulator Type Internal, Voltage 12, Mount Cnt to Cnt 175mm, Weight 5.46kg.

Additional published details for cross-checking include Product Group 1 ROTATING ELECTRICAL, Part No. MXA312, Brand OEX, Description OEX Alternator 12V 90A Mitsubishi Style, Adjusting Hole Diameter M8x1.25, Pin Code IR49, Power Rating (Amp) 90, Pulley Section 5 Groove, Suits Unit Make Mitsubishi, Alternator Mount Twin Leg.

OEX Alternator 12V 90A Mitsubishi Style. Part number MXA312 should be checked first. Listed voltage is 12. Listed output rating is 90. 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 MXA312, 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 90 should be checked carefully. Incorrect selection can affect installation time, return freight, and equipment availability.

Compatibility note: Confirm fitment by matching the MXA312 part number, IR49 pin code, 12V 90A rating, twin leg mount, pulley details, and the vehicle application before purchase. Vehicle model names alone are not enough to confirm compatibility.

FAQ

What is the part number for this alternator?

The part number is MXA312. For this listing, part number MXA312 is the main reference point. Listed voltage is 12. Listed output rating is 90. Published fitment references include MITSUBISHI CHALLENGER, MITSUBISHI CHALLENGER 1997, MITSUBISHI CHALLENGER 1998. These details should still be checked against the original unit before ordering.

Is this alternator new or remanufactured?

It is listed as new. For this listing, part number MXA312 is the main reference point. Listed voltage is 12. Listed output rating is 90. Published fitment references include MITSUBISHI CHALLENGER, MITSUBISHI CHALLENGER 1997, MITSUBISHI CHALLENGER 1998. These details should still be checked against the original unit before ordering.

What voltage and output does it have?

It is a 12V alternator with a 90A power rating. For this listing, part number MXA312 is the main reference point. Listed voltage is 12. Listed output rating is 90. Published fitment references include MITSUBISHI CHALLENGER, MITSUBISHI CHALLENGER 1997, MITSUBISHI CHALLENGER 1998. These details should still be checked against the original unit before ordering.

What type of regulator does it use?

It uses an internal regulator. For this listing, part number MXA312 is the main reference point. Listed voltage is 12. Listed output rating is 90. Published fitment references include MITSUBISHI CHALLENGER, MITSUBISHI CHALLENGER 1997, MITSUBISHI CHALLENGER 1998. These details should still be checked against the original unit before ordering.

What pulley does it have?

It has a 5 groove pulley with a 65mm outside diameter. For this listing, part number MXA312 is the main reference point. Listed voltage is 12. Listed output rating is 90. Published fitment references include MITSUBISHI CHALLENGER, MITSUBISHI CHALLENGER 1997, MITSUBISHI CHALLENGER 1998. These details should still be checked against the original unit before ordering.

What should I check to confirm fitment?

Check the MXA312 part number, IR49 pin code, 12V 90A specification, twin leg mount, 55mm inside mounting legs, 175mm centre-to-centre measurement, and the vehicle application before ordering. For this listing, part number MXA312 is the main reference point. Listed voltage is 12. Listed output rating is 90. Published fitment references include MITSUBISHI CHALLENGER, MITSUBISHI CHALLENGER 1997, MITSUBISHI CHALLENGER 1998. These details should still be checked against the original unit before ordering.