OEX Alternator 12V 90A Denso Style DXA4003

The OEX DXA4003 alternator is a new 12V, 90 amp unit built in a Denso style and supplied as each. It suits Denso applications and uses an internal regulator, which is an important check when matching the replacement to the vehicle’s charging system.

Key physical details on this alternator include a single leg mount, 58mm mount leg thickness, 164mm mount centre-to-centre, and a 10mm pivot hole diameter. It also has an M8 x 1.25 adjusting hole, a 58mm outside diameter pulley, and a 6 groove pulley section.

The unit weighs 5.2kg and is identified as part number DXA4003. It has a 3 pin oval regulator plug, and if your application uses a round 3 pin plug, OEX notes that DXA539 is the alternative to use. Checking the plug style before purchase is essential on this type of alternator.

Key Features

• New alternator, not remanufactured
• 12V output with 90 amp power rating
• Internal regulator
• Single leg alternator mount
• 3 pin oval regulator plug
• For round 3 pin plug use DXA539

Specifications

• Brand: OEX
• Part number: DXA4003
• Type: Alternator
• Voltage: 12V
• Power rating: 90 amp
• Suits unit make: Denso
• Regulator type: Internal
• Alternator mount: Single leg

Verified fitment references

• Holden Frontera applications listed
• Holden Jackaroo / Monterey applications listed
• Holden Rodeo applications listed
• Isuzu MU applications listed
• Isuzu Wizard applications listed
• John Deere Series 7000 applications listed
• John Deere Series 7010 applications listed

Application and Buying Notes

Before ordering, confirm the replacement matches part number DXA4003 and that the vehicle uses a Denso style alternator with a 12V, 90 amp specification. The unit is a single leg mount design with a 58mm mount leg thickness and 164mm mount centre-to-centre, so bracket alignment should be checked against the existing alternator.

The plug style is one of the main points to verify. This alternator has a 3 pin oval regulator plug, and OEX specifies DXA539 for applications that use a round 3 pin plug. That makes the regulator connector just as important as the electrical output when comparing the old unit to the new one.

Pulley and mounting dimensions also need attention. The pulley is 58mm outside diameter with a 6 groove section, and the pivot hole measures 10mm while the adjusting hole is M8 x 1.25. These measurements help confirm the alternator will physically install in the same position and line up correctly with the belt drive.

This alternator is supplied new and carries a 3 year passenger and 1 year commercial warranty. Warranty cover is useful, but it does not replace fitment checking, especially where the application lists multiple vehicle families and years. Match the unit make, mounting style, and plug type before fitting.

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 DXA4003 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 58mm, Pivot Hole Diameter 10, Pulley Outside Diameter 58mm, 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. DXA4003, Brand OEX, Description OEX Alternator 12V 90A Denso Style, Adjusting Hole Diameter M8 x 1.25, Pin Code IR75, Power Rating (Amp) 90, Pulley Section 6 Groove, Suits Unit Make Denso.

OEX Alternator 12V 90A Denso Style. Part number DXA4003 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 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 DXA4003, 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 comparing part number DXA4003, the Denso style application, the 12V 90A rating, and the 3 pin oval regulator plug against your existing alternator before purchase. If your vehicle uses a round 3 pin plug, check DXA539 instead.

FAQ

What is the part number for this alternator?

The part number is DXA4003. For this listing, part number DXA4003 is the main reference point. Listed voltage is 12. Listed output rating is 90. Published fitment references include HOLDEN FRONTERA, HOLDEN FRONTERA 1999, HOLDEN FRONTERA 2000. 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 90 amp power rating. For this listing, part number DXA4003 is the main reference point. Listed voltage is 12. Listed output rating is 90. Published fitment references include HOLDEN FRONTERA, HOLDEN FRONTERA 1999, HOLDEN FRONTERA 2000. 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 DXA4003 is the main reference point. Listed voltage is 12. Listed output rating is 90. Published fitment references include HOLDEN FRONTERA, HOLDEN FRONTERA 1999, HOLDEN FRONTERA 2000. These details should still be checked against the original unit before ordering.

What plug does this alternator have?

It has a 3 pin oval regulator plug. For this listing, part number DXA4003 is the main reference point. Listed voltage is 12. Listed output rating is 90. Published fitment references include HOLDEN FRONTERA, HOLDEN FRONTERA 1999, HOLDEN FRONTERA 2000. These details should still be checked against the original unit before ordering.

What should I use if my vehicle has a round 3 pin plug?

OEX notes that DXA539 should be used for a round 3 pin plug application. For this listing, part number DXA4003 is the main reference point. Listed voltage is 12. Listed output rating is 90. Published fitment references include HOLDEN FRONTERA, HOLDEN FRONTERA 1999, HOLDEN FRONTERA 2000. These details should still be checked against the original unit before ordering.

Is this alternator new or remanufactured?

It is new. For this listing, part number DXA4003 is the main reference point. Listed voltage is 12. Listed output rating is 90. Published fitment references include HOLDEN FRONTERA, HOLDEN FRONTERA 1999, HOLDEN FRONTERA 2000. These details should still be checked against the original unit before ordering.