OEX Alternator 12V 70A Denso Style DXA539

The OEX DXA539 is a new 12V alternator rated at 70A and built in a Denso style configuration. It suits Denso units and uses a single leg mount, with a 160mm mount centre-to-centre measurement and a 58mm mount leg thickness for application matching.

This alternator has an internal regulator and a 3 pin round regulator plug. If your vehicle or existing unit uses an oval 3 pin plug, OEX specifies DXA400 instead, so connector style needs to be checked before ordering.

Other useful identifiers for matching include pulley outside diameter of 54mm, 5 groove pulley section, pivot hole diameter of 10, adjusting hole diameter of M8x1.25, and pin code IR7. The unit weighs 4.4kg and is sold as each.

Key Features

• New alternator, not remanufactured
• 12V, 70A output
• Internal regulator
• 3 pin round regulator plug
• Single leg alternator mount
• 5 groove pulley section

Specifications

• Part number: DXA539
• Brand: OEX
• Product type: Alternator
• Voltage: 12V
• Power rating: 70A
• Suits unit make: Denso
• Pulley outside diameter: 54mm
• Pulley section: 5 groove

Fitment guidance

• Fitment data is not being listed here because the supplied application information is broad and should be checked against the exact vehicle and unit details.
• The alternator is intended for Denso style applications.
• Connector style must be confirmed as a 3 pin round regulator plug.
• If the vehicle uses an oval 3 pin plug, OEX specifies DXA400 instead.

Application and Buying Notes

Before buying, match the part number DXA539 and confirm the alternator on the vehicle is a Denso style unit with a single leg mount. The mount centre-to-centre measurement is 160mm, the mount leg thickness is 58mm, and the pivot hole diameter is 10, so these dimensions should line up with the existing unit or the engine bracket arrangement.

Electrical connection is just as important as the physical mounting points. This alternator uses an internal regulator and a 3 pin round regulator plug, while the note specifically directs oval 3 pin plug applications to DXA400. That difference matters even where the unit looks similar at a glance.

The 12V, 70A rating is suited to applications designed for that output level. It is not sensible to assume a higher or lower rated alternator will be interchangeable without checking the original specification, pulley setup, and connector layout. The 54mm pulley outside diameter and 5 groove pulley section are practical confirmation points when comparing against the removed unit.

If you are replacing a worn alternator, compare the old unit carefully before fitting. Check the mounting ear style, hole sizes, pulley section, and regulator plug shape, then confirm the unit make and part number where available. These checks help avoid ordering the wrong unit, especially where similar Denso style alternators appear across different Toyota and Lexus applications.

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 DXA539 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 54mm, 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. DXA539, Brand OEX, Description OEX Alternator 12V 70A Denso Style - See note, Adjusting Hole Diameter M8x1.25, Pin Code IR7, Power Rating (Amp) 70, Pulley Section 5 Groove, Suits Unit Make Denso.

OEX Alternator 12V 70A Denso Style - See note. Part number DXA539 should be checked first. Listed voltage is 12. Listed output rating is 70. 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 5 Groove. Those physical and electrical details should line up with the original unit before the replacement is approved for fitment.

For part number DXA539, 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 70 should be checked carefully. Incorrect selection can affect installation time, return freight, and equipment availability.

Available application references include LEXUS ES, LEXUS ES 1991, LEXUS ES 1992, LEXUS ES 1993, TOYOTA ALTEZZA, TOYOTA ALTEZZA 1999. 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 fitment by comparing the part number DXA539, Denso style application details, single leg mounting dimensions, and the regulator plug style before purchase. If your existing unit has an oval 3 pin plug, OEX advises using DXA400 instead.

FAQ

Is this alternator new or remanufactured?

It is listed as new, not remanufactured.

What voltage and output does it have?

It is a 12V alternator rated at 70A.

What regulator plug does it use?

It uses a 3 pin round regulator plug and an internal regulator.

What should I use if my vehicle has an oval 3 pin plug?

OEX specifies DXA400 for oval 3 pin plug applications.

What are the key mounting dimensions?

The listed mounting details are single leg mount, 160mm mount centre-to-centre, 58mm mount leg thickness, and 10mm pivot hole diameter.

What warranty is listed?

The warranty is listed as 3 year passenger and 1 year commercial.