OEX Alternator 12V 90A Hitachi Style HXA104

The OEX Alternator HXA104 is a new 12V, 90 amp alternator built in a Hitachi style configuration for vehicles that match the listed mounting and electrical details. It uses an internal regulator, a 7 groove pulley, and a twin leg alternator mount, so the physical layout needs to suit the original unit before purchase.

Key dimensions include 81mm inside mounting legs, 161mm mount centre to centre, a 10mm pivot hole diameter, and an M8x1.25 adjusting hole. The pulley outside diameter is 65mm, and the unit weighs 5.24kg. Those measurements matter because alternators that are close in appearance can still differ in bracket spacing, pulley section, or mounting hole sizes.

OEX positions this alternator as part of its rotating electrical range, and the listed warranty is 3 years for passenger use and 1 year for commercial use. The part number is HXA104, the brand is OEX, and the unit is identified as suitable for Hitachi applications where the same mounting and electrical specification is required.

Key Features

• New alternator, not remanufactured
• 12V, 90 amp output
• Internal regulator
• 7 groove pulley
• Twin leg alternator mount
• Hitachi style application

Specifications

• Type: Alternator
• Brand: OEX
• Part No.: HXA104
• Voltage: 12V
• Power rating: 90A
• New / Reman.: New
• Regulator type: Internal
• Alternator mount: Twin leg

Fitment guidance

• Listed fitment families include Holden Colorado, Holden Rodeo, and Isuzu D-Max.
• Sample applications shown include Holden Colorado 2008, 2009, 2010, 2011, 2012 and Holden Rodeo 2007, 2008, plus Isuzu D-Max 2007, 2008, 2009, 2010, 2011, 2012.
• Use the part number HXA104 and the mounting measurements to confirm the unit matches the vehicle’s original alternator before ordering.
• Because alternators can vary within the same model range, match the pulley section, regulator type, and mounting layout as well as the vehicle make and model.

Application and Buying Notes

Before buying, compare the existing alternator against the HXA104 using the 12V rating, 90A output, internal regulator, and twin leg mount details. Even where a vehicle is listed in the fitment family, the safest check is to confirm the mounting centres of 161mm, the 81mm inside mounting legs, and the 7 groove pulley section against the unit being replaced.

The 10mm pivot hole diameter and M8x1.25 adjusting hole are useful confirmation points when matching brackets. If those dimensions do not line up with the original alternator, the unit may not bolt up correctly even if the electrical output is similar.

This alternator is listed for Hitachi style applications, which means the application depends on the original unit design as well as the vehicle model. If the vehicle has had previous repairs, a different engine variant, or a changed charging system, check the existing part number and physical layout carefully rather than relying on the badge on the vehicle alone.

The warranty is 3 years for passenger use and 1 year for commercial use. Keep the purchase details and installation records, and make sure the alternator is tested and fitted by someone who can confirm the charging system condition, belt alignment, and connector compatibility before the vehicle goes back into service.

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 HXA104 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 81mm, Pivot Hole Diameter 10, Pulley Outside Diameter 65mm, Regulator Type Internal, Voltage 12, Mount Cnt to Cnt 161mm, Weight 5.24kg.

Additional published details for cross-checking include Product Group 1 ROTATING ELECTRICAL, Part No. HXA104, Brand OEX, Description OEX Alternator 12V 90A Hitachi Style, Adjusting Hole Diameter M8x1.25, Pin Code IR97, Power Rating (Amp) 90, Pulley Section 7 Groove, Suits Unit Make Hitachi, Alternator Mount Twin Leg.

OEX Alternator 12V 90A Hitachi Style. Part number HXA104 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 7 Groove. Those physical and electrical details should line up with the original unit before the replacement is approved for fitment.

For part number HXA104, 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.

Available application references include HOLDEN COLORADO, HOLDEN COLORADO 2008, HOLDEN COLORADO 2009, HOLDEN COLORADO 2010, ISUZU D-MAX, ISUZU D-MAX 2007. 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.

Compatibility note: Confirm compatibility using the HXA104 part number, the 12V 90A specification, and the listed mounting and pulley measurements before ordering. Fitment should always be checked against the vehicle’s original alternator and application details.

FAQ

Is this alternator new or remanufactured?

This unit is listed as new, not remanufactured.

What is the output rating?

The alternator is rated at 90 amps and 12 volts.

What type of regulator does it use?

It uses an internal regulator.

What pulley and mounting details should I check?

Check the 7 groove pulley, 65mm pulley outside diameter, 81mm inside mounting legs, 161mm mount centre to centre, 10mm pivot hole, and M8x1.25 adjusting hole.

Which vehicles are mentioned in the fitment data?

The fitment data includes Holden Colorado, Holden Rodeo, and Isuzu D-Max, with sample year applications shown across 2007 to 2012 for those ranges.

What warranty is listed?

The listed warranty is 3 years for passenger use and 1 year for commercial use.