OEX Alternator 12V 90A Hitachi Style HXA079

The OEX Alternator HXA079 is a new 12V, 90A alternator in Hitachi style, supplied with a twin leg alternator mount and internal regulator. Key dimensions include an 80mm inside mounting leg measurement, 175mm mount centre to centre, an 8mm pivot hole diameter, an M8x1.25 adjusting hole, and a 55mm outside pulley diameter with a 5 groove pulley section.

This unit is listed as suit unit make Hitachi and is part of the rotating electrical range. At 4.96kg, it is a substantial replacement component, so matching the mounting points, pulley configuration, and electrical specification is important before ordering.

OEX supplies products sourced from market leading original equipment manufacturers and aftermarket suppliers, with factories that are ISO9001 certified to support engineering, testing, and quality control procedures. For this alternator, the stated warranty is 3 years passenger and 1 year commercial, which gives a clear service expectation for the intended vehicle use.

The part number is HXA079 and the pin code is IR49. If you are cross-checking against an existing unit, those identifiers, together with the 12V system voltage and 90A output, are the most useful starting points when confirming whether this alternator is the correct replacement.

Key Features

• New alternator, not remanufactured
• 12V system voltage
• 90 amp output rating
• Hitachi style replacement
• Internal regulator
• Twin leg alternator mount

Specifications

• Brand: OEX
• Product type: Alternator
• Part No.: HXA079
• Pin code: IR49
• Voltage: 12V
• Power rating: 90A
• Type: New
• Regulator type: Internal

Fitment guidance

• Fitment data supplied only identifies Subaru applications.
• Listed Subaru groups include Forester, Impreza, Impreza WRX, Legacy, Liberty, and Outback.
• Sample applications shown include Subaru Forester model years 1997 through 2007.
• Because the supplied fitment information is grouped and not fully expanded here, confirm the exact vehicle application against the part number HXA079 and the alternator mounting and pulley details before purchase.

Application and Buying Notes

When replacing an alternator, the main checks are voltage, output, mounting style, and pulley configuration. This unit is 12V and 90A, with an internal regulator, twin leg mount, 5 groove pulley, and a 55mm pulley outside diameter, so the existing vehicle setup needs to match those core details.

The physical dimensions matter just as much as the electrical rating. The 80mm inside mounting legs, 175mm mount centre to centre, 8mm pivot hole, and M8x1.25 adjusting hole give you the best reference points for a direct swap, especially where multiple similar Hitachi style alternators may exist.

The part is a new OEX unit and is not listed as remanufactured. If you are comparing it with the original alternator, use the part number HXA079 and pin code IR49 first, then confirm the mount type, pulley grooves, and dimensions against the existing unit or vehicle records.

Warranty coverage is stated as 3 years for passenger use and 1 year for commercial use. That makes intended use relevant when selecting the part, so it is worth checking whether the vehicle is used privately or in commercial service before relying on the warranty period.

If you are fitting this alternator to a Subaru application, use the supplied Subaru fitment references as a guide only and confirm the exact model, year, and engine setup against the vehicle’s current alternator. The grouped fitment information points to Forester, Impreza, Impreza WRX, Legacy, Liberty, and Outback, but the final check should always be the physical and part-number match.

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 HXA079 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 80mm, Pivot Hole Diameter 8, Pulley Outside Diameter 55mm, Regulator Type Internal, Voltage 12, Mount Cnt to Cnt 175mm, Weight 4.96kg.

Additional published details for cross-checking include Product Group 1 ROTATING ELECTRICAL, Part No. HXA079, Brand OEX, Description OEX Alternator 12V 90A Hitachi Style, Adjusting Hole Diameter M8x1.25, Pin Code IR49, Power Rating (Amp) 90, Pulley Section 5 Groove, Suits Unit Make Hitachi, Alternator Mount Twin Leg.

OEX Alternator 12V 90A Hitachi Style. Part number HXA079 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 HXA079, 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.

Compatibility note: Confirm compatibility by matching part number HXA079, pin code IR49, 12V 90A output, Hitachi style application details, and the mounting and pulley dimensions against the vehicle’s existing alternator before ordering.

FAQ

Is this alternator new or remanufactured?

This OEX alternator is listed as new.

What is the electrical rating of this unit?

It is a 12V alternator with a 90A power rating.

What type of regulator does it use?

The alternator uses an internal regulator.

What pulley setup does it have?

It has a 5 groove pulley section and a 55mm pulley outside diameter.

What mounting measurements are provided?

The listed mounting details are 80mm inside mounting legs, 175mm mount centre to centre, an 8mm pivot hole diameter, and an M8x1.25 adjusting hole diameter.

What warranty is stated for this alternator?

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