OEX Alternator 12V 70A Hitachi Style HXA078

The OEX Alternator HXA078 is a new 12V, 70A unit in Hitachi style, supplied as an each. It is listed with a twin leg alternator mount, internal regulator, and a B section pulley with an outside diameter of 82mm.

Key mounting and dimensional details include 81mm inside mounting legs, 170mm mount centre to centre, a 10mm pivot hole diameter, M8x1.25 adjusting hole diameter, and a 17mm shaft dimension. These measurements matter when checking physical interchange before purchase.

This alternator is noted as suitable for Hitachi applications and includes a 60cc vacuum pump note, along with an adaptor to suit HXK-08. Weight is listed at 6.6kg, and the unit is backed by a 3 year passenger / 1 year commercial warranty.

Key Features

• New alternator, not remanufactured
• 12V, 70A output
• Hitachi style unit
• Internal regulator
• Twin leg alternator mount
• B section pulley, 82mm outside diameter

Specifications

• Part No.: HXA078
• Brand: OEX
• Voltage: 12V
• Power rating: 70A
• Type: Alternator
• New / Reman.: New
• Regulator type: Internal
• Alternator mount: Twin leg

Fitment guidance

• Suits Hitachi applications as listed
• Fitment references include Holden, Isuzu, Nissan and TCM applications
• Sample listed applications include Holden Gemini, Isuzu 4JB1, Isuzu Elf, Nissan Patrol and TCM 820-2
• Listed year references include 1980s and 1990s applications in the supplied fitment data

Application and Buying Notes

Before ordering, check the part number HXA078 against the alternator already fitted to the vehicle or equipment. The most useful physical checks here are the twin leg mount, 81mm inside mounting legs, 170mm mount centre to centre, 10mm pivot hole, and M8x1.25 adjusting hole.

The pulley specification also matters. This unit has an 82mm outside diameter pulley with a B section belt profile, so the belt type and pulley size should be matched to the existing setup rather than assumed.

Because this alternator is listed as a Hitachi style unit with an internal regulator, it should be matched carefully to the electrical arrangement already in the vehicle. The note mentioning a 60cc vacuum pump and an adaptor to suit HXK-08 is also relevant where that equipment is part of the application.

The listed fitment references cover a range of Holden, Isuzu, Nissan and TCM applications, including Gemini, 4JB1, Elf, Patrol and 820-2 entries. Even so, matching by application name alone is not enough; the safest check is the combination of part number, mount style, pulley details and the existing unit's dimensions.

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 HXA078 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 82mm, Regulator Type Internal, Voltage 12, Alternator Mount Twin Leg, New / Reman. New.

Additional published details for cross-checking include Weight 6.6kg, Product Group 1 ROTATING ELECTRICAL, Part No. HXA078, Brand OEX, Description OEX Alternator 12V 70A Hitachi Style, Adjusting Hole Diameter M8x1.25, Pin Code IR9, Power Rating (Amp) 70, Pulley Section B, Suits Unit Make Hitachi.

OEX Alternator 12V 70A Hitachi Style. Part number HXA078 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 Twin Leg. Regulator type is Internal. Pulley configuration is B. Those physical and electrical details should line up with the original unit before the replacement is approved for fitment.

For part number HXA078, 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.

Compatibility note: Confirm fitment by checking part number HXA078, the Hitachi style application, and the listed mount and pulley measurements against the unit already on the vehicle or equipment before ordering.

FAQ

What is the part number for this alternator?

The part number is HXA078. For this listing, part number HXA078 is the main reference point. Listed voltage is 12. Listed output rating is 70. Published fitment references include HOLDEN GEMINI, HOLDEN GEMINI 1981, HOLDEN GEMINI 1982. 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 HXA078 is the main reference point. Listed voltage is 12. Listed output rating is 70. Published fitment references include HOLDEN GEMINI, HOLDEN GEMINI 1981, HOLDEN GEMINI 1982. 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 70A power rating. For this listing, part number HXA078 is the main reference point. Listed voltage is 12. Listed output rating is 70. Published fitment references include HOLDEN GEMINI, HOLDEN GEMINI 1981, HOLDEN GEMINI 1982. These details should still be checked against the original unit before ordering.

Does it have an internal regulator?

Yes. The regulator type is listed as internal. For this listing, part number HXA078 is the main reference point. Listed voltage is 12. Listed output rating is 70. Published fitment references include HOLDEN GEMINI, HOLDEN GEMINI 1981, HOLDEN GEMINI 1982. These details should still be checked against the original unit before ordering.

What mounting and pulley details should I check?

Check the twin leg mount, 81mm inside mounting legs, 170mm mount centre to centre, 10mm pivot hole, M8x1.25 adjusting hole, and the 82mm outside diameter B section pulley. For this listing, part number HXA078 is the main reference point. Listed voltage is 12. Listed output rating is 70. Published fitment references include HOLDEN GEMINI, HOLDEN GEMINI 1981, HOLDEN GEMINI 1982. These details should still be checked against the original unit before ordering.

What warranty is listed?

The listed warranty is 3 years for passenger use and 1 year for commercial use. For this listing, part number HXA078 is the main reference point. Listed voltage is 12. Listed output rating is 70. Published fitment references include HOLDEN GEMINI, HOLDEN GEMINI 1981, HOLDEN GEMINI 1982. These details should still be checked against the original unit before ordering.