OEX Alternator 12V 65A Hitachi Style RXA066

The OEX RXA066 is a 12V, 65A alternator in Hitachi style, supplied as a remanufactured unit with an internal regulator. It is listed with a twin leg alternator mount, 67mm inside mounting legs, a 175mm centre-to-centre mounting dimension, and an M10 pivot hole diameter.

This alternator uses a 4 groove pulley with a 59mm outside diameter and an M8 x 1.25 adjusting hole. It is noted as ECU voltage control, with an adaptor to suit HXK-32 and HXK-24. Those details matter when matching the unit to the vehicle and existing charging system setup.

OEX products are sourced from market leading original equipment manufacturers and aftermarket suppliers, and the brand states its factories are ISO9001 certified. The unit is backed by a 3 year passenger / 1 year commercial warranty, which gives a clear use-case guide depending on how the vehicle is operated.

Key Features

• 12V alternator with 65A output
• Hitachi style unit
• Remanufactured construction
• Internal regulator
• Twin leg alternator mount
• ECU voltage control

Specifications

• Brand: OEX
• Part No.: RXA066
• Product type: Alternator
• Power rating: 65 amp
• Voltage: 12V
• Unit of measure: Each
• New / remanufactured: Remanufactured
• Suits unit make: Hitachi

Fitment guidance

• Mazda 121
• Mazda 121 Metro
• Mazda 121 1990
• Mazda 121 1991
• Mazda 121 1992
• Mazda 121 1993
• Mazda 121 1994
• Mazda 121 1995

Application and Buying Notes

Before ordering, compare the part number RXA066, the Hitachi style design, and the mounting measurements against the alternator already fitted to the vehicle. The listed details include 67mm inside mounting legs, 175mm mount centre to centre, an M10 pivot hole, and an M8 x 1.25 adjusting hole, so these dimensions should be checked carefully rather than assumed.

The pulley setup is also important. This unit has a 4 groove pulley with a 59mm outside diameter, which needs to match the belt arrangement on the vehicle. If the belt style or groove count does not line up, the alternator may not suit the application even if the electrical rating appears similar.

Electrical control should be checked as well. This alternator is listed with an internal regulator and ECU voltage control, and it includes an adaptor to suit HXK-32 and HXK-24. Those items are relevant when confirming whether the replacement will connect correctly and operate within the vehicle’s charging system requirements.

The 65A output is a useful reference point when comparing against the original unit. It is not wise to choose an alternator based on output alone, because mounting pattern, pulley type, regulator arrangement, and plug connection all need to align. If any of those details differ, the safer approach is to verify the match by part number and application details before fitting.

This is a remanufactured alternator, not a brand new assembly. For buyers, that means it is important to confirm the vehicle’s existing mounting and charging configuration first, then select the replacement on the basis of the verified measurements and identifiers listed here. That approach helps avoid unnecessary returns and downtime.

The warranty is 3 years for passenger use and 1 year for commercial use. That is useful when deciding how the vehicle is used, but it should be read alongside the physical and electrical checks above. A warranty does not replace a correct fitment 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 RXA066 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 67mm, Pivot Hole Diameter M10, Pulley Outside Diameter 59mm, Regulator Type Internal, Voltage 12, Alternator Mount Twin Leg, New / Reman. Remanufactured.

Additional published details for cross-checking include Product Group 2 ALTERNATORS, Part No. RXA066, Brand OEX, Description OEX Alternator 12V 65A Hitachi Style, Adjusting Hole Diameter M8 x 1.25, Pin Code IR29, Power Rating (Amp) 65, Pulley Section 4 Groove, Suits Unit Make Hitachi.

OEX Alternator 12V 65A Hitachi Style. Part number RXA066 should be checked first. Listed voltage is 12. Listed output rating is 65. 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 4 Groove. Those physical and electrical details should line up with the original unit before the replacement is approved for fitment.

Compatibility note: Confirm compatibility using the part number RXA066, the Hitachi style application, and the listed mounting, pulley, and regulator details before purchase. If the existing alternator differs in groove count, mounting dimensions, or plug/control setup, do not rely on appearance alone.

FAQ

What type of alternator is this?

It is an OEX alternator, 12V and 65A, in Hitachi style. It is listed as remanufactured with an internal regulator and twin leg mounting.

What is the part number?

The part number is RXA066. Using the part number is the most reliable first check when comparing against the existing alternator or vehicle application.

What pulley does it use?

It uses a 4 groove pulley with a 59mm outside diameter. The groove count and size need to match the vehicle’s belt arrangement.

Does it suit ECU voltage control?

Yes. The notes list ECU voltage control, and also mention an adaptor to suit HXK-32 and HXK-24. Those details should be checked against the vehicle’s charging setup.

What warranty is listed?

The warranty is 3 years for passenger use and 1 year for commercial use. That is the stated warranty split for this alternator.

Which vehicles are shown in the fitment guidance?

Mazda 121 and Mazda 121 Metro are shown, including model years 1990 to 1997 in the provided fitment guidance. The listed fitment should still be checked against the part number and mounting details before ordering.