OEX Alternator 12V 100A Denso Style DXA503

The OEX Alternator DXA503 is a new 12V, 100 amp unit in Denso style, supplied as an alternator for rotating electrical applications. It uses an internal regulator and a twin leg alternator mount, with a 58mm inside mounting leg dimension and a 10mm pivot hole diameter.

This unit is listed with a 6 groove pulley measuring 49mm outside diameter, and the mount centre to centre dimension is 185mm. The adjusting hole is M8x1.25, which is a useful check when comparing the unit against the vehicle’s existing mounting arrangement.

OEX identifies this alternator as suitable for Delco unit make applications, with pin code IR189 and part number DXA503. It is backed by a 3 year passenger / 1 year commercial warranty, and the unit weight is 5.3kg.

Key Features

• 12V alternator with 100A output
• New unit, not remanufactured
• Internal regulator
• Twin leg alternator mount
• 6 groove pulley, 49mm outside diameter
• Part number DXA503

Specifications

• Voltage: 12V
• Power rating: 100 amp
• Type: Alternator
• Unit of measure: Each
• New / Reman.: New
• Regulator type: Internal
• Alternator mount: Twin leg
• Inside mounting legs: 58mm

Compatibility guidance

• Fitment is indicated for applications using a Delco alternator arrangement.
• The supplied fitment data references Holden Astra, Barina, Calibra, Combo, Frontera, Tigra and Vectra.
• The supplied fitment data also references Opel Corsa and Opel Manta.
• Because the fitment list is application-specific, confirm the part number DXA503 and the mounting and pulley details against the existing alternator before ordering.

Application and Buying Notes

When checking whether this alternator is suitable, start with the part number DXA503, the 12V system voltage, and the 100A output rating. Those details should match the vehicle’s charging system requirements before you look at anything else.

Physical fit is just as important as electrical specification. This unit has a twin leg mount, 58mm inside mounting legs, a 10mm pivot hole, M8x1.25 adjusting hole, and 185mm mount centre to centre, so those dimensions need to line up with the original alternator mounting points.

The pulley specification is also worth confirming. This alternator uses a 6 groove pulley with a 49mm outside diameter, and the note supplied advises that for applications with a 5PK belt, the appropriate grooves on the alternator pulley should be used. That makes belt type and pulley alignment important checks before installation.

The unit is new and carries an internal regulator, which means it is intended for applications that match that regulator style. If your existing alternator uses a different mounting arrangement, pulley setup, or regulator configuration, compare those details carefully rather than relying on appearance alone.

Warranty coverage is 3 years for passenger use and 1 year for commercial use. That can be useful when choosing between replacement options, but the key buying decision should still be based on correct identification of the vehicle application, part number, and mounting measurements.

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 DXA503 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 58mm, Pivot Hole Diameter 10, Pulley Outside Diameter 49mm, Regulator Type Internal, Voltage 12, Alternator Mount Twin Leg, New / Reman. New.

Additional published details for cross-checking include Product Group 2 ALTERNATORS, Part No. DXA503, Brand OEX, Description OEX Alternator 12V 100A Denso Style, Adjusting Hole Diameter M8x1.25, Pin Code IR189, Power Rating (Amp) 100, Pulley Section 6 Groove, Suits Unit Make Delco.

OEX Alternator 12V 100A Denso Style. Part number DXA503 should be checked first. Listed voltage is 12. Listed output rating is 100. 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 6 Groove. Those physical and electrical details should line up with the original unit before the replacement is approved for fitment.

For part number DXA503, 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 100 should be checked carefully. Incorrect selection can affect installation time, return freight, and equipment availability.

Available application references include HOLDEN ASTRA, HOLDEN ASTRA 1984, HOLDEN ASTRA 1985, HOLDEN ASTRA 1986, OPEL CORSA, OPEL CORSA 1996. 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: Please confirm fitment using part number DXA503, the Delco unit make reference, and the mounting and pulley dimensions before purchase. If there is any difference in mount style, belt groove count, or regulator arrangement, compare the existing unit carefully.

FAQ

What is the part number for this alternator?

The part number is DXA503.

What voltage and output does it have?

It is a 12V alternator with a 100 amp power rating.

Is this a new or remanufactured unit?

This alternator is listed as new.

What pulley does it use?

It has a 6 groove pulley with a 49mm outside diameter.

What regulator type is fitted?

It uses an internal regulator.

Which applications are referenced in the fitment data?

The fitment data references Holden Astra, Barina, Calibra, Combo, Frontera, Tigra and Vectra, plus Opel Corsa and Opel Manta. Confirm the exact application against the part number and mounting details before ordering.