OEX Alternator 12V 125A Denso Style DXA4138

The OEX Alternator 12V 125A Denso Style, part number DXA4138, is a new alternator supplied in each unit and built for 12 volt charging systems with a 125 amp output. It suits Denso applications and uses a pad mount arrangement, with a 6 groove pulley and a pulley outside diameter of 52.5mm.

This alternator has a pivot hole diameter of 10mm, a mount leg thickness of 65mm, and a mount centre-to-centre measurement of 163mm. Those dimensions matter when checking that the replacement unit will physically match the vehicle’s mounting points and belt drive setup before purchase.

OEX lists this alternator under its rotating electrical range, and the product is backed by a three year warranty. It weighs 4.96kg, which can be useful when comparing against the removed unit if you are confirming that the replacement is in the same category and style as the original part.

Key Features

• 12V alternator with 125 amp output
• New unit, supplied each
• Denso style and suits Denso applications
• Pad mount alternator
• 6 groove pulley
• Pulley outside diameter: 52.5mm

Specifications

• Brand: OEX
• Product type: Alternator
• Power rating: 125A
• Voltage: 12V
• Unit of measure: Each
• New / remanufactured: New
• Suits unit make: Denso
• Alternator mount: Pad

Fitment guidance

• TOYOTA: RAV 4, RAV 4 2018

Application and Buying Notes

Before ordering, compare the part number DXA4138 with the alternator being removed, then check the physical details against your original unit: 12V system, 125A output, pad mount, 6 groove pulley, 52.5mm pulley outside diameter, 10mm pivot hole, 65mm mount leg thickness, and 163mm mount centre-to-centre. Those measurements are the practical checks that help confirm you are looking at the correct style of replacement.

The “Denso style” and “suits unit make: Denso” details are important, but they should not be treated as a blanket fitment guarantee on their own. The safest approach is to match the part number, mounting style, pulley section, and the key dimensions above against the vehicle’s existing alternator or parts information.

If you are replacing a charging fault, remember that alternators are only one part of the charging system. Correct belt condition, pulley alignment, electrical connections, and battery health all affect how the vehicle charges once the new unit is fitted. A correctly matched 12V 125A alternator should still be checked in the vehicle after installation to confirm it is the right application for the job.

This unit is listed as new and carries a three year warranty, which offers reassurance for the part itself, but it does not replace the need to verify application details first. If the original alternator differs in mounting, pulley count, or dimensions, compare carefully before fitting, as small differences can prevent proper installation or belt tracking.

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 DXA4138 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 Three Years, Pivot Hole Diameter 10, Pulley Outside Diameter 52.5mm, Suits Unit Make Denso, Alternator Mount Pad, New / Reman. New, Product Group 2 ALTERNATORS.

Additional published details for cross-checking include Part No. DXA4138, Brand OEX, Description OEX Alternator 12V 125A Denso Style, Mount Leg Thickness 65mm, Power Rating (Amp) 125, Pulley Section 6 Groove, Voltage 12, Mount Cnt to Cnt 163mm, Weight 4.96kg, Product Group 1 ROTATING ELECTRICAL.

OEX Alternator 12V 125A Denso Style. Part number DXA4138 should be checked first. Listed voltage is 12. Listed output rating is 125. These details form the core reference points used by parts interpreters when confirming the correct replacement.

Mount style is Pad. 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 DXA4138, 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 125 should be checked carefully. Incorrect selection can affect installation time, return freight, and equipment availability.

Compatibility note: Confirm compatibility by checking part number DXA4138, 12V charging system details, Denso style application, pad mount configuration, 6 groove pulley, and the listed mounting measurements against the original alternator or vehicle application information before purchase.

FAQ

What is the part number for this alternator?

The part number is DXA4138. For this listing, part number DXA4138 is the main reference point. Listed voltage is 12. Listed output rating is 125. Published fitment references include TOYOTA RAV 4, TOYOTA RAV 4 2018. 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 DXA4138 is the main reference point. Listed voltage is 12. Listed output rating is 125. Published fitment references include TOYOTA RAV 4, TOYOTA RAV 4 2018. 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 125 amp power rating. For this listing, part number DXA4138 is the main reference point. Listed voltage is 12. Listed output rating is 125. Published fitment references include TOYOTA RAV 4, TOYOTA RAV 4 2018. These details should still be checked against the original unit before ordering.

What mounting style does it use?

It uses a pad mount arrangement. For this listing, part number DXA4138 is the main reference point. Listed voltage is 12. Listed output rating is 125. Published fitment references include TOYOTA RAV 4, TOYOTA RAV 4 2018. These details should still be checked against the original unit before ordering.

What pulley details are listed?

It has a 6 groove pulley with a pulley outside diameter of 52.5mm. For this listing, part number DXA4138 is the main reference point. Listed voltage is 12. Listed output rating is 125. Published fitment references include TOYOTA RAV 4, TOYOTA RAV 4 2018. These details should still be checked against the original unit before ordering.

What should I check before ordering?

Check the part number, 12V and 125A rating, Denso application, pad mount style, and the listed dimensions: 10mm pivot hole diameter, 65mm mount leg thickness, and 163mm mount centre-to-centre. For this listing, part number DXA4138 is the main reference point. Listed voltage is 12. Listed output rating is 125. Published fitment references include TOYOTA RAV 4, TOYOTA RAV 4 2018. These details should still be checked against the original unit before ordering.