OEX DXA4005 Alternator 12V 55A Denso Style

A brand new Denso-style alternator built to restore reliable 12V charging to your vehicle.

Product Overview

The OEX DXA4005 is a brand new 12V, 55A alternator designed as a direct-style replacement for Denso-unit applications. Featuring an internal voltage regulator, twin leg mount, and an IR74 pin code, it is engineered to match the key dimensions and electrical specifications of the original Denso-style unit it replaces — simplifying installation without modification in compatible applications.

With a 70mm Section A pulley, 10mm pivot hole, M8×1.25 adjusting hole, 75mm inside mounting leg spread, and a 172mm mount centre-to-centre distance, the DXA4005 is built to drop into the existing bracket and belt configuration of suitable vehicles. This is a new unit — not remanufactured — backed by a one-year OEX warranty.

Key Specifications

• 12V system voltage
• 55A output rating
• Denso-style replacement unit
• Internal voltage regulator (no external regulator required)
• Twin leg alternator mount configuration
• Mount centre-to-centre distance: 172mm
• Inside mounting leg spread: 75mm
• Pivot hole diameter: 10mm
• Adjusting hole thread: M8×1.25
• Pulley outside diameter: 70mm
• Pulley section: A (standard V-belt profile)
• Pin code: IR74
• Brand new unit — not remanufactured
• Weight: 3.4 kg
• 1-year OEX warranty

Features & Benefits

• Internal voltage regulator — Self-contained regulation eliminates dependency on an external regulator, simplifying the electrical circuit and reducing potential failure points. No additional regulator wiring or components required on installation.
• Brand new unit — Unlike remanufactured alternators, the DXA4005 ships as a new unit with fresh internals — no worn brushes, degraded bearings, or reused components to worry about from day one.
• Denso-style design — Engineered to match the mounting geometry and electrical interface of original Denso-unit applications, reducing installation time and the need for custom bracket or wiring modifications.
• Twin leg mount with 172mm centre-to-centre — Precise mounting dimensions allow direct fitment into the original alternator bracket on compatible applications without adaptor plates or spacers.
• 70mm Section A pulley — Standard V-belt pulley profile compatible with existing drive belt configurations on supported engines, eliminating the need for belt replacement or tensioner adjustment in most cases.
• 55A output — Provides sufficient charge capacity for vehicles running standard factory electrical loads, with appropriate headroom for moderate auxiliary additions like driving lights or a UHF radio.
• M8×1.25 adjusting hole — Standard thread specification for alternator belt tensioning, compatible with OEM-style adjustment bolts on supported brackets.

Technical Specs

• Part Number: DXA4005
• Brand: OEX
• Type: Alternator
• Suits Unit Make: Denso
• Voltage: 12V
• Power Rating: 55A
• Regulator Type: Internal
• Pin Code: IR74
• Mount Type: Twin Leg
• Mount Centre-to-Centre: 172mm
• Inside Mounting Legs: 75mm
• Pivot Hole Diameter: 10mm
• Adjusting Hole: M8×1.25
• Pulley Outside Diameter: 70mm
• Pulley Section: A
• Condition: New (not remanufactured)
• Weight: 3.4 kg
• Warranty: 1 year
• Unit of Measure: Each

Compatible With / Goes Well With

• Vehicles originally fitted with Denso-style 12V alternators matching the above mounting and electrical specifications
• Applications requiring IR74 pin code internal regulator alternators
• Standard Section A V-belt drive systems with 70mm pulley compatibility
• Twin-leg bracket mounting configurations with 172mm centre-to-centre spacing and 75mm inside leg spread

Important: Compatibility must be verified against your specific vehicle make, model, engine, and build date before purchase. Cross-reference the pin code (IR74), mount dimensions (172mm C-C, 75mm inside legs), pivot hole (10mm), and adjusting hole (M8×1.25) against your original unit or vehicle workshop manual. If unsure, consult a qualified auto electrician before ordering.

Weight

3.4 kg.

Frequently Asked Questions

Is this a new alternator or a remanufactured unit?

The DXA4005 is a brand new alternator — not remanufactured. It ships with all new internal components including windings, brushes, and bearings, with no previously used parts.

How do I confirm this alternator will fit my vehicle?

Cross-reference the pin code (IR74), mount centre-to-centre (172mm), inside mounting leg spread (75mm), pivot hole diameter (10mm), adjusting hole thread (M8×1.25), and pulley OD (70mm) against your original unit or vehicle workshop manual. When in doubt, consult a qualified auto electrician.

Does this alternator require an external voltage regulator?

No — the DXA4005 features an internal voltage regulator, meaning no separate external regulator is required. The regulation circuit is self-contained within the alternator body.

What belt type does the 70mm Section A pulley suit?

The Section A pulley is designed for standard A-profile V-belts, which are the most common belt type found on vehicles running Denso-style alternators. In most compatible applications, the existing drive belt can be reused.

What warranty does this alternator carry?

The OEX DXA4005 is backed by a one-year OEX warranty. Retain your proof of purchase and ensure installation is carried out correctly, as warranty claims relating to incorrect fitment or installation may not be covered.