Mahle Alternator 12V 75A MG479

The Mahle Alternator MG479 is a new 12V, 75A alternator supplied as each unit, with a one year warranty. It is listed with OEM number 11204382 and is designed as a single leg alternator with an internal regulator, which are key details to match when checking a replacement.

This unit is supplied with a belt pulley and uses a B pulley section, with a pulley outside diameter of 85mm. The alternator rotates clockwise and is specified with one belt, so it is important to compare the pulley and belt arrangement against the unit being replaced before ordering.

Physical mounting details are also defined: mount leg thickness is 56mm, pivot hole diameter is 8, mounting bores distance is 56.0, mounting points diameter is 86.0, and the adjusting hole diameter is M8x1.25. Those measurements matter just as much as the electrical rating when confirming the correct replacement.

Mahle identifies this alternator as part number MG479 and pin code IR165, with a listed power rating and charge current of 75A at 12V. If the existing alternator differs in mount style, pulley setup, rotation, or regulator type, that should be checked carefully before fitting.

Key Features

• New Mahle alternator
• 12V system, 75A output
• Internal regulator
• Single leg alternator mount
• Supplied with belt pulley
• Clockwise rotation

Specifications

• Brand: Mahle
• Part No.: MG479
• OEM Number: 11204382
• Voltage: 12V
• Power Rating / Charge Current: 75A
• Regulator Type: Internal
• Alternator Mount: Single Leg
• Rotation: CW

Known fitment references

• John Deere 3029D
• John Deere 4.239T
• John Deere 4.276D
• John Deere 4039T
• John Deere 4045H

Application and Buying Notes

Before ordering, compare the part number MG479 and OEM number 11204382 with the alternator being replaced. The mounting pattern is specific: single leg mount, 56mm mount leg thickness, 56.0 mounting bores distance, 86.0 mounting points diameter, and an M8x1.25 adjusting hole. If any of those points differ on the current unit, the alternator may not suit without further checking.

The electrical side should also be matched with care. This alternator is 12V and rated at 75A, with an internal regulator. That means the vehicle or machine must be set up for the same voltage and regulator arrangement, rather than relying on appearance alone.

Pulley details are another important checkpoint. This unit has a belt pulley, B section pulley, 85mm outside diameter, clockwise rotation, and one-belt setup. If the original alternator uses a different pulley profile, belt count, or rotation, the replacement should be confirmed against the existing application before installation.

Where fitment is listed against John Deere applications, use it as a reference point only and still verify against the machine currently fitted. Matching the stated application, part number, and mounting dimensions is the safest way to avoid downtime and unnecessary returns.

The alternator is sold individually and is a new unit, not remanufactured. For buyers comparing options, that means the key checks are the same whether the machine is a John Deere 3029D, 4.239T, 4.276D, 4039T, or 4045H reference application: part number, voltage, amperage, regulator type, and the mounting and pulley 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 MG479 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 One Year, Mount Leg Thickness 56mm, Pivot Hole Diameter 8, Pulley Outside Diameter 85mm, Regulator Type Internal, Suits Unit Make Mahle, Alternator Mount Single Leg, OEM Number 11204382.

Additional published details for cross-checking include Pulleys with belt pulley, Mounting points diameter 86.0, Distance from pulley to the alternator 27.7, Packaging width 17.60, Net Weight 4770, Product Group 1 ROTATING ELECTRICAL, Part No. MG479, Brand MAHLE, Description Mahle Alternator 12V 75A, Adjusting Hole Diameter M8x1.25.

Mahle Alternator 12V 75A. Part number MG479 should be checked first. Listed voltage is 12. Listed output rating is 75. These details form the core reference points used by parts interpreters when confirming the correct replacement.

Mount style is Single 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 MG479, 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 75 should be checked carefully. Incorrect selection can affect installation time, return freight, and equipment availability.

Available application references include JOHN DEERE 3029D, JOHN DEERE 3029D 1995, JOHN DEERE 4.239T, JOHN DEERE 4.239T 1989. 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.

Compatibility note: Confirm compatibility by checking the part number MG479, OEM number 11204382, and the listed mounting, pulley, voltage, and regulator details against the alternator currently fitted to the machine.

FAQ

What is the output of this alternator?

It is rated at 12V and 75A, with the alternator charge current also listed as 75A.

Does this alternator have an internal regulator?

Yes. The regulator type is listed as internal.

Is the pulley included?

Yes. It is listed as supplied with a belt pulley.

What rotation does this alternator use?

The rotation is clockwise (CW).

What part numbers should I check before buying?

Check Mahle part number MG479 and OEM number 11204382 against the unit being replaced.

Which measurements are most important for fitment?

Key measurements listed are mount leg thickness 56mm, pivot hole diameter 8, mounting bores distance 56.0, mounting points diameter 86.0, adjusting hole diameter M8x1.25, pulley outside diameter 85mm, and distance from pulley to the alternator 27.7.