Mahle Alternator 12V 120A MG477

The MAHLE Alternator MG477 is a new 12V unit rated at 120A charge current, supplied as each and identified with part number MG477. It uses an internal regulator, clockwise rotation, and a single-leg alternator mount, so the physical layout needs to match the vehicle or machine application before purchase.

Key mounting dimensions include a 51mm mount leg thickness, 10mm pivot hole diameter, 86.0 mounting points diameter, M8x1.25 adjusting hole diameter, and 172mm mount centre to centre. The alternator is supplied without a belt pulley and has a 17mm shaft diameter, which are important checks when matching the existing installation.

This alternator is listed with a dust cover and a W connector/clamp, and it is intended for rotating electrical applications where the original unit matches the MG477 pattern. The one-year warranty applies to the part itself, but correct application matching still depends on verifying the physical measurements, connector style, and pulley arrangement against the vehicle or machine already fitted.

Key Features

• 12V alternator with 120A charge current
• New unit, not remanufactured
• Internal regulator
• Clockwise rotation
• Single-leg alternator mount
• Supplied without belt pulley

Specifications

• Brand: MAHLE
• Part number: MG477
• OEM number: MG477
• Voltage: 12V
• Power rating: 120A
• Alternator charge current: 120A
• Unit of measure: each
• Warranty: one year

Confirmed fitment references

• CASE IH SPX
• CASE IH SPX 1999
• JOHN DEERE 2054
• JOHN DEERE 2054 1990
• JOHN DEERE 2056
• JOHN DEERE 2056 1990
• JOHN DEERE 2058
• JOHN DEERE 2058 1990

Application and Buying Notes

Before ordering, compare the MG477 part number, 12V rating, 120A output, and CW rotation against the original alternator on the machine. The alternator is a single-leg mount design with a 51mm mount leg thickness, so even a close-looking replacement should be checked for the same mounting style and dimensions.

The belt pulley arrangement matters here because this unit is supplied without a belt pulley and the pulley section is listed as not applicable. If the machine requires a specific pulley style or the existing pulley must be transferred, make sure that is suitable for your application before fitting.

Connector style also needs checking. This alternator uses a W connector/clamp and an internal regulator, so the plug and charging system layout must match the vehicle or equipment already in service. The 17mm shaft diameter, 10mm pivot hole, M8x1.25 adjusting hole, and 172mm mount centre to centre are practical confirmation points when comparing parts.

The supplied fitment references include CASE IH SPX and a range of JOHN DEERE applications such as 2054, 2056, 2058, 2064, 2066, 540G III, 548G III, 640G III, 648H, 748G III, 748H, 7500, 7700, 848H, 9500, 9510, 9600, 9610, 9650, 9650 CTS, 9650 CWS, and 9650 STS. Use those references as a guide only and confirm the exact application, year, and mounting details on the machine itself.

The alternator is a new MAHLE unit and is supplied with a one-year warranty, but warranty does not replace the need for correct fitment verification. If the old unit has been modified, fitted with a different pulley, or changed to another connector style, match the physical features carefully before purchase.

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 MG477 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 51mm, Pivot Hole Diameter 10, Pulley Section Not Applicable, Rotation CW, Suits Unit Make Mahle, Note Dust Cover, Item Type Alternator.

Additional published details for cross-checking include New / Reman. New, Alternator Charge Current [A] 120, Connector / Clamp W, Mounting points diameter 86.0, Packaging width 18.60, Net Weight 5182, Product Group 1 ROTATING ELECTRICAL, Part No. MG477, Brand MAHLE, Description Mahle Alternator 12V 120A.

Mahle Alternator 12V 120A. Part number MG477 should be checked first. Listed voltage is 12. Listed output rating is 120. 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 Not Applicable. Those physical and electrical details should line up with the original unit before the replacement is approved for fitment.

For part number MG477, 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 120 should be checked carefully. Incorrect selection can affect installation time, return freight, and equipment availability.

Compatibility note: Confirm fitment by matching the MG477 part number, 12V 120A output, CW rotation, single-leg mount, W connector/clamp, and the listed mounting dimensions against the existing alternator and machine application before ordering.

FAQ

What is the part number for this alternator?

The part number is MG477. It is also listed as the OEM number MG477.

Is this alternator new or remanufactured?

It is listed as new, not remanufactured.

What voltage and output does it have?

It is a 12V alternator with 120A charge current and a 120A power rating.

Does it have an internal regulator?

Yes. The regulator type is internal.

Is a pulley included?

No. It is supplied without a belt pulley, and the pulley section is listed as not applicable.

Which applications are referenced for fitment?

Confirmed fitment references include CASE IH SPX and a range of JOHN DEERE applications, including 2054, 2056, 2058, 2064, 2066, 540G III, 548G III, 640G III, 648H, 748G III, 748H, 7500, 7700, 848H, 9500, 9510, 9600, 9610, 9650, 9650 CTS, 9650 CWS, and 9650 STS.