Mahle Alternator 12V 65A MG21

The Mahle Alternator 12V 65A is a new alternator supplied as each unit, with a 65 amp power rating and internal regulator. It is listed under part number MG21 and uses a single leg alternator mount, which makes the mounting style a key check before purchase.

This unit is configured with a 12V electrical system, a pulley section A, and a belt pulley fitted from new. The pulley outside diameter is 68mm, and the alternator uses one belt. Those details matter when comparing the existing unit in the machine, especially where belt alignment and pulley profile need to match the original application.

Mounting and clearance measurements are also specific on this alternator: mount leg thickness is 32mm, mounting bores distance is 32.0, mount centre to centre is 115mm, adjusting hole diameter is 11mm, pivot hole diameter is 10mm, and the distance from the pulley to the alternator is 51.7mm. These measurements are the practical checks that help confirm whether MG21 is the correct replacement before ordering.

Key Features

• New alternator
• 12V system
• 65A charge current
• Internal regulator
• Single leg alternator mount
• Supplied with belt pulley

Specifications

• Brand: Mahle
• Product type: Alternator
• Unit of measure: Each
• Power rating: 65A
• Voltage: 12V
• Regulator type: Internal
• Pulley section: A
• Pulley outside diameter: 68mm

Known application guidance

• Ammann RW1805
• Ammann RW1805 2011
• Ammann RW1805 2012
• Belarus 320R
• Belarus 320R 1991
• Belarus Series 100
• Belarus Series 100 2008
• Belarus Series 100 2010

Application and Buying Notes

Before ordering, compare the existing alternator against the listed mounting and pulley details for MG21. The important checks here are the 12V system, 65A output, single leg mount, internal regulator, 68mm pulley outside diameter, and the A section pulley with one belt. If any of those differ on the machine, it is worth rechecking the application before fitting.

The mount measurements are especially useful for identification. This unit lists 32mm mount leg thickness, 32.0 mounting bores distance, 115mm mount centre to centre, 11mm adjusting hole diameter, 10mm pivot hole diameter, and 51.7mm from pulley to alternator. Matching those dimensions to the removed unit can help avoid a mismatch even when the engine or machine family is similar.

Fitment is listed for Ammann RW1805, Belarus 320R and Series 100, Haulotte HA120PX, Lombardini LDW1204, LDW1204T, LDW1503 and LDW2004, plus Wacker Neuson RD16-90 across the years shown. Even with that application coverage, it is still best practice to confirm the part number MG21 and the physical measurements against the original alternator, as equipment can vary within a model range.

This alternator is supplied new and carries a one year warranty. That does not replace the need to verify the charging system layout, pulley style, and mounting points before installation. Where the existing unit has been modified, damaged, or changed previously, the physical measurements become more important than the model name alone.

If the current alternator is still fitted, check the housing style, the number of belts, and the pulley section before removing the old unit completely. Having the old part beside MG21 makes it easier to compare the single leg mount, bore spacing, and pulley offset, which are the details most likely to determine whether the part will suit the machine cleanly.

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 MG21 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 32mm, Power Rating (Amp) 65, Pulley Section A, Suits Unit Make Mahle, Alternator Mount Single Leg, New / Reman. New, Pulleys with belt pulley.

Additional published details for cross-checking include Mounting Bores Distance 32.0, Number of belts 1, Packaging length 24.8, Packaging height 17.50, Product Group 2 ALTERNATORS, Part No. MG21, Brand MAHLE, Description Mahle Alternator 12V 65A, Adjusting Hole Diameter 11.

Mahle Alternator 12V 65A. Part number MG21 should be checked first. Listed voltage is 12. Listed output rating is 65. 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 A. Those physical and electrical details should line up with the original unit before the replacement is approved for fitment.

For part number MG21, 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 65 should be checked carefully. Incorrect selection can affect installation time, return freight, and equipment availability.

Available application references include AMMANN RW1805, AMMANN RW1805 2011, AMMANN RW1805 2012, BELARUS 320R, BELARUS 320R 1991, BELARUS SERIES 100. 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 fitment using part number MG21, the 12V 65A specification, and the listed mounting and pulley measurements before purchase. Application details are provided for guidance only, and the existing alternator should be matched physically where possible.

FAQ

What is the part number for this alternator?

The part number is MG21.

What voltage and output does this alternator have?

It is a 12V alternator with a 65A charge current rating.

Does this alternator have an internal regulator?

Yes. The listed regulator type is internal.

Is the alternator supplied new or remanufactured?

It is listed as new.

What pulley details are listed?

It has a belt pulley fitted, an A section pulley, a 68mm pulley outside diameter, and it uses one belt.

What warranty is provided?

The listed warranty is one year.