Niehoff Alternator 24V 225A NXA9304 With A2-357 Regulator

The Niehoff NXA9304 is a new 24V alternator rated at 225A, supplied each and fitted with an external regulator. It is listed with a 22mm shaft diameter and 100mm mount leg thickness, so it is important to compare those physical details with the unit being replaced before ordering.

This alternator is identified as a Niehoff unit for Niehoff applications, and the note confirms an A2-357 regulator is included. For buyers matching a charging system by part number, the key identifiers here are NXA9304, 24V, 225A, and the external regulator setup.

Niehoff positions this alternator for heavy duty use, with brushless construction and design intent aimed at demanding applications. If your requirement is a 24V charging unit with a high output rating, the 225A specification makes this a significant component to verify carefully against the original installation.

The mount type is pad, and the alternator is sold new rather than remanufactured. Those details matter when confirming bracket style, mounting arrangement, and electrical compatibility on the vehicle or machine already in service.

Key Features

• 24V alternator with 225A output
• New unit, sold each
• External regulator type
• A2-357 regulator included
• Pad mount alternator
• 22mm shaft diameter

Specifications

• Brand: Niehoff
• Product type: Alternator
• Part No.: NXA9304
• Voltage: 24V
• Amp rating: 225A
• Regulator type: External
• Regulator included: A2-357
• Alternator mount: Pad

Application and Buying Notes

Before ordering, compare the part number NXA9304 with the unit you are replacing. The listed 24V, 225A rating and external regulator arrangement need to match the charging system requirements of the application, especially where the original alternator uses a different regulator style or output level.

Physical dimensions are just as important as electrical ratings. This alternator lists a 22mm shaft diameter, a 100mm mount leg thickness, and a pad mount arrangement, so the mounting face, bracket alignment, and shaft interface should be checked against the existing setup before purchase.

The A2-357 regulator is included, which adds a useful identifier when confirming compatibility with the intended system. Even when the alternator brand matches, fit should still be checked against the machine or vehicle’s existing part number, mounting pattern, and electrical configuration.

Because this is a 24V, 225A alternator, it is best suited to systems already designed for that charging specification. Do not rely on brand alone; confirm the original unit’s voltage, amperage, regulator type, and mounting details to avoid downtime and avoidable returns.

If you are replacing a Niehoff alternator in a heavy duty application, the brushless design and external regulation are relevant points to verify alongside the physical measurements. Matching those details correctly is the safest way to select the right component for the job.

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 NXA9304 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, Power Rating (Amp) 225, Shaft Diameter 22mm, Voltage 24, Alternator Mount Pad, Product Group 2 ALTERNATORS, Part No. NXA9304.

Additional published details for cross-checking include Brand NIEHOFF, Description Niehoff Alternator 24V 225A, Mount Leg Thickness 100mm, Regulator Type External, Suits Unit Make Niehoff, Note A2-357 Regulator included, New / Reman. New, Product Group 1 ROTATING ELECTRICAL.

Niehoff Alternator 24V 225A. Part number NXA9304 should be checked first. Listed voltage is 24. Listed output rating is 225. These details form the core reference points used by parts interpreters when confirming the correct replacement.

Mount style is Pad. Regulator type is External. Those physical and electrical details should line up with the original unit before the replacement is approved for fitment.

For part number NXA9304, 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.

Compatibility note: Please confirm fitment by checking the original part number, the 24V/225A charging specification, external regulator requirement, pad mount style, 22mm shaft diameter, and 100mm mount leg thickness before ordering.

FAQ

What is the part number for this alternator?

The listed part number is NXA9304. For this listing, part number NXA9304 is the main reference point. Listed voltage is 24. Listed output rating is 225. These details should still be checked against the original unit before ordering.

What voltage and output rating does it have?

It is a 24V alternator rated at 225A. For this listing, part number NXA9304 is the main reference point. Listed voltage is 24. Listed output rating is 225. These details should still be checked against the original unit before ordering.

Does it use an internal or external regulator?

It uses an external regulator, and the A2-357 regulator is included. For this listing, part number NXA9304 is the main reference point. Listed voltage is 24. Listed output rating is 225. 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 NXA9304 is the main reference point. Listed voltage is 24. Listed output rating is 225. These details should still be checked against the original unit before ordering.

What mounting style is listed?

The alternator mount is listed as pad. For this listing, part number NXA9304 is the main reference point. Listed voltage is 24. Listed output rating is 225. These details should still be checked against the original unit before ordering.

What dimensions should I check before buying?

Check the 22mm shaft diameter and 100mm mount leg thickness, along with the part number and regulator type. For this listing, part number NXA9304 is the main reference point. Listed voltage is 24. Listed output rating is 225. These details should still be checked against the original unit before ordering.