Bosch Alternator 12V 120A BXH1253A

The Bosch Alternator 12V 120A is a new rotating electrical unit supplied as each, with part number BXH1253A. It is a 12 volt alternator rated at 120 amps, with an internal regulator and a 4 groove pulley, making it a practical replacement for applications that match the listed mounting and drive details.

Key physical measurements on this unit include 32mm inside mounting legs, a 10.5 pivot hole diameter, 184mm mount centre to centre, and an M8 x 1.25 adjusting hole diameter. The pulley outside diameter is 67mm, and the alternator uses a twin leg mount. Weight is listed at 7.04kg, which is useful to compare against the existing unit during identification.

This Bosch alternator is described as suitable for Holden HSV with VM 5.0L engine, and the fitment data also references a wider range of Ford, Holden, and HSV applications. Because alternator fitment can vary by bracket style, pulley, regulator setup, and engine variant, the part number and mounting measurements should be checked carefully before purchase.

The unit is supplied with a one year warranty and is listed as new. For buyers replacing an existing Bosch alternator or comparing electrical output on a vehicle with similar mounting points, the 120 amp output, internal regulator, and 4 groove pulley are the key identifiers to confirm first.

Key Features

• Bosch alternator, new unit
• 12V, 120A output
• Internal regulator
• 4 groove pulley
• Twin leg mount
• Part number BXH1253A

Specifications

• Brand: Bosch
• Product type: Alternator
• Voltage: 12V
• Power rating: 120A
• Part number: BXH1253A
• Pin code: IR110
• Regulator type: Internal
• Pulley section: 4 groove

Fitment information supplied

• To suit Holden HSV with VM 5.0L engine
• Fitment data also references Ford Cortina applications
• Fitment data also references Holden Calais and Holden Commodore applications
• Fitment data also references HSV Clubsport, HSV GTS, HSV LS, HSV Maloo, HSV Manta, HSV Senator, HSV SV99, and HSV XU8 applications
• Verify the existing alternator part number, pulley type, regulator type, and mounting measurements before ordering

Application and Buying Notes

When replacing an alternator, the safest match is the one that agrees with the part number, mounting layout, and electrical specification already on the vehicle. For this Bosch unit, the important checks are BXH1253A, 12V system voltage, 120A output, internal regulator, 4 groove pulley, and the twin leg mount with 184mm mount centre to centre.

The physical measurements matter just as much as the electrical rating. A 32mm inside mounting leg dimension, 10.5 pivot hole diameter, M8 x 1.25 adjusting hole, and 67mm pulley outside diameter all need to line up with the bracket and belt arrangement on the vehicle. If any of those details differ from the existing alternator, do not assume it will swap over without modification.

The listed fitment includes Holden HSV with VM 5.0L engine, plus a broader set of Ford, Holden, and HSV applications. That still does not remove the need to confirm the exact application, because alternators can change between model years, engine variants, and accessory drive setups. Use the current unit as the reference point if you are unsure.

This alternator is a new Bosch unit with a one year warranty and a listed weight of 7.04kg. Those details are useful for freight handling, comparison against the removed part, and confirming you are not looking at a remanufactured unit or a lighter aftermarket substitute with different build characteristics.

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 BXH1253A 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, Inside Mounting Legs 32mm, Pivot Hole Diameter 10.5, Pulley Outside Diameter 67mm, Regulator Type Internal, Voltage 12, Mount Cnt to Cnt 184mm, Weight 7.04kg.

Additional published details for cross-checking include Product Group 1 ROTATING ELECTRICAL, Part No. BXH1253A, Brand BOSCH, Description Bosch Alternator 12V 120A, Adjusting Hole Diameter M8 x 1.25, Pin Code IR110, Power Rating (Amp) 120, Pulley Section 4 Groove, Suits Unit Make Bosch, Alternator Mount Twin Leg.

Bosch Alternator 12V 120A. Part number BXH1253A 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 Twin Leg. Regulator type is Internal. Pulley configuration is 4 Groove. Those physical and electrical details should line up with the original unit before the replacement is approved for fitment.

Compatibility note: Confirm fitment by comparing part number BXH1253A, the 12V 120A specification, internal regulator, 4 groove pulley, and the listed mounting measurements against the vehicle already fitted. If the application, bracket style, or pulley arrangement differs, check before ordering.

FAQ

What is the part number for this Bosch alternator?

The part number listed is BXH1253A.

Is this alternator 12 volt and what is its output?

Yes. It is listed as 12V with a 120A power rating.

Does this alternator use an internal regulator?

Yes. The regulator type is listed as internal.

What pulley setup does this alternator have?

It has a 4 groove pulley with a 67mm outside diameter.

What fitment is specifically mentioned for this unit?

The listed fitment specifically mentions Holden HSV with VM 5.0L engine. The fitment data also references Ford, Holden, and HSV applications, including Ford Cortina, Holden Calais, Holden Commodore, HSV Clubsport, HSV GTS, HSV LS, HSV Maloo, HSV Manta, HSV Senator, HSV SV99, and HSV XU8.

What should I check before buying?

Check the part number BXH1253A, the 12V 120A output, internal regulator, 4 groove pulley, twin leg mount, and the listed mounting measurements: 32mm inside mounting legs, 10.5 pivot hole diameter, 184mm mount centre to centre, and M8 x 1.25 adjusting hole diameter.