Bosch Alternator 12V 120A 0124425009

This Bosch alternator is a 12V, 120A unit identified by part number 0124425009 and supplied as a new alternator. It is listed as an alternator type excl. vacuum pump, with an internal regulator and a twin leg mount arrangement, so matching the application details matters as much as matching the electrical rating.

The unit uses a 5 groove multi-belt pulley and has a mount centre-to-centre measurement of 184mm, with inside mounting legs at 56mm and a pivot hole diameter of 10mm. The adjusting hole diameter is M8 x 1.25, which gives you several useful checks before ordering or comparing against the removed unit.

The stated application reference is Holden / Saab with Z18XE engine. That is the only fitment detail provided, so it should be treated as a specific application guide rather than a blanket fitment claim. If you are comparing against an existing alternator, the part number 0124425009, pulley style, and mount measurements are the best identifiers to confirm first.

Key Features

• 12V, 120A Bosch alternator
• Part number 0124425009
• New unit, not remanufactured
• Internal regulator
• 5 groove multi-belt pulley
• Twin leg mount

Specifications

• Brand: Bosch
• Product type: Alternator
• Voltage: 12V
• Charge current: 120A
• Power rating: 120A
• Part number: 0124425009
• Regulator type: Internal
• Alternator type: Excl. vacuum pump

Compatibility guidance

• Holden / Saab with Z18XE engine
• Listed application only
• Confirm against part number 0124425009 and the mount measurements before purchase

Application and Buying Notes

When replacing an alternator, the safest check is to compare the part number 0124425009 with the unit already fitted to the vehicle. The supplied application reference is Holden / Saab with Z18XE engine, but alternators can vary by mount style, pulley arrangement, and regulator type even within similar models.

This unit is a 12V, 120A Bosch alternator with an internal regulator and a 5 groove pulley. Those details matter because the charging output, pulley section, and physical mount all need to line up with the existing installation. The alternator is also listed as excl. vacuum pump, so that feature must match the vehicle’s current setup.

The mounting figures are practical checks for a parts comparison: 184mm mount centre-to-centre, 56mm inside mounting legs, 10mm pivot hole diameter, and M8 x 1.25 adjusting hole diameter. If any of those differ from the old unit, confirm the correct application before fitting. This is especially important when replacing a clutch style pulley unit, as the note states this alternator will replace the original clutch style pulley unit.

It is also worth checking related wear items while the charging system is apart. The listing recommends additional repairs to the V-belt or V-ribbed belt, which is sensible if the belt shows wear, glazing, cracking, or contamination. A new alternator will only perform properly if the belt condition and drive alignment are sound.

The unit is described as new and supplied with a one year warranty. That does not remove the need to verify fitment, but it does give you a clear specification point when comparing options. If your vehicle uses the same application, mounting style, and pulley setup, this Bosch unit gives you a defined replacement path without needing to guess at the hardware.

For workshop or DIY fitting, handle the alternator as a precision electrical component. Check the connectors, pulley alignment, and physical clearance before final tightening. The safest approach is always to confirm the alternator by part number first, then use the mount and pulley details to make sure the unit matches the vehicle’s charging system layout.

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 0124425009 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 56mm, Pivot Hole Diameter 10, Pulley Section 5 Groove, Suits Unit Make Bosch, Note Will replace original clutch style pulley unit, Mount Cnt to Cnt 184mm, Alternator Charge Current [A] 120.

Additional published details for cross-checking include Pulleys with multi-belt pulley, Number of grooves 5, Product Group 2 ALTERNATORS, Part No. 0124425009, Brand BOSCH, Description Bosch Alternator 12V 120A, Adjusting Hole Diameter M8 x 1.25, Pin Code IR189, Power Rating (Amp) 120.

Bosch Alternator 12V 120A. Part number 0124425009 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 5 Groove. Those physical and electrical details should line up with the original unit before the replacement is approved for fitment.

For part number 0124425009, 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 using Bosch part number 0124425009, the 12V 120A rating, the 5 groove pulley, and the listed mount measurements before ordering or fitting.

FAQ

What is the part number for this alternator?

The Bosch part number is 0124425009.

What voltage and output does it have?

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

Is this a new or remanufactured unit?

It is listed as a new alternator.

What vehicle application is provided?

The supplied application reference is Holden / Saab with Z18XE engine.

Does it use an internal regulator?

Yes. The regulator type is listed as internal.

What should I check before buying?

Confirm the part number 0124425009, the 5 groove pulley, the twin leg mount, and the listed measurements: 184mm mount centre-to-centre, 56mm inside mounting legs, 10mm pivot hole diameter, and M8 x 1.25 adjusting hole diameter.