Bosch Alternator 12V 120A 0124425112

This Bosch alternator is a new 12V unit with a 120A charge current, part number 0124425112. It is listed as an alternator type excl. vacuum pump, with direct fastening, pad mount, and an internal regulator.

The pulley setup is a 5 groove multi-belt pulley with a 57mm outside diameter and clockwise rotation. For the right install, those details matter as much as the electrical rating, because the belt style, pulley layout, and mounting arrangement all need to match the vehicle application.

It is made in Spain and carries a one year warranty. Bosch also lists it as corrosion resistant, built from high quality raw materials, and using a reduction drive designed to maintain continual speeds for easier starting.

Key Features

• New Bosch alternator
• 12V, 120A charge output
• 5 groove multi-belt pulley
• Clockwise rotation
• Internal regulator
• Direct fastening, pad mount

Specifications

• Brand: Bosch
• Part No.: 0124425112
• Product type: Alternator
• Voltage: 12V
• Charge current: 120A
• Rotation: CW
• Pulley section: 5 groove
• Pulley outside diameter: 57mm

Fitment guidance

• Fitment data is shown for Alfa Romeo 159, Brera, and Spider applications.
• Previewed application coverage includes Alfa Romeo 159 model years 2006 through 2011.
• Previewed application coverage includes Alfa Romeo Brera model years 2006 through 2009.
• Fitment should still be confirmed against the part number 0124425112, the 12V system, 120A rating, 5 groove pulley, direct fastening, and pad mount layout before ordering.

Application and Buying Notes

The safest way to buy this alternator is to compare the part number 0124425112 first, then check the practical match points: 12V system, 120A output, clockwise rotation, 5 groove pulley, pad mount, and direct fastening. Those details are the main cues for whether the unit suits the vehicle and accessories already fitted.

Because this alternator is listed as excl. vacuum pump, it should only be considered where that configuration matches the original unit. If the vehicle uses a different alternator style, pulley count, or mounting arrangement, the unit may not be suitable even if the Bosch brand and voltage seem close.

The pulley diameter is listed at 57mm and the pulley is described as a multi-belt type. That makes belt alignment and belt condition worth checking at the same time, especially since recommended additional repairs include V-Belt/V-Ribbed Belt replacement where needed.

Bosch lists this as a new alternator with an internal regulator and corrosion resistant construction. Those are useful fitment and service details, but they do not replace a direct application check. When in doubt, compare the old unit side-by-side with the listing details before fitting.

If you are matching an existing Bosch unit, the brand reference, part number, and pin code IR189 can help narrow the search. Even so, the final check should always be the complete specification set, because alternators can differ in mounting, pulley arrangement, and internal configuration.

For workshop or trade use, the packaging dimensions and one year warranty are practical points to note, but the important buying decision is still compatibility. A correct electrical rating alone is not enough if the alternator mount, pulley, or rotation does not align with the vehicle.

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 0124425112 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) 120, Pulley Section 5 Groove, Rotation CW, Voltage 12, New / Reman. New, Fastening Type Direct fastening, Alternator Type excl. vacuum pump.

Additional published details for cross-checking include Recommended additional repairs V-Belt/V-Ribbed Belt, Packaging width 22.5, Manufactured in Spain, Product Group 1 ROTATING ELECTRICAL, Part No. 0124425112, Brand BOSCH, Description Bosch Alternator 12V 120A, Pin Code IR189, Pulley Outside Diameter 57mm, Regulator Type Internal.

Bosch Alternator 12V 120A. Part number 0124425112 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 Pad. 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 0124425112, 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.

Available application references include ALFA ROMEO 159, ALFA ROMEO 159 2006, ALFA ROMEO 159 2007, ALFA ROMEO 159 2008. 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 Bosch part number 0124425112, the 12V 120A specification, and the listed mounting and pulley details before purchase. Do not rely on brand alone, and do not assume fitment without checking the vehicle application and the existing alternator configuration.

FAQ

What is the part number for this alternator?

The Bosch part number listed is 0124425112.

What voltage and output does it have?

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

Is this alternator new or remanufactured?

It is listed as new.

What pulley setup does it use?

It has a 5 groove multi-belt pulley with a 57mm outside diameter.

Does it have an internal regulator?

Yes. The regulator type is listed as internal.

Which vehicles are shown in the fitment data?

The provided fitment data shows Alfa Romeo 159, Brera, and Spider applications, with previewed model years for Alfa Romeo 159 from 2006 to 2011 and Alfa Romeo Brera from 2006 to 2009.