Bosch Alternator 12V 140A 0124525525

This Bosch alternator is a 12V, 140A unit with part number 0124525525, supplied as a new alternator in each pack. It uses an internal regulator, a free-wheel belt pulley, and a 6 groove pulley section, so matching the electrical and belt-drive details is just as important as matching the part number.

It is listed with a quad leg alternator mount, 127mm mount centre to centre, 60mm inside mounting legs, and a 56mm pulley outside diameter. Those measurements give a solid starting point when checking replacement suitability, especially on vehicles where mounting layout and pulley design must line up exactly.

The alternator is manufactured in Spain and carries a one year warranty. Bosch notes the unit is to suit Audi A3 with AXW engine, and the fitment data also shows a wider group of Audi, Skoda and Volkswagen applications, so verification against the specific vehicle details remains essential before ordering.

Key Features

• 12V alternator rated at 140A
• Bosch part number 0124525525
• Internal regulator design
• Free-wheel belt pulley fitted
• 6 groove pulley section
• New unit, supplied each

Specifications

• Voltage: 12V
• Charge current / power rating: 140A
• Part No.: 0124525525
• Pin code: IR139
• Pulley outside diameter: 56mm
• Pulley type: with free-wheel belt pulley
• Number of grooves: 6
• Alternator mount: Quad Leg

Confirmed fitment guidance

• To suit Audi A3 with AXW engine
• Fitment data also references Audi, Skoda and Volkswagen applications
• Listed application groups include Audi A1, Audi A3, Audi A4 and Audi TT
• Listed application groups include Skoda Octavia, Roomster, Superb and Yeti
• Listed application groups include Volkswagen Caddy, CC, Eos, Golf, Passat, Passat Alltrack, Polo, Scirocco and Tiguan

Application and Buying Notes

When replacing an alternator, the safest check is to match the part number 0124525525 first, then confirm the vehicle application and mounting details. This unit is a 12V, 140A Bosch alternator with an internal regulator, so it is important that the charging system requirements and connector arrangement suit the vehicle before installation.

The pulley and mounting details matter here. This alternator has a 6 groove, free-wheel belt pulley with a 56mm outside diameter, a 127mm mount centre to centre measurement, and 60mm inside mounting legs. If any of those dimensions differ from the existing unit, the alternator may not align correctly with the belt drive or bracket setup.

Bosch lists this alternator as suitable for Audi A3 with AXW engine, and the fitment data also shows broader Audi, Skoda and Volkswagen coverage. Even so, the exact vehicle specification should be checked carefully, because alternator fitment can vary by engine code, model year, mounting style and pulley arrangement.

The unit is noted as alternator type excl. vacuum pump, so it should only be compared against applications that use that configuration. The recommended additional repair is a V-Belt or V-Ribbed Belt, which is worth considering if the belt is worn, glazed or due for service at the same time as the alternator.

If you are matching by vehicle, have the VIN, engine code and the old alternator in front of you before ordering. That approach helps confirm the 12V electrical setup, the 140A output, the quad leg mount and the pulley style against the vehicle already on the hoist or in the workshop.

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 0124525525 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, Pin Code IR139, Pulley Outside Diameter 56mm, Regulator Type Internal, Voltage 12, Mount Cnt to Cnt 127mm, Alternator Charge Current [A] 140, Pulleys with free-wheel belt pulley.

Additional published details for cross-checking include Number of grooves 6, Packaging length 24, Packaging height 18.5, Product Group 2 ALTERNATORS, Part No. 0124525525, Brand BOSCH, Description Bosch Alternator 12V 140A, Inside Mounting Legs 60mm, Power Rating (Amp) 140.

Bosch Alternator 12V 140A. Part number 0124525525 should be checked first. Listed voltage is 12. Listed output rating is 140. These details form the core reference points used by parts interpreters when confirming the correct replacement.

Mount style is Quad Leg. Regulator type is Internal. Pulley configuration is 6 Groove. Those physical and electrical details should line up with the original unit before the replacement is approved for fitment.

For part number 0124525525, 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 140 should be checked carefully. Incorrect selection can affect installation time, return freight, and equipment availability.

Available application references include AUDI A1, AUDI A1 2011, AUDI A1 2012, AUDI A1 2013, SKODA OCTAVIA, SKODA OCTAVIA 2004. 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: Please confirm compatibility by checking part number 0124525525, the 12V 140A specification, the quad leg mount, and the listed application details against the vehicle before purchase.

FAQ

What is the part number for this Bosch alternator?

The part number is 0124525525.

What voltage and output does this alternator have?

It is a 12V alternator rated at 140A.

Does this alternator have an internal regulator?

Yes. The listed regulator type is internal.

What pulley setup does it use?

It uses a free-wheel belt pulley with a 6 groove pulley section and a 56mm pulley outside diameter.

Which vehicle is specifically mentioned in the product facts?

Bosch lists it to suit Audi A3 with AXW engine.

Is this a new or remanufactured alternator?

It is listed as new.