Bosch Alternator 12V 55A 0124120001

The Bosch Alternator 12V 55A, part number 0124120001, is a new rotating electrical unit with an internal regulator and a 55 amp charge current. It is supplied as a twin leg alternator with a double pivot lever fastening type, and it is listed as an alternator type excluding vacuum pump.

Key dimensions matter with this unit: inside mounting legs are 67mm, the pivot hole diameter is 8.5mm, the adjusting hole diameter is M8x1.25, and the mount centre to centre measurement is 155mm. The pulley outside diameter is 67mm, with a double pulley and 2 grooves, and the pulley section is AA.

This Bosch unit is specified at 12V and 55A, with a weight of 3.54kg. It is sold each, carries a one year warranty, and is described as suitable for Bosch units. If you are replacing a charging component, matching the part number and the mounting measurements is the most reliable way to check suitability before ordering.

Key Features

• Bosch alternator, 12V 55A
• Part number 0124120001
• New unit, not remanufactured
• Internal regulator
• Twin leg mount with double pivot lever fastening
• Double pulley with 2 grooves

Specifications

• Voltage: 12V
• Charge current / power rating: 55A
• Inside mounting legs: 67mm
• Pivot hole diameter: 8.5mm
• Adjusting hole diameter: M8x1.25
• Mount centre to centre: 155mm
• Pulley outside diameter: 67mm
• Pulley section: AA

Application and Buying Notes

Before fitting, compare the Bosch part number 0124120001 with the unit you are replacing, then check the mounting layout against the listed measurements. The critical points here are the twin leg mount, 67mm inside mounting legs, 8.5mm pivot hole, M8x1.25 adjusting hole, and 155mm mount centre to centre.

The alternator is rated at 12V and 55A, so it should only be considered where that charging specification suits the vehicle and charging system arrangement. The unit is listed as excluding vacuum pump, which is an important detail when matching like for like in the engine bay.

The pulley details also need attention. This unit has a double pulley, 2 grooves, a 67mm outside diameter, and AA pulley section. If the existing belt drive arrangement does not match those details, the alternator may not be an exact replacement even if the housing appears similar.

Recommended additional repairs include V-Belt/V-Ribbed Belt. When replacing an alternator, it is sensible to inspect the belt condition, belt alignment, and the related drive components at the same time, especially where wear has already affected charging performance or belt noise.

Because this is a new Bosch alternator with an internal regulator, the electrical setup should be checked carefully before purchase. Confirm the system requirements, connector arrangement, and physical clearances in the vehicle so the replacement can be matched properly rather than assumed from appearance alone.

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 0124120001 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 67mm, Pivot Hole Diameter 8.5, Pulley Outside Diameter 67mm, Regulator Type Internal, Voltage 12, Mount Cnt to Cnt 155mm, Alternator Charge Current [A] 55.

Additional published details for cross-checking include Pulleys with double pulley, Number of grooves 2, Packaging length 28, Packaging height 22.5, Weight 3.54kg, Product Group 1 ROTATING ELECTRICAL, Part No. 0124120001, Brand BOSCH, Description Bosch Alternator 12V 55A, Adjusting Hole Diameter M8x1.25.

Bosch Alternator 12V 55A. Part number 0124120001 should be checked first. Listed voltage is 12. Listed output rating is 55. 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 AA. Those physical and electrical details should line up with the original unit before the replacement is approved for fitment.

For part number 0124120001, 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 55 should be checked carefully. Incorrect selection can affect installation time, return freight, and equipment availability.

Where no verified application list is available, the part number, mounting details, connector style, and published specifications should be used as the primary selection criteria.

In the absence of a verified fitment list, the safest approach is to compare the removed unit directly with the listed product details. That includes checking the housing style, pulley layout, regulator arrangement, and any visible identification numbers before supply is approved.

Compatibility note: Confirm fitment using Bosch part number 0124120001 and the listed mounting, pulley, and voltage details before purchase. If any measurement, pulley arrangement, or regulator arrangement differs from the unit being replaced, the part should be checked again against the vehicle application.

FAQ

Is this alternator new or remanufactured?

It is listed as new, not remanufactured.

What is the voltage and charge current?

The alternator is specified at 12V with a 55A charge current and 55A power rating.

Does it have an internal regulator?

Yes. The regulator type is listed as internal.

What mounting measurements should I check?

Check the 67mm inside mounting legs, 8.5mm pivot hole diameter, M8x1.25 adjusting hole diameter, and 155mm mount centre to centre.

What pulley details are listed?

It has a double pulley, 2 grooves, a 67mm pulley outside diameter, and AA pulley section.

What should I verify before ordering?

Confirm Bosch part number 0124120001, the 12V 55A rating, the twin leg mount, and the pulley and mounting measurements against the unit being replaced.