Bosch Alternator 12V 150A 1986A00947

The Bosch alternator listed here is a 12V, 150A unit identified by part number 1986A00947. It is an alternator type excluding vacuum pump, with an internal regulator, single leg mount, and three-point mounting arrangement. Those details matter when matching the unit to the vehicle and checking the mounting layout before purchase.

This unit has a 77mm pulley outside diameter, a 9 groove pulley section, a 10mm pivot hole diameter, and a 12mm adjusting hole diameter. The mounting leg thickness is 80mm. These are the kinds of dimensions that need to line up with the existing alternator setup, especially where belt alignment and bracket fit are involved.

Bosch lists this alternator as manufactured in Spain and supplied with a 12 month warranty. The unit weighs 8kg and is sold each. It is designed for use with a V-Belt or V-Ribbed Belt as a recommended additional repair item, so belt condition should be checked at the same time as the alternator installation.

Key Features

• 12V alternator with 150A charge current
• Bosch part number 1986A00947
• Internal regulator
• Single leg alternator mount
• Three-point mounting
• 9 groove pulley section

Specifications

• Brand: Bosch
• Product type: Alternator
• Voltage: 12V
• Power rating: 150A
• Alternator charge current: 150A
• Part No.: 1986A00947
• Regulator type: Internal
• Alternator mount: Single leg

Fitment guidance

• Fitment data supplied includes Mercedes-Benz Atego applications.
• The fitment listing also includes Mercedes-Benz Atego 2 applications.
• Mercedes-Benz is the only make shown in the supplied fitment data.
• Year references visible in the fitment preview include 1998, 1999, 2000, 2001, 2002, 2003, and 2004.
• Use the part number 1986A00947 and the mounting and pulley details to confirm the correct replacement.

Application and Buying Notes

Before ordering, confirm the alternator part number 1986A00947 against the old unit and check that the vehicle uses a 12V charging system with a 150A alternator. The internal regulator, single leg mount, and three-point mounting layout all need to match the existing installation, not just the electrical rating.

The pulley details are important on this Bosch unit. It has a 77mm outside diameter and a 9 groove pulley section, so belt alignment and belt style should be checked carefully. If the current belt is worn, the recommended additional repair item is a V-Belt or V-Ribbed Belt, which is worth inspecting at the same time.

Mounting dimensions should be checked before fitting. The alternator has an 80mm mount leg thickness, a 10mm pivot hole diameter, and a 12mm adjusting hole diameter. If these figures do not correspond with the vehicle bracket and adjustment arrangement, the alternator may not install correctly even if the electrical specification looks suitable.

This alternator is listed as excluding a vacuum pump, so it is important to compare the existing assembly rather than assuming interchange from appearance alone. The supplied fitment information points to Mercedes-Benz Atego and Atego 2 applications, but the correct match still needs to be confirmed by part number and the vehicle’s charging system details.

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 1986A00947 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 12 Months, Mount Leg Thickness 80mm, Pivot Hole Diameter 10, Pulley Outside Diameter 77mm, Regulator Type Internal, Alternator Mount Single Leg, Fastening Type Three-point mounting, Recommended additional repairs V-Belt/V-Ribbed Belt.

Additional published details for cross-checking include Packaging width 20, Manufactured in Spain, Product Group 2 ALTERNATORS, Part No. 1986A00947, Brand BOSCH, Description Bosch Alternator 12V 150A, Adjusting Hole Diameter 12, Pin Code IR139, Power Rating (Amp) 150.

Bosch Alternator 12V 150A. Part number 1986A00947 should be checked first. Listed voltage is 12. Listed output rating is 150. These details form the core reference points used by parts interpreters when confirming the correct replacement.

Mount style is Single Leg. Regulator type is Internal. Pulley configuration is 9 Groove. Those physical and electrical details should line up with the original unit before the replacement is approved for fitment.

For part number 1986A00947, 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 150 should be checked carefully. Incorrect selection can affect installation time, return freight, and equipment availability.

Available application references include MERCEDES-BENZ ATEGO, MERCEDES-BENZ ATEGO 1998, MERCEDES-BENZ ATEGO 1999, MERCEDES-BENZ ATEGO 2. 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 1986A00947, the 12V 150A rating, the internal regulator, the single leg three-point mounting, and the 77mm 9 groove pulley before purchase.

FAQ

What is the part number for this Bosch alternator?

The Bosch part number supplied is 1986A00947.

What voltage and output does this alternator have?

It is a 12V alternator with a 150A power rating and 150A charge current.

Does this alternator have an internal regulator?

Yes. The regulator type is listed as internal.

What pulley details are listed for this unit?

It has a 77mm pulley outside diameter and a 9 groove pulley section.

Which vehicles are shown in the fitment information?

The supplied fitment information includes Mercedes-Benz Atego and Mercedes-Benz Atego 2 applications, with year references including 1998 through 2004 in the previewed data.

What should I check before buying this alternator?

Check the part number 1986A00947, the 12V 150A rating, the internal regulator, the single leg three-point mounting, the 80mm mount leg thickness, and the 77mm 9 groove pulley to confirm it matches the vehicle’s existing setup.