Bosch Alternator 12V 150A 1986A00874

The Bosch Alternator 12V 150A is a rotating electrical component supplied as each unit, with part number 1986A00874 and a 12-month warranty. It is rated at 150 amps and uses a 12V internal regulator layout, so it is intended for applications where the charging system specification needs to match the vehicle exactly.

Key physical details include a twin-leg alternator mount, M10 mount hole diameter, 10.2 / M10 pivot hole diameter, 82mm inside mounting legs, and a 53mm pulley outside diameter. It also uses a 6 groove pulley section and clockwise rotation, which are important checks when comparing against the removed unit.

This Bosch alternator is identified with pin code IR139 and carries the brand’s own description as a 12V 150A alternator. The feature statement supplied with the part notes that it is made from high quality raw materials for long life and optimal performance, which is a useful reminder to compare the full specification set before ordering.

Because alternators need to match both electrical output and mounting layout, the safest approach is to verify the part number 1986A00874, voltage, amp rating, pulley style, and mounting measurements against the original unit already fitted to the vehicle.

Key Features

• 12V alternator rated at 150A
• Internal regulator type
• Twin leg alternator mount
• 6 groove pulley section
• Clockwise rotation
• Bosch part number 1986A00874

Specifications

• Brand: Bosch
• Product type: Alternator
• Voltage: 12V
• Power rating: 150A
• Part number: 1986A00874
• Warranty: 12 months
• Mount hole diameter: M10
• Pivot hole diameter: 10.2 / M10

Fitment details

• Porsche 911
• Porsche 911 2004
• Porsche 911 2005
• Porsche 911 2006
• Porsche 911 2007
• Porsche 911 2008
• Porsche Boxster
• Porsche Boxster 2004

Application and Buying Notes

Before ordering, match the removed alternator against the listed details: 12V system voltage, 150A output, internal regulator, twin leg mount, M10 mount hole, 10.2 / M10 pivot hole, 82mm inside mounting legs, and 53mm pulley diameter. These measurements are the practical checks that help confirm whether the part will sit and drive correctly in the vehicle.

The pulley setup also needs close attention. This unit is listed with a 6 groove pulley section and clockwise rotation, so the belt profile and rotation direction should be compared with the existing alternator. If either of those details differs from the original unit, the part may not be suitable even if the mounting points appear similar.

Part number verification is still the most reliable way to confirm the correct alternator. Use Bosch part number 1986A00874 and the vehicle application details together, rather than relying on appearance alone. Alternators can look alike while differing in regulator type, pulley section, or mounting dimensions.

If you are replacing a faulty charging unit, it is also worth checking the condition of the pulley, plug arrangement, and mounting hardware on the vehicle before installation. The supplied information identifies pin code IR139, but the vehicle connector and physical fit still need to align with the original setup.

When comparing options, keep the voltage and amperage in mind. A 12V, 150A alternator is a specific charging specification, so it should be selected to suit the vehicle’s original system requirements. Do not assume a higher output unit will be a direct substitute unless the application details confirm it.

The supplied warranty is 12 months, which provides a clear reference point for after-sales support, but it does not replace the need to verify fitment carefully. Matching the full specification is the best way to avoid installation delays and return issues.

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 1986A00874 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 Hole Diameter M10, Pivot Hole Diameter 10.2 / M10, Pulley Outside Diameter 53mm, Regulator Type Internal, Voltage 12, Product Group 2 ALTERNATORS.

Additional published details for cross-checking include Part No. 1986A00874, Brand BOSCH, Description Bosch Alternator 12V 150A, Inside Mounting Legs 82mm, Pin Code IR139, Power Rating (Amp) 150, Pulley Section 6 Groove, Rotation CW, Alternator Mount Twin Leg, Product Group 1 ROTATING ELECTRICAL.

Bosch Alternator 12V 150A. Part number 1986A00874 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 Twin 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 1986A00874, 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: Confirm fitment using Bosch part number 1986A00874, the 12V 150A specification, and the mounting and pulley measurements before purchase. Vehicle applications shown should be checked against the original alternator already fitted to the car.

FAQ

What is the part number for this alternator?

The Bosch part number is 1986A00874.

What voltage and output does this alternator have?

It is a 12V alternator rated at 150A.

What regulator type does it use?

It uses an internal regulator.

What pulley setup does it have?

It has a 53mm pulley outside diameter and a 6 groove pulley section, with clockwise rotation.

Which vehicles are listed in the fitment details?

The supplied fitment includes Porsche 911, Porsche Boxster, and Porsche Cayman applications, with sample model years shown for Porsche 911 and Porsche Boxster from 2004 to 2008.

What should I check before buying?

Check the part number 1986A00874, 12V 150A rating, twin leg mount, M10 mounting details, 82mm inside mounting legs, and 6 groove pulley section against the existing alternator.