Bosch Alternator 12V 90A 1986A00785

Bosch Alternator 12V 90A, part number 1986A00785, is a rotating electrical component supplied as a single unit. It is rated at 12 volts and 90 amps, with an internal regulator and a 6 groove pulley. The alternator is listed as an excl. vacuum pump type, so the application needs to match that style of unit.

This alternator uses a single leg mount with single pivoted lever fastening. The pulley outside diameter is 56 mm and the rotation is clockwise. Those details matter when matching the part to the vehicle, because mounting style, pulley layout and rotation direction all need to line up with the original arrangement.

For servicing, it is worth noting the recommendation for additional repairs is a V-Belt/V-Ribbed Belt. If the belt condition is poor, or the existing drive components show wear, it makes sense to inspect them while the alternator is being replaced. The unit is manufactured in China and carries a 12 month warranty.

Key Features

• 12V alternator rated at 90A
• Internal regulator
• 6 groove pulley
• Clockwise rotation
• Single leg mount
• Excludes vacuum pump

Specifications

• Brand: Bosch
• Part No.: 1986A00785
• Voltage: 12V
• Charge current: 90A
• Alternator type: excl. vacuum pump
• Pulley section: 6 groove
• Pulley outside diameter: 56 mm
• Rotation: CW

Fitment guidance

• Fitment data references MERCEDES-BENZ applications, including CLK and E-CLASS ranges.
• Sample applications supplied include MERCEDES-BENZ CLK 2000, CLK 2001, CLK 2002, and E-CLASS 2000, E-CLASS 2001, E-CLASS 2002, E-CLASS 2003.
• Use the part number 1986A00785, together with the alternator type, mount style, pulley details and rotation, to confirm the correct application before ordering.
• Do not rely on model name alone, as alternator variants can differ within the same vehicle range.

Application and Buying Notes

Before ordering, compare the part number 1986A00785 with the unit already fitted to the vehicle. The key checks here are 12V voltage, 90A output, 6 groove pulley, 56 mm pulley outside diameter, clockwise rotation, single leg mount and single pivoted lever fastening.

The alternator is listed as an excl. vacuum pump type, which is an important distinction when matching replacement parts. If the existing alternator includes a vacuum pump or uses a different bracket arrangement, this unit is not the same specification and should not be assumed to fit.

The supplied fitment references point to MERCEDES-BENZ CLK and E-CLASS applications, but the safe way to buy is to match the part number and the physical details against the old unit. Where belt wear is present, the recommendation for V-Belt/V-Ribbed Belt repairs should also be considered during the job.

A 12 month warranty is supplied, but warranty is not a substitute for confirming compatibility. Take time to check connector style, mounting points, pulley groove count and rotation direction before fitting, especially when replacing a charging system component on a vehicle with multiple alternator variants.

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 1986A00785 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, Power Rating (Amp) 90, Pulley Section 6 Groove, Rotation CW, Alternator Mount Single Leg, Fastening Type Single pivoted lever, Recommended additional repairs V-Belt/V-Ribbed Belt, Packaging width 18.5.

Additional published details for cross-checking include Manufactured in China, Product Group 1 ROTATING ELECTRICAL, Part No. 1986A00785, Brand BOSCH, Description Bosch Alternator 12V 90A, Pin Code IR123, Pulley Outside Diameter 56mm, Regulator Type Internal, Voltage 12, Alternator Charge Current [A] 90.

Bosch Alternator 12V 90A. Part number 1986A00785 should be checked first. Listed voltage is 12. Listed output rating is 90. 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 6 Groove. Those physical and electrical details should line up with the original unit before the replacement is approved for fitment.

For part number 1986A00785, 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 90 should be checked carefully. Incorrect selection can affect installation time, return freight, and equipment availability.

Available application references include MERCEDES-BENZ CLK, MERCEDES-BENZ CLK 2000, MERCEDES-BENZ CLK 2001, MERCEDES-BENZ CLK 2002. 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.

The listed warranty is 12 Months. Warranty terms should be considered alongside correct application and part identification, as warranty does not replace fitment confirmation.

Compatibility note: Confirm fitment by matching part number 1986A00785 and the listed application details, including 12V, 90A, 6 groove pulley, 56 mm pulley outside diameter, CW rotation, single leg mount and excl. vacuum pump configuration.

FAQ

What is the part number for this Bosch alternator?

The part number is 1986A00785.

What are the main electrical ratings?

It is a 12V alternator with a 90A charge current rating.

Does this alternator have an internal regulator?

Yes. The regulator type is listed as internal.

What pulley setup does it use?

It has a 6 groove pulley with a 56 mm outside diameter.

What mount type is listed?

The alternator mount is single leg, with single pivoted lever fastening.

Which vehicle ranges are referenced in the fitment data?

The fitment references supplied point to MERCEDES-BENZ applications, including CLK and E-CLASS ranges, with sample applications such as CLK 2000 to CLK 2002 and E-CLASS 2000 to E-CLASS 2003.