Bosch Alternator 12V 120A Part No. 1986A00850

The Bosch Alternator 12V 120A is a rotating electrical component supplied as an each unit, with part number 1986A00850 and a 12 month warranty. It is listed as an alternator type excl. vacuum pump, with a charge current of 120A and a double pivot lever fastening type.

This alternator is described as Bosch 12V 120A and is manufactured in China. It sits in the rotating electrical category and is intended for buyers who are matching the alternator by electrical specification, mounting style and part number rather than by appearance alone.

The unit is built from high quality raw materials to support long life and consistent operation. As with any alternator replacement, correct identification matters, especially where the application specifies the alternator type, mounting arrangement and whether the unit is the excl. vacuum pump version.

Key Features

• Bosch alternator, 12V system
• 120A charge current
• Part No. 1986A00850
• Alternator type: excl. vacuum pump
• Fastening type: double pivot lever
• 12 month warranty

Specifications

• Brand: Bosch
• Product type: Alternator
• Voltage: 12V
• Charge current: 120A
• Part number: 1986A00850
• Alternator type: excl. vacuum pump
• Fastening type: double pivot lever
• Warranty: 12 months

Known fitment applications

• Alfa Romeo 147
• Alfa Romeo 147 2003 to 2010
• Alfa Romeo 156
• Alfa Romeo 156 2000 to 2001
• Alfa Romeo 166
• Alfa Romeo GT
• Alfa Romeo GTV
• Alfa Romeo Spider

Application and Buying Notes

Before ordering, check the alternator part number 1986A00850 and confirm the unit is the 12V 120A version. The alternator is listed as excl. vacuum pump, so that detail needs to match the vehicle application exactly if the original unit includes, or is designed around, a vacuum pump arrangement.

The mounting style is identified as double pivot lever fastening type. That matters because alternators can share similar electrical ratings while differing in bracket configuration, pulley arrangement and overall fit. Matching the physical mounting details is just as important as matching the 12V and 120A specifications.

If you are replacing a charging system component, it is sensible to check the V-belt or V-ribbed belt at the same time. The belt condition can affect charging performance and noise, and the alternator listing specifically recommends that additional repair. It is also worth confirming the battery condition and charging circuit once installation is complete.

Fitment information is provided for several Alfa Romeo applications, including 147, 156, 166, GT, GTV and Spider variants. Even where the model name appears familiar, confirm the exact application against the vehicle details, part number and the alternator description before purchase. Small differences in year, engine setup or accessory drive can change compatibility.

The packaging size of 23.9 x 20 x 20 may be useful for workshop planning, but it should not be used as a fitment guide. The practical checks are the part number, the 12V 120A rating, the excl. vacuum pump note and the mounting type. Those details give the clearest indication of whether this alternator is the correct replacement.

This Bosch alternator is sold as a single unit and carries a 12 month warranty. That gives a clear baseline for replacement planning, but it remains important to verify the vehicle’s original charging system specification before fitting. A parts interpreter would always confirm the alternator type, mounting style and application notes rather than relying on model name 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 1986A00850 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, Fastening Type Double Pivot Lever, Recommended additional repairs V-Belt/V-Ribbed Belt, Packaging width 20, Manufactured in China, Product Group 1 ROTATING ELECTRICAL, Part No. 1986A00850, Brand BOSCH.

Additional published details for cross-checking include Description Bosch Alternator 12V 120A, Alternator Charge Current [A] 120, Alternator Type excl. vacuum pump, Packaging length 23.9, Packaging height 20, Product Group 2 ALTERNATORS.

Bosch Alternator 12V 120A. Part number 1986A00850 should be checked first. Listed output rating is 120. These details form the core reference points used by parts interpreters when confirming the correct replacement.

For part number 1986A00850, 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 output 120 should be checked carefully. Incorrect selection can affect installation time, return freight, and equipment availability.

Available application references include ALFA ROMEO 147, ALFA ROMEO 147 2003, ALFA ROMEO 147 2004, ALFA ROMEO 147 2005. 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 fitment by matching part number 1986A00850, 12V 120A output, excl. vacuum pump specification and double pivot lever mounting against the vehicle application before ordering.

FAQ

What is the part number for this alternator?

The part number listed is 1986A00850.

What voltage and output does this alternator have?

It is a 12V alternator with a 120A charge current.

Does this alternator include a vacuum pump?

No. It is listed as alternator type excl. vacuum pump.

What is the mounting style?

The fastening type is listed as double pivot lever.

What vehicles are shown in the fitment data?

The fitment data lists Alfa Romeo 147, 156, 166, GT, GTV and Spider applications, with Alfa Romeo 147 years shown from 2003 to 2010.

Is any additional repair recommended during replacement?

Yes. A V-belt or V-ribbed belt is listed as a recommended additional repair.