Bosch Alternator 12V 120A Part No. 1986A00855

The Bosch Alternator 12V 120A is a rotating electrical component supplied as each unit, with Part No. 1986A00855 and a power rating of 120 amps. It is listed as an alternator type excl. vacuum pump, so it is important to match the vehicle application carefully before ordering, especially where the original unit includes a different mounting or accessory arrangement.

This alternator uses a single pivoted lever fastening type and is specified for 12 volt systems. The unit is supported by a 12 month warranty and weighs 6.95 kg, with packaging dimensions of 28 cm long, 22.5 cm wide and 22.5 cm high. Those details are useful when checking both fitment and handling requirements before installation.

Bosch lists the regulators as designed for the vehicle application, with premium quality bearings and non-recycled copper used in the construction. That does not replace a proper vehicle check, but it does help identify the intended application profile of the part. If you are replacing a worn alternator, the 120A output and physical mounting style should be matched against the original unit rather than assumed from model alone.

Key Features

• 12V alternator with 120A charge current
• Bosch Part No. 1986A00855
• Alternator type: excl. vacuum pump
• Single pivoted lever fastening type
• Premium quality bearings
• Non-recycled copper construction

Specifications

• Brand: Bosch
• Product type: Alternator
• Power rating: 120A
• Alternator charge current: 120A
• Voltage: 12V
• Unit of measure: Each
• Weight: 6.95 kg
• Packaging: 28 cm x 22.5 cm x 22.5 cm

Fitment information

• Mercedes-Benz
• Mercedes-Benz CLK
• Mercedes-Benz E-Class
• Mercedes-Benz Valente
• Mercedes-Benz Viano
• Mercedes-Benz Vito / Mixto

Application and Buying Notes

When replacing an alternator, the first checks should be the part number, the mounting style and the electrical rating. This Bosch unit is Part No. 1986A00855, rated at 12V and 120A, and uses a single pivoted lever fastening type. Those details need to line up with the vehicle’s original alternator before purchase, because a matching brand name alone does not confirm correct fitment.

The alternator is listed as excl. vacuum pump, which is a key detail on vehicles where the original unit may have different equipment attached. If the removed alternator has a vacuum pump arrangement, or a different bracket and pulley setup, this part should be checked carefully against the application before installation. The note to consider V-Belt or V-Ribbed Belt replacement is also worth factoring in if the drive belt is worn, glazed or due for service.

The listed fitment references include Mercedes-Benz, Mercedes-Benz CLK, Mercedes-Benz E-Class, Mercedes-Benz Valente, Mercedes-Benz Viano and Mercedes-Benz Vito / Mixto, with year references shown in the supplied fitment set for some CLK and E-Class applications. Use those references as a guide only, then confirm the exact vehicle details and the original alternator number to avoid ordering the wrong unit. Dimensions, weight and the absence of a vacuum pump are practical checks that can save time during installation.

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 1986A00855 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, Voltage 12, Fastening Type Single pivoted lever, Recommended additional repairs V-Belt/V-Ribbed Belt, Packaging width 22.5, Manufactured in China, Product Group 2 ALTERNATORS.

Additional published details for cross-checking include Part No. 1986A00855, Brand BOSCH, Description Bosch Alternator 12V 120A, Power Rating (Amp) 120, Alternator Charge Current [A] 120, Alternator Type excl. vacuum pump, Packaging length 28, Packaging height 22.5, Weight 6.95kg, Product Group 1 ROTATING ELECTRICAL.

Bosch Alternator 12V 120A. Part number 1986A00855 should be checked first. Listed voltage is 12. Listed output rating is 120. These details form the core reference points used by parts interpreters when confirming the correct replacement.

For part number 1986A00855, 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 120 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 1997, MERCEDES-BENZ CLK 1998, MERCEDES-BENZ CLK 1999. 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 No. 1986A00855, the 12V 120A rating, the single pivoted lever mounting style, and whether the original alternator is an excl. vacuum pump version before ordering.

FAQ

What is the part number for this Bosch alternator?

The part number supplied is 1986A00855. For this listing, part number 1986A00855 is the main reference point. Listed voltage is 12. Listed output rating is 120. Published fitment references include MERCEDES-BENZ CLK, MERCEDES-BENZ CLK 1997, MERCEDES-BENZ CLK 1998. These details should still be checked against the original unit before ordering.

What voltage and amperage is this alternator?

It is a 12V alternator with a 120A charge current and 120A power rating. For this listing, part number 1986A00855 is the main reference point. Listed voltage is 12. Listed output rating is 120. Published fitment references include MERCEDES-BENZ CLK, MERCEDES-BENZ CLK 1997, MERCEDES-BENZ CLK 1998. These details should still be checked against the original unit before ordering.

Does this alternator include a vacuum pump?

No. It is listed as an alternator type excl. vacuum pump. For this listing, part number 1986A00855 is the main reference point. Listed voltage is 12. Listed output rating is 120. Published fitment references include MERCEDES-BENZ CLK, MERCEDES-BENZ CLK 1997, MERCEDES-BENZ CLK 1998. These details should still be checked against the original unit before ordering.

What vehicles are listed in the fitment references?

The supplied fitment references include Mercedes-Benz, Mercedes-Benz CLK, Mercedes-Benz E-Class, Mercedes-Benz Valente, Mercedes-Benz Viano and Mercedes-Benz Vito / Mixto. For this listing, part number 1986A00855 is the main reference point. Listed voltage is 12. Listed output rating is 120. Published fitment references include MERCEDES-BENZ CLK, MERCEDES-BENZ CLK 1997, MERCEDES-BENZ CLK 1998. These details should still be checked against the original unit before ordering.

What mounting type does this alternator use?

It uses a single pivoted lever fastening type. For this listing, part number 1986A00855 is the main reference point. Listed voltage is 12. Listed output rating is 120. Published fitment references include MERCEDES-BENZ CLK, MERCEDES-BENZ CLK 1997, MERCEDES-BENZ CLK 1998. These details should still be checked against the original unit before ordering.

Should any other parts be checked when replacing it?

Yes. The supplied notes recommend checking the V-Belt or V-Ribbed Belt as an additional repair item. For this listing, part number 1986A00855 is the main reference point. Listed voltage is 12. Listed output rating is 120. Published fitment references include MERCEDES-BENZ CLK, MERCEDES-BENZ CLK 1997, MERCEDES-BENZ CLK 1998. These details should still be checked against the original unit before ordering.