Bosch Alternator 12V 180A 1986A00965

This Bosch alternator is a 12V, 180A unit with part number 1986A00965. It is listed as an alternator type excl. vacuum pump, with an internal regulator and a single leg alternator mount, so the mounting style and electrical setup need to match the vehicle before purchase.

The pulley is a 6 groove design with a 50mm outside diameter, and the mounting dimensions shown are 56mm mount leg thickness, 156mm mount centre to centre, and 11mm adjusting hole diameter. These are the key measurements to compare against the existing alternator and bracket layout.

Bosch lists this unit with a 12 month warranty and a charge current of 180A. It is manufactured in China and identified as part of Bosch’s rotating electrical range, so it is intended for vehicles that require a high output 12V charging system with the listed fitment profile.

Key Features

• 12V alternator with 180A output
• Internal regulator
• 6 groove pulley
• Single leg alternator mount
• Alternator type excl. vacuum pump
• 12 month warranty

Specifications

• Part No.: 1986A00965
• Brand: Bosch
• Power Rating (Amp): 180
• Alternator Charge Current [A]: 180
• Voltage: 12
• Regulator Type: Internal
• Fastening Type: Single pivoted lever
• Alternator Mount: Single Leg

Confirmed fitment groups

• MERCEDES-BENZ
• MERCEDES-BENZ CLS
• MERCEDES-BENZ E-CLASS
• MERCEDES-BENZ G-CLASS
• MERCEDES-BENZ M-CLASS
• MERCEDES-BENZ R-CLASS
• MERCEDES-BENZ S-CLASS
• MERCEDES-BENZ SL

Application and Buying Notes

Before ordering, check the part number 1986A00965, because alternators can look similar while differing in pulley section, regulator type, and mounting points. This unit uses a 6 groove pulley, internal regulator, and single leg mount, so those details should line up with the vehicle already fitted.

The listed dimensions are especially important: 56mm mount leg thickness, 156mm mount centre to centre, and an 11mm adjusting hole diameter. If any of those measurements differ from the existing unit or bracket arrangement, fitment may not be correct even if the vehicle appears in the supported group.

This alternator is rated at 180A and 12V, so it suits applications that require the same output and electrical configuration. Do not rely on the vehicle badge alone; compare the part number, mount style, pulley section, and alternator type excl. vacuum pump to the original component.

Bosch notes recommended additional repairs as V-Belt/V-Ribbed Belt. When replacing an alternator, it is sensible to inspect the belt condition and related drive components at the same time, especially where wear has already affected charging performance or belt tracking.

If the vehicle uses a different pulley layout, a vacuum pump arrangement, or a different regulator style, this part should not be assumed to be interchangeable. The safest approach is to confirm the old alternator details and match them against the listed specifications before finalising the order.

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 1986A00965 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 56mm, Power Rating (Amp) 180, Pulley Section 6 Groove, Voltage 12, Mount Cnt to Cnt 156mm, Fastening Type Single pivoted lever, Recommended additional repairs V-Belt/V-Ribbed Belt.

Additional published details for cross-checking include Packaging width 22.5, Manufactured in China, Product Group 1 ROTATING ELECTRICAL, Part No. 1986A00965, Brand BOSCH, Description Bosch Alternator 12V 180A, Adjusting Hole Diameter 11, Pin Code IR123, Pulley Outside Diameter 50mm, Regulator Type Internal.

Bosch Alternator 12V 180A. Part number 1986A00965 should be checked first. Listed voltage is 12. Listed output rating is 180. 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 1986A00965, 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: Please confirm fitment by checking part number 1986A00965, the 12V 180A rating, the 6 groove pulley, and the single leg mounting dimensions against the vehicle and the original alternator before buying.

FAQ

What is the part number for this Bosch alternator?

The part number listed is 1986A00965. For this listing, part number 1986A00965 is the main reference point. Listed voltage is 12. Listed output rating is 180. Published fitment references include MERCEDES-BENZ CLS, MERCEDES-BENZ CLS 2005, MERCEDES-BENZ CLS 2006. These details should still be checked against the original unit before ordering.

What voltage and output does it have?

It is a 12V alternator with a 180A power rating and 180A charge current. For this listing, part number 1986A00965 is the main reference point. Listed voltage is 12. Listed output rating is 180. Published fitment references include MERCEDES-BENZ CLS, MERCEDES-BENZ CLS 2005, MERCEDES-BENZ CLS 2006. These details should still be checked against the original unit before ordering.

Does it have an internal or external regulator?

This alternator is listed with an internal regulator. For this listing, part number 1986A00965 is the main reference point. Listed voltage is 12. Listed output rating is 180. Published fitment references include MERCEDES-BENZ CLS, MERCEDES-BENZ CLS 2005, MERCEDES-BENZ CLS 2006. These details should still be checked against the original unit before ordering.

What pulley setup does it use?

It uses a 6 groove pulley with a 50mm outside diameter. For this listing, part number 1986A00965 is the main reference point. Listed voltage is 12. Listed output rating is 180. Published fitment references include MERCEDES-BENZ CLS, MERCEDES-BENZ CLS 2005, MERCEDES-BENZ CLS 2006. These details should still be checked against the original unit before ordering.

What mounting details should be checked?

Check the single leg mount, 56mm mount leg thickness, 156mm mount centre to centre, and 11mm adjusting hole diameter against the existing unit. For this listing, part number 1986A00965 is the main reference point. Listed voltage is 12. Listed output rating is 180. Published fitment references include MERCEDES-BENZ CLS, MERCEDES-BENZ CLS 2005, MERCEDES-BENZ CLS 2006. These details should still be checked against the original unit before ordering.

Which vehicles are listed in the fitment group?

The fitment group includes MERCEDES-BENZ and the supported model groups shown as CLS, E-CLASS, G-CLASS, M-CLASS, R-CLASS, S-CLASS, and SL. For this listing, part number 1986A00965 is the main reference point. Listed voltage is 12. Listed output rating is 180. Published fitment references include MERCEDES-BENZ CLS, MERCEDES-BENZ CLS 2005, MERCEDES-BENZ CLS 2006. These details should still be checked against the original unit before ordering.