Bosch Alternator 12V 120A 1986A00854

The Bosch Alternator 12V 120A, part number 1986A00854, is a new rotating electrical unit supplied as an each item for 12-volt applications. It carries a 120 amp power rating, an internal regulator, and a single leg alternator mount, making the key matching points easy to confirm before purchase.

Important dimensions for checking installation include a 56mm mount leg thickness, 156mm mount centre-to-centre, a 10mm pivot hole diameter, a 10mm adjusting hole diameter, and a 17mm shaft diameter. The pulley section is not applicable on this unit, so the mounting and drive details need to be checked against the vehicle’s existing alternator rather than assumed.

This Bosch unit is listed as new, weighs 6.2kg, and is covered by a 12 month warranty. The product group is rotating electrical / alternators, and the pin code is IR189, which can be useful when cross-checking cataloguing and parts interpretation before ordering.

Key Features

• Bosch alternator, 12V 120A
• New unit, not remanufactured
• Internal regulator type
• Single leg alternator mount
• Part number 1986A00854
• Pin code IR189

Specifications

• Voltage: 12V
• Power rating: 120A
• Type: Alternator
• Brand: Bosch
• Part No.: 1986A00854
• Regulator type: Internal
• Alternator mount: Single leg
• Mount leg thickness: 56mm

Application and Buying Notes

Before ordering, match the part number 1986A00854 wherever possible, then compare the physical mounting details on the existing unit. The important checks here are the single leg mount, 56mm mount leg thickness, 156mm mount centre-to-centre, 10mm pivot hole diameter, 10mm adjusting hole diameter, and 17mm shaft diameter.

This alternator is rated at 12V and 120A with an internal regulator, so the electrical specification needs to suit the vehicle system as well as the mounting pattern. A close match in shape is not enough on its own if the regulator type, shaft size, or mount measurements differ from the original.

The pulley section is marked not applicable, so the drive arrangement should be confirmed against the vehicle’s existing alternator before fitting. That is especially important when replacing a unit that may look similar but use different mounting or drive details.

If you are unsure, compare the old alternator and the vehicle application details against the Bosch part number, pin code IR189, and the listed measurements. Taking a few minutes to confirm these details is the most reliable way to avoid ordering the wrong rotating electrical unit.

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 1986A00854 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, Pivot Hole Diameter 10, Pulley Section Not Applicable, Shaft Diameter 17mm, Voltage 12, Mount Cnt to Cnt 156mm, Weight 6.2kg.

Additional published details for cross-checking include Product Group 1 ROTATING ELECTRICAL, Part No. 1986A00854, Brand BOSCH, Description Bosch Alternator 12V 120A, Adjusting Hole Diameter 10, Pin Code IR189, Power Rating (Amp) 120, Regulator Type Internal, Suits Unit Make Bosch, Alternator Mount Single Leg.

Bosch Alternator 12V 120A. Part number 1986A00854 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.

Mount style is Single Leg. Regulator type is Internal. Pulley configuration is Not Applicable. Those physical and electrical details should line up with the original unit before the replacement is approved for fitment.

For part number 1986A00854, 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.

Compatibility note: Confirm compatibility by matching part number 1986A00854 and the listed mount, shaft, regulator, and voltage details against the vehicle’s existing alternator and application information before purchase.

FAQ

What type of product is this?

It is a Bosch alternator, supplied as a new 12V 120A rotating electrical unit. For this listing, part number 1986A00854 is the main reference point. Listed voltage is 12. Listed output rating is 120. These details should still be checked against the original unit before ordering.

What is the part number?

The part number is 1986A00854. For this listing, part number 1986A00854 is the main reference point. Listed voltage is 12. Listed output rating is 120. These details should still be checked against the original unit before ordering.

Does it have an internal regulator?

Yes. The listed regulator type is internal. For this listing, part number 1986A00854 is the main reference point. Listed voltage is 12. Listed output rating is 120. These details should still be checked against the original unit before ordering.

What mounting details are listed?

The alternator has a single leg mount, 56mm mount leg thickness, 156mm mount centre-to-centre, a 10mm pivot hole diameter, and a 10mm adjusting hole diameter. For this listing, part number 1986A00854 is the main reference point. Listed voltage is 12. Listed output rating is 120. These details should still be checked against the original unit before ordering.

What shaft size is listed?

The shaft diameter is listed as 17mm. For this listing, part number 1986A00854 is the main reference point. Listed voltage is 12. Listed output rating is 120. These details should still be checked against the original unit before ordering.

Is fitment confirmed for a specific vehicle?

No specific vehicle fitment is provided here, so compatibility should be confirmed using part number 1986A00854 and the listed measurements and electrical details. For this listing, part number 1986A00854 is the main reference point. Listed voltage is 12. Listed output rating is 120. These details should still be checked against the original unit before ordering.