Bosch Alternator 24V 120A Part No. 1986A00974

This Bosch alternator is a new 24V, 120A unit with part number 1986A00974. It uses an internal regulator, has a clockwise rotation, and is listed as an alternator type excluding vacuum pump applications. For buyers matching an existing unit, the key identifiers here are 24 volts, 120 amps, single leg alternator mount, and three-point mounting.

It is manufactured in Spain and supplied as each, with a 12 month warranty. The mounting dimensions shown are 80mm mount leg thickness, 159mm mount centre to centre, and a 12mm adjusting hole diameter. The shaft diameter is 17mm and the pulley section is not applicable.

The unit is described as having contained non-recycled copper for fewer impurities and greater performance, along with corrosion resistance for harsh conditions. Those are useful points for commercial vehicles working in demanding environments, but the practical check remains the same: confirm the part number, voltage, amperage, mounting style, and physical dimensions before ordering.

Key Features

• 24V, 120A alternator
• Bosch brand, new unit
• Internal regulator
• Clockwise rotation
• Single leg mount with three-point fastening
• Excludes vacuum pump type

Specifications

• Part No.: 1986A00974
• Voltage: 24V
• Power rating / charge current: 120A
• Mount leg thickness: 80mm
• Mount centre to centre: 159mm
• Adjusting hole diameter: 12mm
• Shaft diameter: 17mm
• Rotation: CW

Verified fitment references

• M.A.N. D2676
• M.A.N. D2676 2008
• MAN 12.24#
• MAN 12.24# 2007
• MAN 12.24# 2008
• MAN 12.24# 2009
• MAN 15.28#
• MAN 15.28# 2007

Application and Buying Notes

Before ordering, check the existing alternator tag and compare it against Bosch part number 1986A00974. The electrical specification is 24V at 120A, so the replacement needs to match the vehicle’s charging system requirements rather than simply looking similar in shape.

The mounting setup is important on this unit: single leg alternator mount, three-point mounting, 80mm mount leg thickness, 159mm mount centre to centre, and a 12mm adjusting hole. If any of those points differ from the original unit, the alternator may not line up correctly even if the plug or casing appears close.

This alternator is listed with an internal regulator and clockwise rotation. It also has a 17mm shaft diameter and is marked as excluding vacuum pump applications, so it should only be considered where those details match the vehicle’s original equipment.

Recommended additional repairs include the V-belt or V-ribbed belt. When replacing an alternator, it is sensible to inspect the belt condition, drive alignment, and any worn mounting hardware at the same time, because those items can affect charging performance and installation quality.

The fitment references supplied include a range of MAN applications, including MAN TGL, TGM, TGS, TGX, and several MAN bus and engine references. Those references are useful as a guide, but the safest approach is still to confirm the exact vehicle application against the part number and the dimensions listed here.

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 1986A00974 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 80mm, Power Rating (Amp) 120, Regulator Type Internal, Shaft Diameter 17mm, Voltage 24, Mount Cnt to Cnt 159mm, Alternator Charge Current [A] 120.

Additional published details for cross-checking include Alternator Type excl. vacuum pump, Packaging length 23.9, Packaging height 20, Product Group 2 ALTERNATORS, Part No. 1986A00974, Brand BOSCH, Description Bosch Alternator 24V 120A, Adjusting Hole Diameter 12, Pin Code IR98.

Bosch Alternator 24V 120A. Part number 1986A00974 should be checked first. Listed voltage is 24. 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 1986A00974, 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 24 and output 120 should be checked carefully. Incorrect selection can affect installation time, return freight, and equipment availability.

Available application references include M.A.N. D2676, M.A.N. D2676 2008, MAN 12.24#, MAN 12.24# 2007, MAN 12.24# 2008, MAN 12.24# 2009. 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 Bosch part number 1986A00974, 24V output, 120A rating, CW rotation, single leg three-point mounting, and the listed dimensions against the original alternator and vehicle application before purchase.

FAQ

What is the part number for this alternator?

The Bosch part number listed is 1986A00974.

What voltage and amperage is it rated at?

It is rated at 24V and 120A.

Does this alternator use an internal regulator?

Yes. The regulator type is listed as internal.

What mounting details should I check before buying?

Check the single leg mount, three-point mounting, 80mm mount leg thickness, 159mm mount centre to centre, and 12mm adjusting hole diameter.

Which vehicles are listed in the fitment references?

The fitment references include a range of MAN applications, including MAN TGL, TGM, TGS, TGX, MAN bus, and several MAN engine and chassis references such as D2676 and 12.24#.

Is any additional repair suggested when replacing this alternator?

Yes. Recommended additional repairs include the V-belt or V-ribbed belt.