Bosch Alternator 12V 120A 1986A00819

The Bosch Alternator 12V 120A, part number 1986A00819, is a 12-volt alternator rated at 120 amps and supplied as an each unit. It uses an internal regulator, a 5 groove pulley, and a twin leg alternator mount, so it is important to compare the physical mounting points and pulley setup before ordering.

This alternator is listed to suit Holden / Saab applications with the Z18XE engine. The mounting dimensions provided include 56mm inside mounting legs, a 184mm mount centre-to-centre measurement, a 10mm pivot hole diameter, and an M8 x 1.25 adjusting hole, all of which are useful checks when matching the replacement unit to the existing installation.

A further application note advises that it will replace the original clutch style pulley unit. That detail matters when the original alternator uses a clutch pulley arrangement, because pulley style and groove count need to match the belt system on the vehicle. Confirm the part number 1986A00819 and compare the physical details before fitting.

Key Features

• Bosch alternator, 12V and 120A
• Part number 1986A00819
• Internal regulator
• 5 groove pulley
• Twin leg alternator mount
• To suit Holden / Saab with Z18XE engine

Specifications

• Voltage: 12V
• Power rating: 120 amps
• Warranty: 12 months
• Unit of measure: each
• Inside mounting legs: 56mm
• Mount centre-to-centre: 184mm
• Pivot hole diameter: 10mm
• Adjusting hole diameter: M8 x 1.25

Fitment guidance

• Holden / Saab with Z18XE engine
• Compare part number 1986A00819 before purchase
• Check the 5 groove pulley matches the vehicle belt setup
• Confirm the twin leg mount and 184mm centre-to-centre measurement
• Verify the 56mm inside mounting legs, 10mm pivot hole, and M8 x 1.25 adjusting hole against the removed unit

Application and Buying Notes

Before buying, match the replacement alternator to the vehicle’s existing mounting layout and pulley arrangement. The key identifiers here are part number 1986A00819, 12V charging system compatibility, 120A output, and the twin leg mount with a 5 groove pulley. If the physical mounting points do not line up, the alternator may not be suitable even where the engine family is similar.

The fitment note provided is limited to Holden / Saab with Z18XE engine, so it is wise to verify the engine code on the vehicle and compare the old unit carefully. The listed measurements — 56mm inside mounting legs, 184mm mount centre-to-centre, 10mm pivot hole diameter, and M8 x 1.25 adjusting hole — are the most practical checks for confirming the replacement against the removed alternator.

The pulley note is also important because this unit is stated to replace the original clutch style pulley unit. If the existing alternator uses a clutch pulley, confirm that the belt path, pulley section, and physical clearance are correct before fitting. The internal regulator specification means the charging system should be matched to the vehicle’s original arrangement rather than assumed from appearance 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 1986A00819 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, Inside Mounting Legs 56mm, Pivot Hole Diameter 10, Pulley Section 5 Groove, Voltage 12, Alternator Mount Twin Leg, Product Group 2 ALTERNATORS.

Additional published details for cross-checking include Part No. 1986A00819, Brand BOSCH, Description Bosch Alternator 12V 120A, Adjusting Hole Diameter M8 x 1.25, Pin Code IR189, Power Rating (Amp) 120, Regulator Type Internal, Note Will replace original clutch style pulley unit, Mount Cnt to Cnt 184mm, Product Group 1 ROTATING ELECTRICAL.

Bosch Alternator 12V 120A. Part number 1986A00819 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 Twin Leg. Regulator type is Internal. Pulley configuration is 5 Groove. Those physical and electrical details should line up with the original unit before the replacement is approved for fitment.

For part number 1986A00819, 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.

Where no verified application list is available, the part number, mounting details, connector style, and published specifications should be used as the primary selection criteria.

In the absence of a verified fitment list, the safest approach is to compare the removed unit directly with the listed product details. That includes checking the housing style, pulley layout, regulator arrangement, and any visible identification numbers before supply is approved.

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 using part number 1986A00819, the Holden / Saab Z18XE application note, and the listed mounting and pulley measurements before ordering or fitting.

FAQ

What is the part number for this alternator?

The part number supplied is 1986A00819.

What voltage and output does this alternator have?

It is a 12V alternator rated at 120 amps.

What vehicles is it listed to suit?

It is listed to suit Holden / Saab with Z18XE engine.

What type of pulley does it use?

It has a 5 groove pulley. The note also states it will replace the original clutch style pulley unit.

What mounting measurements are provided?

The listed measurements are 56mm inside mounting legs, 184mm mount centre-to-centre, 10mm pivot hole diameter, and M8 x 1.25 adjusting hole.

Does it have an internal regulator?

Yes. The regulator type is listed as internal.