Bosch Alternator 12V 70A BXN1231A

The Bosch BXN1231A is a new 12V alternator rated at 70A and supplied as a single unit each. It uses an internal regulator, a twin leg alternator mount, and a 4 groove pulley with a 69mm outside diameter, so the mounting style and pulley setup need to suit the vehicle before purchase.

Key dimensions on this unit include 80mm inside mounting legs, a 10mm pivot hole diameter, an M8 x 1.25 adjusting hole, and a 177mm mount centre-to-centre measurement. The shaft dimension is listed at 17, and the unit weighs 8.4kg, which are useful checks when comparing against the existing alternator.

This Bosch alternator is listed under part number BXN1231A and pin code IR110. It is backed by a one year warranty and is described as being made from high quality raw materials, corrosion resistant, and designed with a reduction drive to maintain continual speeds for easier starting.

Key Features

• New Bosch alternator
• 12V, 70A output
• Internal regulator
• 4 groove pulley
• Twin leg mount
• Corrosion resistant construction

Specifications

• Part No.: BXN1231A
• Pin Code: IR110
• Voltage: 12V
• Power Rating: 70A
• Unit of Measure: Each
• Warranty: One Year
• Alternator Mount: Twin Leg
• Pulley Section: 4 Groove

Vehicle fitment guidance

• Fitment data includes selected Datsun, Holden and Nissan applications.
• Listed makes include Datsun, Holden, Nissan and HDT.
• Sample applications shown include Datsun Sunny, Holden Calais, Holden Commodore, Nissan Bluebird, Nissan Cabstar and Nissan Cefiro.
• The fitment list also references Datsun Sunny model years 1979 to 1983, Holden Calais model years 1986 to 1988, Holden Commodore model years 1986 to 1988, Nissan Bluebird model years 1985 to 1986, Nissan Cabstar model years 1991 to 1993, and Nissan Cefiro model years 1988 to 1991.
• HDT Brock is also shown in the fitment data, including 1988.

Application and Buying Notes

Before ordering, compare the BXN1231A part number, the twin leg mount, and the 4 groove pulley setup against the alternator already fitted to the vehicle. The 80mm inside mounting legs, 10mm pivot hole diameter, M8 x 1.25 adjusting hole, and 177mm mount centre-to-centre measurement are the most useful installation checks.

The 12V, 70A rating is suitable only where that electrical output matches the vehicle’s charging system requirements. A lower or higher output alternator may not be a direct replacement, even if some mounting points appear similar.

The internal regulator is another important detail to confirm. If the existing unit uses a different regulator arrangement, the alternator may not connect or operate as expected without the correct application match.

Because fitment lists can vary by engine, build year, and charging system configuration, it is best to verify the application using the part number BXN1231A, the pin code IR110, and the physical dimensions before purchase. Where there is any uncertainty, compare the old unit side by side or seek confirmation from a qualified parts interpreter.

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 BXN1231A 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 One Year, Inside Mounting Legs 80mm, Pivot Hole Diameter 10, Pulley Outside Diameter 69mm, Regulator Type Internal, Voltage 12, Mount Cnt to Cnt 177mm, Shaft Dimension 17.

Additional published details for cross-checking include Product Group 2 ALTERNATORS, Part No. BXN1231A, Brand BOSCH, Description Bosch Alternator 12V 70A, Adjusting Hole Diameter M8 x 1.25, Pin Code IR110, Power Rating (Amp) 70, Pulley Section 4 Groove, Suits Unit Make Bosch.

Bosch Alternator 12V 70A. Part number BXN1231A should be checked first. Listed voltage is 12. Listed output rating is 70. 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 4 Groove. Those physical and electrical details should line up with the original unit before the replacement is approved for fitment.

For part number BXN1231A, 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 70 should be checked carefully. Incorrect selection can affect installation time, return freight, and equipment availability.

Available application references include DATSUN SUNNY, DATSUN SUNNY 1979, DATSUN SUNNY 1980, DATSUN SUNNY 1981, HDT BROCK, HDT BROCK 1988. 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 compatibility by matching part number BXN1231A, pin code IR110, mount style, pulley configuration, and the listed dimensions against the vehicle’s existing alternator and application details before ordering.

FAQ

What type of alternator is this?

It is a Bosch alternator, listed as a new 12V unit with a 70A power rating and an internal regulator.

What is the part number?

The part number is BXN1231A. The pin code is IR110.

What pulley does it use?

It uses a 4 groove pulley with a 69mm outside diameter.

What mounting details are listed?

The unit is a twin leg alternator mount with 80mm inside mounting legs, a 10mm pivot hole diameter, an M8 x 1.25 adjusting hole, and 177mm mount centre-to-centre.

Which vehicles are shown in the fitment data?

The fitment data includes selected Datsun, Holden, HDT and Nissan applications, with sample references such as Datsun Sunny, Holden Calais, Holden Commodore, Nissan Bluebird, Nissan Cabstar and Nissan Cefiro.

Is there a warranty?

Yes. The alternator is listed with a one year warranty.