Bosch Alternator 12V 85A BXF1257A

This Bosch alternator is a 12V, 85A unit with part number BXF1257A and a 3 groove pulley. It is a new alternator, supplied each, with an internal regulator and a one year warranty.

Key mounting details include a twin leg alternator mount, 66mm inside mounting legs, an M10x1.25 pivot hole diameter, an M10x1.25 adjusting hole diameter, and 187mm mount centre to centre. Those measurements matter when checking physical replacement fitment.

The unit weighs 4.98kg and has a 53mm pulley outside diameter. It is listed as Bosch unit make, with pin code IR110, and is intended as a direct replacement style electrical component where the matching mounting and pulley details are confirmed.

Used correctly, the 85A power rating and internal regulator suit applications that require this exact alternator specification. As with any electrical replacement, the part number and the measured mounting points should be checked carefully before purchase.

Key Features

• Bosch alternator, 12V and 85A
• New unit, supplied each
• Internal regulator type
• 3 groove pulley
• Twin leg alternator mount
• One year warranty

Specifications

• Part No.: BXF1257A
• Voltage: 12V
• Power rating: 85A
• Weight: 4.98kg
• Pulley outside diameter: 53mm
• Pulley section: 3 groove
• Inside mounting legs: 66mm
• Mount centre to centre: 187mm

Verified fitment information

• Fitment data supplied includes Ford applications such as F-150, Fairlane, Fairmont, Falcon and LTD.
• Fitment data supplied also includes Mitsubishi Magna applications.
• Sample fitment references include Ford F-150 1991, 1992, 1993, 1994, 1995 and 1996.
• Sample fitment references include Mitsubishi Magna 1987, 1988 and 1989.

Application and Buying Notes

Before ordering, compare the part number BXF1257A with the alternator you are replacing, then check the physical mounting details: twin leg mount, 66mm inside mounting legs, 187mm mount centre to centre, and M10x1.25 pivot and adjusting hole sizes. Those measurements are often the quickest way to confirm whether the housing matches your existing setup.

The 12V, 85A output is an important checkpoint if your vehicle has specific charging requirements or electrical accessories. The pulley is a 3 groove type with a 53mm outside diameter, so the belt drive arrangement must match as well. A pulley mismatch can stop the unit from fitting or operating correctly even if the mounting looks similar.

This alternator is listed with an internal regulator, so it should only be compared with an application that uses that regulator arrangement. If your original unit differs in regulator type, mounting leg style, or pulley section, confirm those details before fitting. The 4.98kg weight is also a useful reference when comparing replacement units over the counter or by photo.

The supplied fitment references include Ford and Mitsubishi Magna applications, but vehicle fitment can still vary by build details, engine arrangement, and charging system configuration. Use the part number, mounting dimensions, pulley specification, and the existing alternator side by side to confirm suitability before purchase.

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 BXF1257A 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 66mm, Pivot Hole Diameter M10x1.25 / 10, Pulley Outside Diameter 53mm, Regulator Type Internal, Voltage 12, Mount Cnt to Cnt 187mm, Weight 4.98kg.

Additional published details for cross-checking include Product Group 1 ROTATING ELECTRICAL, Part No. BXF1257A, Brand BOSCH, Description Bosch Alternator 12V 85A, Adjusting Hole Diameter M10x1.25, Pin Code IR110, Power Rating (Amp) 85, Pulley Section 3 Groove, Suits Unit Make Bosch, Alternator Mount Twin Leg.

Bosch Alternator 12V 85A. Part number BXF1257A should be checked first. Listed voltage is 12. Listed output rating is 85. 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 3 Groove. Those physical and electrical details should line up with the original unit before the replacement is approved for fitment.

For part number BXF1257A, 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 85 should be checked carefully. Incorrect selection can affect installation time, return freight, and equipment availability.

Compatibility note: Please confirm fitment with part number BXF1257A and the listed application details, including the 12V 85A specification, twin leg mount, 3 groove pulley, and the mounting measurements before ordering.

FAQ

What is the part number for this Bosch alternator?

The part number is BXF1257A. For this listing, part number BXF1257A is the main reference point. Listed voltage is 12. Listed output rating is 85. Published fitment references include FORD F-150, FORD F-150 1991, FORD F-150 1992. These details should still be checked against the original unit before ordering.

What voltage and output does this alternator have?

It is a 12V alternator with an 85A power rating. For this listing, part number BXF1257A is the main reference point. Listed voltage is 12. Listed output rating is 85. Published fitment references include FORD F-150, FORD F-150 1991, FORD F-150 1992. These details should still be checked against the original unit before ordering.

Is this alternator new or remanufactured?

It is listed as new. For this listing, part number BXF1257A is the main reference point. Listed voltage is 12. Listed output rating is 85. Published fitment references include FORD F-150, FORD F-150 1991, FORD F-150 1992. These details should still be checked against the original unit before ordering.

What type of regulator does it use?

It has an internal regulator. For this listing, part number BXF1257A is the main reference point. Listed voltage is 12. Listed output rating is 85. Published fitment references include FORD F-150, FORD F-150 1991, FORD F-150 1992. These details should still be checked against the original unit before ordering.

What pulley details are listed?

The alternator has a 3 groove pulley and the pulley outside diameter is 53mm. For this listing, part number BXF1257A is the main reference point. Listed voltage is 12. Listed output rating is 85. Published fitment references include FORD F-150, FORD F-150 1991, FORD F-150 1992. These details should still be checked against the original unit before ordering.

What fitment families are referenced?

The supplied fitment information references Ford applications including F-150, Fairlane, Fairmont, Falcon and LTD, plus Mitsubishi Magna applications. For this listing, part number BXF1257A is the main reference point. Listed voltage is 12. Listed output rating is 85. Published fitment references include FORD F-150, FORD F-150 1991, FORD F-150 1992. These details should still be checked against the original unit before ordering.