Prestolite Alternator 24V 250A BLD4102M

The Prestolite BLD4102M is a new 24V alternator rated at 250A, supplied as a single unit and designed with an internal regulator. It is listed with an insulated return and a twin leg alternator mount, so it suits applications where those mounting and electrical details match the existing unit.

Key physical points include 101mm inside mounting legs, a 216mm mount centre-to-centre dimension, a 13mm pivot hole diameter, and a 1/2 UNC adjusting hole diameter. The shaft diameter is 22mm, the rotation is clockwise, and there is no pulley section specified as it is noted as not applicable.

This alternator is identified under part number BLD4102M and is described as a Prestolite alternator for Prestolite units. It is also noted as suitable for dual alternator applications, which makes the exact mounting layout and electrical setup worth checking before ordering.

Key Features

• 24V alternator rated at 250A
• Internal regulator
• New unit
• Twin leg alternator mount
• Clockwise rotation
• Insulated return

Specifications

• Part number: BLD4102M
• Brand: Prestolite
• Type: Alternator
• Voltage: 24V
• Power rating: 250A
• New / remanufactured: New
• Warranty: 36 months / 500,000 kms
• Inside mounting legs: 101mm

Application and Buying Notes

Before buying, match the part number BLD4102M against the unit being replaced and compare the mounting and electrical details. The verified points for this alternator are 24V, 250A, twin leg mounting, 101mm inside mounting legs, and a 216mm mount centre-to-centre measurement.

The shaft diameter is 22mm, the pivot hole diameter is 13mm, and the adjusting hole diameter is 1/2 UNC. Those dimensions need to line up with the bracket and belt adjustment arrangement already on the vehicle or equipment, otherwise the alternator will not be a direct physical match.

Because the alternator has an internal regulator and insulated return, it should only be considered where the charging system is intended for that configuration. The unit also has Sense, Lamp and AC terminals, so the existing wiring connections need to be checked carefully before installation.

The clockwise rotation and the note that pulley section is not applicable are also important checks. If the removed alternator uses a different rotation direction, shaft size, or pulley arrangement, that is a sign the fitment should be rechecked before purchase.

This alternator is noted as suitable for dual alternator applications, but that does not remove the need to confirm the exact application. Use the vehicle or equipment details, the existing alternator label, and the mounting measurements together rather than relying on output rating alone.

The unit is new and carries a 36 month / 500,000 kms warranty, which is useful for buyers wanting a replacement rather than a remanufactured unit. Even so, the safest approach is to verify the mounting legs, terminal layout, rotation, and part number before fitting.

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 BLD4102M 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 36 Months 500000kms, Inside Mounting Legs 101mm, Power Rating (Amp) 250, Regulator Type Internal, Shaft Diameter 22mm, Voltage 24, Alternator Mount Twin Leg, New / Reman. New.

Additional published details for cross-checking include Weight 16.56kg, Product Group 1 ROTATING ELECTRICAL, Part No. BLD4102M, Brand PRESTOLITE, Description Prestolite Alternator 24V 250A, Adjusting Hole Diameter 1/2 UNC, Pivot Hole Diameter 13, Pulley Section Not Applicable, Rotation CW, Suits Unit Make Prestolite.

Prestolite Alternator 24V 250A. Part number BLD4102M should be checked first. Listed voltage is 24. Listed output rating is 250. 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 Not Applicable. Those physical and electrical details should line up with the original unit before the replacement is approved for fitment.

For part number BLD4102M, 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 250 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.

Compatibility note: Confirm compatibility by checking part number BLD4102M, the 24V 250A rating, twin leg mounting, 101mm inside mounting legs, 216mm mount centre-to-centre, clockwise rotation, and the internal regulator and insulated return configuration against the existing unit.

FAQ

What is the part number for this alternator?

The part number is BLD4102M.

Is this alternator new or remanufactured?

It is listed as new.

What voltage and amperage does it have?

It is a 24V alternator rated at 250A.

Does it have an internal regulator?

Yes. The regulator type is internal.

Can it be used in dual alternator applications?

Yes, it is noted as able to be used in dual alternator applications, but the mounting and electrical details still need to match the vehicle or equipment.

What should I check before ordering?

Check the part number BLD4102M, 24V system voltage, 250A output, twin leg mount, 101mm inside mounting legs, 216mm mount centre-to-centre, 22mm shaft diameter, clockwise rotation, and the insulated return and terminal layout.