Prestolite Alternator 24V 55A New Single Leg 66021507

The Prestolite Alternator 24V 55A, part number 66021507, is a new heavy commercial alternator supplied as a single unit each. It is rated at 24 volts and 55 amps, with an insulated return and bi-directional rotation, making those details important to check against the vehicle’s charging system before ordering.

This unit is identified with OEM number 66021507S and is listed for the Prestolite unit make. The mounting arrangement is single leg, with a mount centre-to-centre measurement of 182mm, mount leg thickness of 76mm, and adjusting and pivot hole diameters of 11mm and 10mm respectively.

The alternator includes a field isolation terminal, ignition terminal, lamp terminal, and AC terminal. Those connection points matter when matching the replacement to the existing wiring and charging setup, especially on 24V heavy commercial applications where the terminal layout and insulation arrangement need to line up correctly.

Key Features

• 24V, 55A heavy commercial alternator
• New unit, supplied each
• Prestolite unit make
• Single leg alternator mount
• Bi-directional rotation
• Insulated return

Specifications

• Brand: Prestolite
• Part No.: 66021507
• OEM Number: 66021507S
• Voltage: 24V
• Power Rating: 55A
• Type: Alternator Heavy Comm
• Condition: New
• Unit of Measure: Each

Application and Buying Notes

Before ordering, confirm the replacement against part number 66021507 and OEM number 66021507S, as those identifiers are the clearest match points for this Prestolite alternator. The 24V, 55A rating should also be checked against the vehicle’s charging system requirements so the replacement suits the application properly.

The mounting details are specific: single leg mount, 182mm mount centre-to-centre, 76mm mount leg thickness, 11mm adjusting hole diameter, and 10mm pivot hole diameter. These measurements need to align with the existing bracket and hardware, otherwise the alternator may not sit correctly or may require parts that are not included here.

At 5.3kg, this is a substantial heavy commercial rotating electrical component rather than a light-duty alternator. If the existing unit is damaged, compare the old housing, connector points, and mounting ears directly with these specifications before fitting, especially where access is limited or the vehicle is on a 24V commercial electrical system.

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 66021507 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 HEAVY COMM, Unit of Measure EACH, Warranty One Year, Mount Leg Thickness 76mm, Power Rating (Amp) 55, Suits Unit Make Prestolite, Note Field Isolation terminal, Mount Cnt to Cnt 182mm, Insulated Return Yes, Weight 5.3kg.

Additional published details for cross-checking include Product Group 1 ROTATING ELECTRICAL, Part No. 66021507, Brand PRESTOLITE, Description Prestolite Alternator 24V 55A, Adjusting Hole Diameter 11, Pivot Hole Diameter 10, Rotation Bi-Directional, Voltage 24, Alternator Mount Single Leg, New / Reman. New.

Prestolite Alternator 24V 55A. Part number 66021507 should be checked first. Listed voltage is 24. Listed output rating is 55. These details form the core reference points used by parts interpreters when confirming the correct replacement.

Mount style is Single Leg. Those physical and electrical details should line up with the original unit before the replacement is approved for fitment.

For part number 66021507, 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 heavy comm in workshop, fleet, trade, agricultural, or construction service, the listed voltage 24 and output 55 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.

Compatibility note: Confirm fitment by matching part number 66021507, OEM number 66021507S, 24V/55A rating, single leg mount dimensions, and terminal layout against the original alternator before purchase.

FAQ

What is the part number for this alternator?

The part number is 66021507. The OEM number listed is 66021507S. For this listing, part number 66021507 is the main reference point. Listed voltage is 24. Listed output rating is 55. These details should still be checked against the original unit before ordering.

What voltage and amperage is this alternator?

It is a 24V alternator rated at 55A. For this listing, part number 66021507 is the main reference point. Listed voltage is 24. Listed output rating is 55. These details should still be checked against the original unit before ordering.

Is this a new or remanufactured unit?

It is listed as new. For this listing, part number 66021507 is the main reference point. Listed voltage is 24. Listed output rating is 55. These details should still be checked against the original unit before ordering.

What mounting style does it use?

It uses a single leg alternator mount, with 182mm mount centre-to-centre, 76mm mount leg thickness, 11mm adjusting hole diameter, and 10mm pivot hole diameter. For this listing, part number 66021507 is the main reference point. Listed voltage is 24. Listed output rating is 55. These details should still be checked against the original unit before ordering.

What terminals are included?

The listed terminals are field isolation, ignition, lamp, and AC terminals. For this listing, part number 66021507 is the main reference point. Listed voltage is 24. Listed output rating is 55. These details should still be checked against the original unit before ordering.

Does this alternator have insulated return?

Yes, insulated return is listed as Yes. For this listing, part number 66021507 is the main reference point. Listed voltage is 24. Listed output rating is 55. These details should still be checked against the original unit before ordering.