Prestolite Alternator 12V 70A CCW Part No. A1739B

This Prestolite alternator is a new 12V unit rated at 70A, with CCW rotation and an internal fan. The part number is A1739B, and the unit is sold as each. If you are replacing an alternator and need to match the electrical setup closely, the voltage, amperage, rotation direction and part number are the key details to check first.

As a rotating electrical component, this alternator sits in the category of standard charging-system replacement parts where correct specification matching matters. The listed brand is Prestolite, the unit make is Prestolite, and the product is identified as a new alternator rather than remanufactured. Those details are useful when comparing against an existing unit or confirming a replacement order.

The supplied specification set confirms 12 volts, 70 amps, CCW rotation and internal fan construction, along with a one year warranty. For buyers working from an old part or a workshop note, the A1739B part number is the clearest reference point and should be checked against the unit being replaced before purchase.

Key Features

• New alternator, not remanufactured
• 12V electrical system
• 70A output rating
• CCW rotation
• Internal fan
• Prestolite brand and unit make

Specifications

• Type: Alternator
• Brand: Prestolite
• Part No.: A1739B
• Voltage: 12V
• Power Rating: 70A
• Rotation: CCW
• Construction feature: Internal fan
• Condition: New

Application and Buying Notes

Before ordering, confirm the alternator on the vehicle or machine matches the key identifiers listed here: A1739B, 12V, 70A and CCW rotation. Those details are the most reliable starting point for replacement work, especially when the existing unit has a worn label or the application is not immediately obvious.

The rotation direction is important because this unit is specified as CCW. A clockwise unit is not a direct match for a counter-clockwise application, even if the casing looks similar. The internal fan detail is also worth checking against the original unit, as cooling design can vary between alternators.

If you are comparing this alternator against a removed part, use the part number first, then confirm the electrical rating. A 70A alternator may be suitable where that output is specified, but the correct replacement still depends on matching the original application details. For that reason, checking the old unit and any service documentation before purchase is the safest approach.

The product is sold as a new Prestolite alternator with a one year warranty. That gives a clear baseline for replacement planning, but it does not replace the need to verify physical and electrical compatibility. When in doubt, compare the alternator tag, mounting layout and wiring arrangement on the vehicle with the replacement unit 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 A1739B 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, Rotation CCW, Voltage 12, Product Group 2 ALTERNATORS, Part No. A1739B, Brand PRESTOLITE, Description Prestolite Alternator 12V 70A CCW.

Additional published details for cross-checking include Power Rating (Amp) 70, Suits Unit Make Prestolite, New / Reman. New, Product Group 1 ROTATING ELECTRICAL.

Prestolite Alternator 12V 70A CCW. Part number A1739B 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.

For part number A1739B, 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.

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 compatibility by matching part number A1739B, 12V voltage, 70A output and CCW rotation with the original unit and application details before ordering.

FAQ

What is the part number for this alternator?

The part number is A1739B. For this listing, part number A1739B is the main reference point. Listed voltage is 12. Listed output rating is 70. 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 A1739B is the main reference point. Listed voltage is 12. Listed output rating is 70. These details should still be checked against the original unit before ordering.

What voltage is this alternator?

It is a 12V alternator. For this listing, part number A1739B is the main reference point. Listed voltage is 12. Listed output rating is 70. These details should still be checked against the original unit before ordering.

What is the amperage rating?

The power rating is 70A. For this listing, part number A1739B is the main reference point. Listed voltage is 12. Listed output rating is 70. These details should still be checked against the original unit before ordering.

What rotation does this alternator have?

It is specified as CCW rotation. For this listing, part number A1739B is the main reference point. Listed voltage is 12. Listed output rating is 70. These details should still be checked against the original unit before ordering.

Does the listing include a warranty?

Yes, the listed warranty is one year. For this listing, part number A1739B is the main reference point. Listed voltage is 12. Listed output rating is 70. These details should still be checked against the original unit before ordering.