Remy 21781 Alternator

Remanufactured Alternator for Buick and Pontiac

Remy 21781 is a premium remanufactured alternator built for 12-volt charging systems that require 105 amps. It features an internal fan, internal voltage regulator, clockwise rotation, and a pulley included for direct replacement service. This alternator is a fit for select Buick LeSabre and Pontiac Bonneville applications, including 2004 models and 2000-2003 vehicles with a 105-amp capacity.

Key Features

• 105 amp amperage rating for factory-style charging output
• 12-volt remanufactured alternator
• Internal fan and internal voltage regulator
• Clockwise rotation
• Pulley included
• OE manufacturer reference: Delco/Delphi
• Part number: 21781

Product Details

Remy Premium Remanufactured 21781 is built for drivers replacing a worn charging unit in Buick LeSabre and Pontiac Bonneville vehicles. It is engineered for applications that use a 105-amp alternator and is not compatible with vehicles equipped with less than 105 amps capacity. Cross-reference part numbers for this application include 10464439 and 10480411.

Compatible fitment includes Fits 2004 Buick LeSabre, N/A and Fits 2000-2003 Buick LeSabre, N/A; Fits 2004 Pontiac Bonneville, N/A and Fits 2000-2003 Pontiac Bonneville, N/A. The Remy 21781 alternator supports the charging system requirements of these specific vehicles while matching the listed OE manufacturer reference.

Common Issues This Part Can Address

• Battery warning light caused by alternator output loss
• Low charging voltage during normal driving
• Dim lights or electrical instability from a failing alternator
• Charging system noise related to worn internal components
• Vehicle starting problems tied to insufficient battery recharge

Installation Notes and Tips

Verify the vehicle’s charging system rating before ordering, since this part is not compatible with vehicles that have less than 105 amps capacity. Confirm pulley style, rotation direction, voltage, and regulator type against the original unit before installation. For best results, inspect the battery, belt condition, and charging circuit connections when replacing the alternator.

Quality Assurance

Remy Premium Remanufactured parts are remanufactured to meet application-specific electrical requirements and OE-style fitment expectations for the listed Buick LeSabre and Pontiac Bonneville vehicles.