Remy 20457 Alternator

Remanufactured 105 Amp Alternator

Remy 20457 is a premium remanufactured alternator built for 12-volt charging systems with a 105 amp output, internal voltage regulation, and clockwise rotation. It includes the pulley and uses an external fan design for applications that match the OE Delco/Delphi configuration.

Built for Chevrolet and GMC trucks, SUVs, and related platforms from the late 1980s through 1993, this alternator supports direct replacement needs where the original unit uses the same plug and amperage requirements. Remy 20457 is a practical choice for restoring stable charging performance on vehicles such as the Chevrolet C1500, GMC K1500, and Chevrolet Blazer.

Key Features

• 105 amp amperage rating for OE-style charging output
• 12-volt alternator with internal voltage regulator
• Remanufactured unit from Remy Premium Remanufactured
• External fan design
• Pulley included
• Clockwise rotation
• OE manufacturer reference: Delco/Delphi
• Part number: 20457

Detailed Description

Remy Premium Remanufactured 20457 is an alternator for GM light-duty trucks and SUVs that require a 105 amp charging system. It is listed across a wide range of Chevrolet and GMC applications, including 1990-1993 Chevrolet C1500, 1993 GMC C1500, 1991-1993 Chevrolet Blazer, and 1992-1993 GMC Yukon. Fitment also includes several 1993 heavy-duty and suburban applications with specific plug and housing notes, so matching the connector style and amperage requirement is important before installation.

This part cross-references FTE 1101629 for the same application.

What It Helps Solve

• Battery warning lights caused by weak charging output
• Low system voltage at idle or under electrical load
• Dim headlights and inconsistent accessory performance
• Charging failure from a worn or remanufactured-out alternator
• OE replacement needs on Chevrolet and GMC 105 amp applications

Installation Notes and Tips

• Verify the vehicle requires a 105 amp alternator before ordering.
• Check the alternator plug position and connector style, especially on 1993 applications with 7:00 Alt Plug or 4-pin plug notes.
• Confirm clockwise rotation and pulley alignment with the original unit.
• Inspect the battery, belt, and charging cables during replacement to avoid repeat charging issues.
• Match the OE Delco/Delphi-style configuration to the vehicle’s original setup.

Quality Assurance

Remy Premium Remanufactured parts are remanufactured to meet the needs of OE-style replacement applications. This alternator is built around the original Delco/Delphi design reference and the specified 105 amp charging requirement for the listed Chevrolet and GMC vehicles.