Remy 20457 Alternator

Reliable Alternator for Chevrolet, GMC, and Oldsmobile Vehicles

The Remy Premium Remanufactured Alternator 20457 is designed to restore proper charging system function in select Chevrolet, GMC, and Oldsmobile models. This remanufactured alternator offers a 105-amp output with an internal voltage regulator, ensuring consistent electrical performance for your vehicle.

Key Features of Remy Alternator Part Number 20457

• Amperage Rating: 105 amps for stable electrical output
• Fan Type: External fan for effective cooling
• Remanufactured unit meeting OE standards
• OE Manufacturer: Delco/Delphi for reliable compatibility
• Pulley Included for straightforward installation
• Rotation Direction: Clockwise to match original equipment
• Voltage: 12 volts suitable for standard automotive electrical systems
• Internal Voltage Regulator for simplified wiring and consistent voltage control

Detailed Description of the Remy Premium Remanufactured Alternator

This alternator, part number 20457, is a remanufactured replacement designed to meet or exceed original equipment specifications. It features a 105-amp output capacity, making it suitable for vehicles requiring moderate electrical loads. The external fan design helps maintain optimal operating temperatures, extending the alternator's service life. With a clockwise rotation and an internal voltage regulator, this unit simplifies installation and ensures compatibility with the charging systems of Chevrolet Blazer, GMC Jimmy, Oldsmobile Lumina, and other related models.

The Premium Remanufactured line from Remy focuses on delivering remanufactured components that maintain OE quality standards. This alternator is rebuilt using tested core components and includes a pulley, reducing the need for additional parts during replacement. The internal voltage regulator eliminates the need for external regulators, streamlining the electrical system and reducing potential failure points.

Compatible Vehicles and Common Applications

• Chevrolet Blazer, S10, S15, and Suburban models
• GMC Jimmy, Sonoma, and Suburban variants
• Oldsmobile Lumina and related models
• Light-duty trucks such as Chevrolet C1500, C2500, C3500, and GMC K1500, K2500, K3500 series
• Suburban and heavy-duty models including R1500, R2500, R3500, V1500, V2500, and V3500

Common Issues Addressed by This Alternator

• Battery not charging or losing charge during operation
• Dimming or flickering dashboard and headlights
• Electrical system warning lights illuminated on the dashboard
• Unusual noises from the alternator area due to worn components
• Failure of the original alternator’s voltage regulator

Installation Notes and Tips

• Ensure the alternator rotation direction matches the original (clockwise)
• Verify the pulley is compatible with your vehicle’s belt system
• Disconnect the battery before installation to prevent electrical shorts
• Check all electrical connections and grounds for corrosion or damage
• Test the charging system after installation to confirm proper operation

Quality Assurance and Warranty Information

The Remy Premium Remanufactured Alternator 20457 is rebuilt to meet OE specifications, using quality-tested components. It includes a pulley and an internal voltage regulator to ensure reliable performance. While specific warranty details may vary, Remy typically offers coverage against defects in materials and workmanship for remanufactured parts. Always consult the warranty documentation provided with the part for exact terms.