Remy 20043 Alternator

Remanufactured 63 Amp Alternator for Classic GM Applications

Remy Part Number 20043 is a premium remanufactured alternator built for 12-volt charging systems with a 63 amp rating. It features an internal voltage regulator, external fan, clockwise rotation, and pulley included, making it a direct-fit charging solution for a wide range of classic Chevrolet, GMC, Buick, Cadillac, Oldsmobile, and Pontiac vehicles.

Compatible With 1968-1986 Chevrolet Corvette, 1980-1986 Chevrolet Caprice, and 1985-1986 GMC C/K truck applications that call for a 63 amp Delco/Delphi-style alternator. This part cross-references 1100125 and 1100131 for the same application.

Key Features

• Remy Premium Remanufactured alternator
• 63 amp output for original-style charging performance
• 12-volt electrical system
• Internal voltage regulator
• External fan design
• Pulley included
• Clockwise rotation
• OE manufacturer reference: Delco/Delphi

Product Details

Remy 20043 is a remanufactured alternator intended for vehicles that use a Delco/Delphi-style charging setup with a 63 amp output. The internal regulator simplifies the charging circuit, while the external fan and clockwise rotation match the original equipment configuration used across many GM cars, trucks, vans, and SUVs from 1968 through 1986. This alternator is a practical replacement for aging units in Chevrolet C10, K10, Camaro, Corvette, GMC C1500, and similar classic platforms.

Common Problems This Part Can Address

• Low battery charge or repeated battery drain
• Dim headlights or weak electrical output at idle
• Charging warning light concerns
• Noise or wear from an aging alternator assembly
• Voltage instability in older 12-volt systems

Installation Notes and Fitment Tips

Verify the vehicle’s original alternator style, mounting configuration, and electrical requirements before installation. Fitment includes non-AC and standard applications on many models, along with specific notes such as single mounting foot and 12:00 alternator plug positions on select vehicles. Confirm pulley alignment, rotation direction, and regulator type against the removed unit to ensure proper installation. Fits 1985-1986 Chevrolet C10, N/A; Fits 1986 Chevrolet C20, N/A; Fits 1985-1986 GMC C1500, N/A; Fits 1980-1984 Chevrolet Impala, N/A; Fits 1973-1976 Buick Riviera, N/A.

Quality Assurance

Remy Premium Remanufactured parts are rebuilt to meet the needs of original-equipment-style replacement applications. Part Number 20043 is specified for Delco/Delphi-based charging systems and is listed across a broad range of classic GM fitments for accurate replacement selection.