Remy 12421 Alternator

Remanufactured Alternator for Nissan Sentra

The Remy 12421 is a premium remanufactured alternator built for 12-volt charging systems in select Nissan Sentra applications. It delivers 80 amps of output with an internal regulator, internal fan, and clockwise rotation for direct-fit service on covered vehicles.

Remy Premium Remanufactured products focus on OE-style fit and function, making this alternator a practical replacement for charging-system service on 2002-2006 Nissan Sentra models.

Key Features

• 80 amp alternator output
• 12-volt electrical system
• Internal voltage regulator
• Internal fan design
• Pulley included
• Remanufactured unit
• OE manufacturer reference: Hitachi
• Part number: 12421

Detailed Description

Remy 12421 is a remanufactured alternator engineered for Nissan Sentra charging-system replacement where the original unit was supplied by Hitachi. It is built with clockwise rotation, an internal regulator, and an internal cooling fan to match the electrical and mechanical requirements of the listed application. This alternator cross-references 23100-4Z40B and LR180-769 for the same application.

Compatible With 2002-2006 Nissan Sentra, N/A. The fitment covers 2002, 2003, 2004, 2005, and 2006 Nissan Sentra models, and the Remy 12421 part number should be verified against the original unit before installation.

What It Helps Solve

• Battery warning light caused by low charging output
• Dim headlights or unstable electrical performance
• Dead battery after driving due to alternator failure
• Charging-system noise or inconsistent voltage output
• Replacement of a worn OE Hitachi alternator

Installation Notes and Tips

Confirm pulley style, rotation direction, amperage rating, and connector match before installation. Inspect the drive belt, battery condition, and charging cables during service to avoid repeat failures. Verify the vehicle’s original alternator specifications against part number 12421 and the listed Nissan Sentra fitment.

Quality Assurance

Remy Premium Remanufactured parts are remanufactured to support OE-style replacement needs for electrical and starting-system service. This unit is built around the listed specifications for consistent fitment on covered Nissan Sentra applications.