MPA Electrical 13939N Alternator

Alternator for Nissan Altima and Sentra

MPA Electrical 13939N is a 12-volt alternator built for 2002-2006 Nissan Altima and 2002-2006 Nissan Sentra applications. It uses a 110-amp output, internal fan, internal regulator, and a 6-groove serpentine decoupling pulley for OE-style charging system service.

Key Features

• 110 amps for charging system output
• 12-volt electrical system application
• Internal fan and internal regulator
• 6-groove serpentine decoupling pulley
• Clock position: 1:00
• Clockwise rotation
• Manufacturer: Hitachi

Product Details

MPA Electrical part number 13939N is a replacement alternator for Nissan Altima and Nissan Sentra models in the 2002-2006 range. The unit is specified with a 1:00 clock position, clockwise rotation, and a Hitachi-style configuration, which helps match the original charging system layout during replacement. This part cross-references BBB Industries 13939 for the same application.

Common Issues This Part Can Address

• Battery warning light caused by low alternator output
• Dim headlights or unstable electrical performance
• Battery not maintaining charge during normal driving
• Charging system noise related to alternator wear
• Electrical accessories operating inconsistently at idle

Installation Notes and Tips

Verify pulley style, clock position, rotation, and connector match before installation. Confirm fitment for your exact Nissan Altima or Nissan Sentra year and charging system configuration, and inspect the belt condition and related charging components during replacement. Use the vehicle’s service information to confirm proper belt routing and electrical connections.

Quality Assurance

MPA Electrical supplies this alternator as a new replacement unit with OE-style specifications for the listed Nissan applications. The Hitachi manufacturer reference and detailed electrical and pulley specifications support accurate parts matching for 2002-2006 Altima and Sentra vehicles.