MPA Electrical 13791N Alternator

OE-Style Alternator for Lexus GS300 and IS300

MPA Electrical 13791N is a 12-volt, 100-amp alternator built for select Lexus charging system applications. It features an internal regulator, internal fan, clockwise rotation, and a 6-groove serpentine pulley for direct-fit replacement service.

This alternator is a New line unit from MPA Electrical and is built around Nippondenso specifications for the listed Lexus GS300 and Lexus IS300 applications. If you are replacing a failing charging unit on a 1998-2005 Lexus GS300 or a 2001-2005 Lexus IS300, part number 13791N provides the correct electrical and pulley configuration for those vehicles.

• 100 amps output for standard charging system replacement
• 12-volt alternator with internal voltage regulator
• Internal fan design
• Clockwise rotation
• 6-groove serpentine pulley
• Built to Nippondenso specifications
• Fits 1998-2005 Lexus GS300
• Fits 2001-2005 Lexus IS300

Detailed Product Information

MPA Electrical 13791N is an alternator replacement for Lexus GS300 and Lexus IS300 models that use a Nippondenso-style charging system. The unit is specified at 100 amps and 12 volts, with an internal regulator and internal cooling fan to match the original equipment layout. The 6-groove serpentine pulley and clockwise rotation are important details for proper belt alignment and charging performance. This part cross-references BBB Industries 13791 for the same application.

Common Charging System Issues

• Battery warning light stays on while driving
• Low charging voltage or intermittent charging output
• Dim headlights, weak interior lighting, or electrical instability
• Battery repeatedly discharges after normal use
• Noise or failure from a worn alternator assembly

Installation Notes and Tips

Verify pulley groove count, rotation direction, and connector style before installation. Confirm the vehicle uses the listed Lexus GS300 or Lexus IS300 application and compare the removed unit to part number 13791N for match-up on mounting points and electrical connections. Inspect the drive belt and charging circuit condition during replacement to help avoid repeat failures.

Quality Assurance

MPA Electrical supplies new replacement electrical components built to match the listed application details, including amperage, voltage, pulley type, and regulator configuration. Part number 13791N is specified for the covered Lexus fitments and follows Nippondenso-based design requirements for those vehicles.