BBB Industries N13876 Alternator

BBB Industries N13876 Alternator for Jeep TJ and Wrangler

The BBB Industries NEW ALTERNATOR N13876 is a 12-volt charging system replacement built for select Jeep TJ and Jeep Wrangler applications. With a 117-amp output, external voltage regulator design, and OE manufacturer reference to Nippondenso, this alternator matches the electrical and pulley specifications needed for direct replacement service.

Key Features

• 117 amp amperage rating for factory-style charging output
• 12V alternator with external voltage regulator type
• Air-cooled design with internal fan
• 6-groove pulley included for serpentine belt systems
• Clockwise rotation with negative polarity
• OE manufacturer reference: Nippondenso
• Cross-reference part number: 121000-3820

Product Details

BBB Industries N13876 is a replacement alternator for Jeep TJ and Jeep Wrangler models that use a serpentine belt drive and a 6-groove pulley setup. The unit is configured with a 1 o'clock plug clock position, a conventional pulley, and a 2-1/2 inch outside pulley diameter. It is built for 12-volt systems and uses an external regulator layout, making it a direct-fit electrical charging component for the listed Jeep applications. This part number, N13876, also cross-references 121000-3821 for the same application.

Compatible With

• Fits 2005-2006 Jeep TJ, N/A, 117 Amps; NEW ALTERNATOR
• Fits 2003 Jeep TJ, N/A, 117 Amps; NEW ALTERNATOR
• Fits 2005-2006 Jeep Wrangler, N/A, 117 Amps; NEW ALTERNATOR
• Fits 2003 Jeep Wrangler, N/A, 117 Amps; NEW ALTERNATOR
• Fits 2004 Jeep TJ, N/A, Std; 117 Amps; NEW ALTERNATOR
• Fits 2004 Jeep Wrangler, N/A, Std; 117 Amps; NEW ALTERNATOR
• Fits 2001-2002 Jeep TJ, N/A, Opt; 117 Amps; NEW ALTERNATOR
• Fits 2001-2002 Jeep Wrangler, N/A, Opt; 117 Amps; NEW ALTERNATOR

Common Issues This Part Addresses

• Low battery charging caused by a worn alternator
• Dim lights or electrical instability at idle
• Battery warning light triggered by charging system faults
• Noise from a failing alternator pulley or internal bearing wear
• Charging output loss in Jeep TJ and Jeep Wrangler electrical systems

Installation Notes and Tips

Verify pulley groove count, plug clock position, rotation direction, and regulator style before installation. Confirm the vehicle uses the listed serpentine belt configuration and compare the original alternator against the OE reference and part number N13876. Inspect the belt, connectors, and charging circuit before final startup to ensure proper system operation.

Quality Assurance

BBB Industries supplies replacement electrical components engineered to match OE-style fitment and specifications for service applications. This alternator is built around the listed amperage, pulley, and regulator requirements for the supported Jeep TJ and Jeep Wrangler models.