WAI 13779N Alternator

Overview

This WAI alternator, part number 13779N, is a new 150 amp charging unit built for Mercedes-Benz applications that use a Bosch-style setup. It is engineered to deliver the output needed for modern electrical loads while replacing the original alternator with a new, non-remanufactured unit.

Compatible with Mercedes-Benz models including the SL500, S500, and E430, this alternator is a fitment-based replacement for a range of Bosch 150 amp applications. The 13779N is built with an internal regulator, internal fan, and included pulley for direct service on supported vehicles.

• 150 amp output for higher electrical demand
• 100% new construction, not remanufactured
• Internal regulator and internal fan design
• 6-groove serpentine pulley included
• Clockwise rotation, right-hand rotation specification

Detailed Description

The WAI 13779N alternator is designed around Bosch-family applications and matches the electrical and mechanical requirements listed in the fitment data. It uses a serpentine belt pulley with six grooves, a clockwise rotation pattern, and an internal regulator to support stable charging performance. This makes it a direct replacement choice for Mercedes-Benz charging systems that call for a 150 amp alternator.

Fitment includes Mercedes-Benz SL500, SL600, S500, S420, E430, CLK430, C43 AMG, E55 AMG, CL500, CL600, CL55 AMG, S55 AMG, and CLK55 AMG applications across the listed model years. If you are replacing a Mercedes-Benz alternator with Bosch 150 amp specifications, part number 13779N is matched to those requirements in the catalog data.

What It Helps Address

• Low charging output from a worn alternator
• Battery warning lights caused by charging system failure
• Electrical strain from accessories and vehicle loads
• Inconsistent voltage delivery at the charging system
• Noise or pulley-related issues on the original unit

Installation Notes

Verify the pulley groove count, belt type, rotation direction, and amperage rating before installation. This alternator is listed with an internal regulator and included pulley, so the replacement should be matched to the original charging system configuration. Confirm the vehicle-specific fitment notes, especially Bosch 150 amp and New designations where shown in the catalog.

Quality Assurance

WAI states that this alternator is 100% new and built with proprietary components and processes to support long service life and consistent performance. Part number 13779N is cataloged as a new replacement alternator for supported Mercedes-Benz charging system applications.