WAI 21798N Alternator

Alternator Overview

This WAI alternator, part number 21798N, is a direct electrical replacement for the charging system on compatible Subaru applications. It is built as a 100% new unit, not remanufactured, and is engineered to deliver the amperage needed for modern vehicle electrical loads.

Key Features

• 150-amp output for stable charging performance.
• Internal regulator for integrated voltage control.
• Internal fan design for compact alternator construction.
• Serpentine belt pulley with 6 grooves.
• Decoupled clutch pulley included for smoother belt operation.
• 100% new construction with proprietary components and processes.

Detailed Description

WAI part number 21798N is a 12-volt alternator built for vehicles that rely on consistent charging output and dependable electrical support. The Mitsubishi-family design uses an internal regulator, internal fan, and serpentine pulley setup with six grooves, along with a decoupled clutch pulley and included pulley assembly. Fits 2019-2020 Subaru Forester, N/A. This part cross-references Gates 21798 for the same application.

Common Issues This Part May Solve

• Low battery charging caused by a weak alternator.
• Dim lights or unstable electrical performance under load.
• Battery warning light triggered by charging system faults.
• Belt noise or irregular alternator pulley operation.

Installation Notes and Tips

Verify connector style, pulley configuration, and amperage rating before installation. Confirm the vehicle uses the same 12-volt charging system layout and serpentine belt arrangement. Fits 2019-2020 Subaru Forester, N/A. Use the part number 21798N to confirm application details during ordering and service.

Quality Assurance

WAI states this alternator is manufactured as a new unit rather than remanufactured, using proprietary components and processes to support long service life and consistent performance.