Denso 210-4251 Alternator

Denso Reman Alternator for Subaru Forester

The Denso 210-4251 reman alternator is built for 12-volt charging systems and is engineered for dependable output in vehicles with modern electrical loads. It is a direct-fit replacement for select Subaru Forester applications and is designed to support stable charging performance with OE-style fit and finish.

Key Features

• 12.0-volt alternator with 110 amp output
• Internal fan design for charging system cooling
• Clockwise rotation
• External regulator type
• Mitsubishi OE family construction
• Remanufactured to Denso First Time Fit standards
• Validated components including tested stators, rectifiers, rotors, and bearings

Product Details

Denso reman alternators go through a detailed remanufacturing process that includes electrical testing of key internal components and inspection of wear surfaces for consistent operation. The rotor slip rings are finished to a fine surface tolerance to reduce brush wear, while bearings are checked to OE standards and lubricated with premium OE-grade lubricant. The 210-4251 is part of Denso’s reman alternator line, which focuses on proper mounting, accurate alignment, and reliable charging performance for vehicles with sensitive electronics.

This part cross-references Subaru 23700-AA700 for the same application. It also aligns with aftermarket references such as BBB Industries 11579 and Bosch AL4313X.

Vehicle Fitment

• Fits 2011-2013 Subaru Forester, N/A; 110 Amp Alternator; Reman Alternator

Common Charging System Issues

• Low battery charge or repeated battery drain
• Dim headlights or fluctuating electrical output
• Warning lights related to charging system performance
• Noise from worn alternator bearings
• Charging instability under accessory load

Installation Notes

Verify the 12-volt system, 110 amp rating, clockwise rotation, and external regulator configuration before installation. Confirm pulley and mounting alignment against the original unit to ensure proper fit on the Subaru Forester. Inspect the charging circuit, battery condition, and belt system during replacement to help avoid repeat failures.

Quality Assurance

Denso reman alternators are tested against OE standards and built to meet First Time Fit requirements for proper installation and dependable service. The 210-4251 is remanufactured with validated internal components and OE-focused assembly benchmarks to support consistent charging performance.