Subaru EJ20 and EJ25 120 AMP High Output Direct Fit Alternator Black

Subaru EJ20 and EJ25 120 AMP High Output Direct Fit Alternator - Black

Engineered for performance-minded Subarus, this 120 amp high‑output direct‑fit alternator from Aeroflow delivers the extra amperage your modified drivetrain demands while keeping installation straightforward. With a stealth black finish and a true bolt‑in replacement for the OEM unit, it maintains the clean look of your engine bay while supplying reliable charging across the RPM range.

• 120 amp high‑output capability to support additional electrics, performance upgrades, and power adders
• Direct-fit replacement for Subaru EJ20 and EJ25 engines — no fabrication required
• 3" diameter pulley designed for higher revving engines to sustain charging at elevated RPM
• Stealth black finish that blends with most engine bays

Installation and electrical considerations

• To charge properly, the alternator must be grounded to the engine block. If mounting surfaces have paint, clear coat, powder coating, or plating, grounding may be compromised.
• A ground wire from the alternator housing to the engine block is required, and the wire should match the charge wire size.
• A fully charged battery should measure at least 12.6V; a weak or discharged battery can cause premature alternator wear.
• Never disconnect the battery with the engine running, as this can create voltage spikes that damage the alternator.

Ideal for performance builds, modified electrical systems, and vehicles requiring dependable charging under increased electrical load. The combination of a higher amperage output, direct bolt-in fit, and a robust black finish makes this alternator a practical upgrade for Subaru EJ20 and EJ25 platforms.