G3,G4 Alternator - 120 AMP - 1.9 Diesel

This high-output 120AMP alternator is a direct replacement for a wide range of Volkswagen 1.9 diesel engines fitted throughout the 1990s. Designed to deliver a stable 12-volt charge to the battery and electrical system, this alternator provides reliable output for vehicles running additional electrical accessories or modern upgrades such as improved lighting, audio equipment or auxiliary devices.

The alternator features a 49mm diameter belt pulley with 6 ribs, ensuring perfect compatibility with the factory multi-rib auxiliary belt system used on these engines. Inside, a heavy-duty rotor and stator assembly produce a consistent 120A charging current, while the built-in voltage regulator maintains stable system voltage to protect sensitive components. A worn or failing alternator can cause dim headlights, warning-light illumination, flat batteries, slow cranking or erratic electrical behaviour—issues immediately resolved with a quality replacement unit.

This alternator is built to meet or exceed OEM performance and is ideal for both standard maintenance and electrical system upgrades. We recommend checking the auxiliary belt, belt tensioner and mounting brackets during installation to ensure long-term reliability.

Technical Specification

• Charging Current: 120A

• Voltage: 12V

• Pulley Diameter: 49mm

• Pulley Type: 6-rib

Confirmed Vehicle Fitment

VW Golf Mk3 – 1.9 Diesel

• 90hp: Hatchback (08/1993), Convertible (08/1995), Hatchback (08/1995)

• 110hp: Estate (04/1996), Hatchback (04/1996), Convertible (07/1996)

VW Golf Mk4

• 1.9 Diesel Convertible – 90hp (06/1998)

VW Passat (3B, B3/B4)

• 1.9 Diesel – 90hp Saloon/Estate (1993–1997)

VW Polo Classic (6V2)

• 1.7D (57hp) – 07/1997

• 1.9 Diesel (110hp) – 06/1998

VW Sharan I – 1.9 Diesel

• 90hp MPV / Box Body – 1995–1996

• 110hp MPV / Box Body – 1996

VW Vento – 1.9 Diesel

• 90hp Saloon – 09/1993

VW Polo Variant (6V5)

• 1.9 Diesel (90hp / 110hp) – 1997–1998

• 1.7D (57hp) – 08/1997

This 120AMP unit restores correct charging performance and is ideal for keeping classic VW diesel platforms running smoothly.