G3,G4 Alternator - 120AMP - 1.9 Diesel

This high-output 120AMP alternator is a direct replacement for a wide range of Volkswagen diesel and petrol models from the mid-1990s through to late 1999. Built to deliver reliable charging performance even under high electrical loads, this alternator supplies a steady 12-volt output and a generous 120A charging current—ideal for vehicles running heaters, auxiliary lighting, upgraded audio equipment or towing electrics.

The alternator features a 50mm diameter 6-rib multi-V pulley, ensuring correct alignment with the factory auxiliary belt system used across VW’s 1.7D, 1.9D, 1.9TD, 1.9TDI and select 2.8 petrol engines. Internally, a heavy-duty rotor and stator assembly provide strong, stable current across all operating speeds, while the integrated voltage regulator maintains consistent system voltage to protect ECUs and electrical components.

A failing alternator can cause battery-warning lights, dim headlights, slow cranking, flat batteries and intermittent electrical faults. Replacing the alternator restores proper charging performance and prevents unnecessary strain on the battery. We recommend inspecting the drive belt, tensioner and wiring connections during installation to ensure long-term reliability.

Technical Specification

• Charging Current: 120A

• Voltage: 12V

• Pulley Diameter: 50mm

• Pulley Type: 6-rib

Confirmed Vehicle Fitment

VW Caddy II

• 1.7D (57hp) – MPV / Box Body – 07/1996

• 1.9D (90hp) – MPV / Box Body – 09/1996–10/1996

VW Golf Mk3 – 1.9 Diesel

• 90hp Hatchback – 08/1993

• 90hp Estate & Hatchback – 07/1995 / 08/1995

• 90hp Convertible – 08/1995

• 110hp Estate & Hatchback – 04/1996

• 110hp Convertible – 07/1996

VW Golf Mk4

• 1.9 Diesel Convertible – 90hp / 110hp – 06/1998

VW Passat (3B / B3 / B4)

• 1.9 Diesel (110hp) – Saloon / Estate – 03/1996–10/1996

• 2.9 Petrol (184hp) – Estate – 01/1994

VW Polo Classic (6V2)

• 1.7D (57hp) – 07/1997

• 1.9D (64hp) – 12/1995 / 01/1996

VW Sharan I

• 1.9 Diesel (110hp) – MPV / Box Body – 09/1996

• 2.8 Petrol (174hp) – MPV / Box Body – 1995–1996

VW Polo Variant (6V5)

• 1.7D (57hp) – 08/1997

• 1.9D (64hp) – 06/1997

Construction Year Range: Up to 12/1999

This 120A alternator is the perfect upgrade or replacement for restoring dependable charging output across VW’s mid-90s diesel and petrol platforms.