T25 Headlight Switch - 1979-89 (Also G1 Headlight Switch - 1974-80)

High quality replacement headlight switch with 8 terminal connection, designed to control exterior lighting and dashboard illumination on a wide range of classic Volkswagen and Porsche models.

This switch combines both rotary and push functions, allowing you to operate sidelights and headlights while also incorporating an integrated rheostat to adjust dashboard illumination brightness. This ensures clear visibility of instruments at night while maintaining period-correct functionality.

The internal rheostat works by varying electrical resistance to the dash lighting circuit. As you rotate the switch, it increases or decreases current flow, dimming or brightening the instrument lights accordingly. This is especially important for night driving comfort and reducing glare.

Built with an integrated regulator and robust internal contacts, this switch is designed for long-term reliability. It provides consistent electrical performance and smooth operation, making it ideal for restoration projects or replacing worn, faulty original switches.

Important Note:
Not suitable for Volkswagen Transporter T25 models fitted with dim-dip sidelights. Please check your vehicle specification before ordering.

Features

• 8 terminal electrical connection
• Integrated rheostat for dash light dimming
• Rotary and push operation
• Controls sidelights and headlights
• Durable internal components for long service life

Specifications

• Actuation: Rotary & Push
• Switch function: On/Off
• Supplementary info: Integrated regulator
• Terminals: 8 pin

How It Works
When pushed, the switch activates the vehicle lighting circuits (sidelights and headlights). The rotary function adjusts dash illumination via the built-in rheostat, allowing fine control over brightness. This ensures both safe exterior lighting operation and comfortable interior visibility.

Recommended Additional Parts

• Headlight relay (to reduce load on switch)
• Wiring connectors and terminals
• Dash bulbs (if upgrading lighting)
• Fuse box components (if original system is aged)

To Fit

Watercooled VW

• VW Golf Mk1 – 1975–1980 – from chassis F 176 3000 001
• VW Golf Mk1 Cabriolet – 1979–1980
• VW Jetta Mk1 – 1979–1980
• VW Scirocco Mk1 – 1974–1981 – from chassis 536 2000 001 to 53-B-050 000
• VW Passat B1 – 1973–1980
• VW T25 / T3 Transporter & Vanagon – 1980–1989 – up to chassis 24-K-086 200, excluding dim-dip sidelight models

Porsche

• Porsche 924 – 1976–1978 – 2.0 petrol, LHD models only
  Porsche equivalent part number: 321941531A