Standard Ignition DS-40 Headlight Dimmer Switch

Headlight Dimmer Switch for Classic GM and Jeep Applications

The Standard Ignition DS-40 is a floor-mounted headlight dimmer switch built for older vehicles that use a 12-volt electrical system. It is a direct-fit style replacement for many classic Buick, Cadillac, Chevrolet, Chrysler, Oldsmobile, Pontiac, and Jeep applications, including models such as the Chevrolet Bel Air, Corvette, and Cadillac DeVille.

Key Features

• Floor-mounted headlight dimmer switch design
• Bolt-on attachment method for straightforward installation
• 12-volt electrical specification
• 3 male blade terminals for secure electrical connection
• Silver color with cast iron finish
• Copper alloy conductors for strong electrical conductivity and reduced resistance
• 100% tested for mechanical and electrical switching performance

Detailed Description

Standard Ignition DS-40 is engineered for service replacement in vehicles that rely on a floor-mounted dimmer switch to control high and low beam operation. The robust construction and copper alloy conductors support consistent current flow, while the tested switching performance helps maintain dependable headlight control in daily driving and restoration use. This part cross-references Delphi TC6744 for the same application.

Compatible With classic fitments such as 1950-1958 Buick Roadmaster, 1954-1958 Buick Century, 1953-1958 Cadillac DeVille, 1950-1957 Pontiac Catalina, and 1970 Jeep Wagoneer. The Standard Ignition DS-40 also serves applications including 1950-1954 Chevrolet Bel Air and 1953-1954 Chevrolet Corvette, making it a practical choice for vintage lighting repair.

Common Problems This Part Can Help Solve

• Intermittent or failed high/low beam switching at the floor pedal
• Headlights that stay on one beam setting
• Electrical resistance caused by worn internal contacts
• Loose or unreliable terminal connection at the switch
• Dimmer switch wear in restored or regularly driven classic vehicles

Installation Notes and Tips

Verify the vehicle uses a floor-mounted, bolt-on dimmer switch with 3 male blade terminals before installation. Confirm 12-volt system compatibility and match the connector style to the existing harness. For best results, inspect the surrounding wiring and terminals for heat damage, corrosion, or looseness before replacing the switch. Fits 1950-1958 Buick Roadmaster, 1954-1958 Buick Century, 1953-1958 Cadillac DeVille, 1950-1957 Pontiac Catalina, and 1970 Jeep Wagoneer.

Quality Assurance

Standard Ignition builds this switch with durable materials and tests each unit for mechanical and electrical function to support reliable service in demanding automotive applications.