Standard Ignition DS-645 Headlight Switch

Headlight Switch for Select GM Vehicles

The Standard Ignition DS-645 headlight switch is built for direct replacement in select Buick, Chevrolet, and Oldsmobile applications. It uses a 12-volt design with a rectangular connector interface and blade terminals for a clean electrical connection.

Key Features

• Direct, snap-fit attachment method for straightforward replacement
• Headlight function switch for 12-volt systems
• 1 rectangular connector with no connector gender
• 6 male blade terminals for secure electrical contact
• Copper alloy conductors for strong conductivity and low resistive loss
• 100% tested for mechanical and electrical switching performance

Detailed Description

Standard Ignition DS-645 is a headlight switch engineered for service work where consistent electrical performance matters. The robust construction and copper alloy conductors support stable current flow, while the direct, snap-fit design helps simplify replacement in the dash-mounted switch location. This part cross-references Standard Ignition S2106 for the same application.

Compatible With 1993 Buick Roadmaster, N/A; 1991-1992 Buick Roadmaster, N/A; 1991-1992 Chevrolet Commercial Chassis, N/A; 1991-1993 Chevrolet Caprice, N/A; and 1991-1992 Oldsmobile Custom Cruiser, N/A. Search terms such as 1991-1993 Chevrolet Caprice headlight switch and 1993 Buick Roadmaster headlight switch DS-645 match this application set.

Common Issues This Part Can Address

• Headlights that do not turn on or off correctly
• Intermittent headlight operation from worn internal contacts
• Electrical resistance caused by degraded switch conductors
• Switch feel problems from mechanical wear in the original unit
• Failure of the dash headlight control on select GM vehicles

Installation Notes and Tips

Verify the connector style, terminal count, and 12-volt system before installation. This DS-645 uses a direct, snap-fit attachment with one rectangular connector and six male blade terminals, so matching the original switch layout is important for proper fitment. Confirm vehicle-specific notes such as w/o Twilight Sentinel on 1991-1993 Chevrolet Caprice and w/ Auto. Lights On/Off Delay on 1991-1992 Chevrolet Commercial Chassis.

Quality Assurance

Standard Ignition tests this headlight switch for both mechanical operation and electrical switching performance. The brand’s engineering focus and use of durable materials support consistent service replacement quality for Buick Roadmaster, Chevrolet Caprice, Chevrolet Commercial Chassis, and Oldsmobile Custom Cruiser applications.