Standard Ignition DS-747 Headlight Dimmer Switch

Headlight Dimmer Switch for Ford and Mercury

Standard Ignition DS-747 is a new headlight dimmer switch built for direct replacement service on select Ford Thunderbird and Mercury Cougar applications. It combines headlight dimmer, turn signal, windshield washer spray, and windshield wiper speed functions in one column-mounted switch assembly.

Key Features

• Part number DS-747 headlight dimmer switch
• Bolt-on attachment method with black plastic finish
• 3 female rectangular connectors
• 19 blade terminals for electrical connection
• Combination switch with indicator markings included
• Latching high beam operator and momentary high beam flasher included
• Turn signal control included
• Windshield washer spray included
• Windshield wiper speed setting included
• 12-volt electrical design

Detailed Description

Standard Ignition DS-747 is engineered with copper alloy conductors for strong electrical conductivity and reduced resistive loss. The switch is 100% tested for mechanical and electrical switching performance, and its robust construction is aimed at service replacement use where consistent operation matters. This DS-747 headlight dimmer switch is a direct-fit style solution for vehicles that use a column-mounted combination switch layout.

Compatible With 1989-1993 Ford Thunderbird, w/o Auto Headlight Dimmer; 1990-1993 Ford Thunderbird, w/o Auto Headlight Dimmer; Column Mounted Switch; 1989-1993 Mercury Cougar, w/o Auto Headlight Dimmer; and 1989-1993 Mercury Cougar, w/o Auto Headlight Dimmer; Column Mounted Switch. This part cross-references Standard Ignition DS-747 for the same application.

Common Replacement Reasons

• Headlights do not switch between low and high beam correctly
• Turn signal or combination switch functions stop responding
• Windshield washer spray or wiper speed control becomes intermittent
• High beam flasher or latching beam operation fails
• Electrical switching feels loose, inconsistent, or worn

Installation Notes and Tips

Verify the vehicle is equipped without auto headlight dimmer before ordering. Confirm the connector style, terminal count, and column-mounted switch layout against the original part before installation. Because this DS-747 uses a bolt-on design, proper alignment and secure electrical connection are important for reliable operation on Ford Thunderbird and Mercury Cougar models.

Quality Assurance

Standard Ignition builds this switch with service-grade materials and tests each unit for both mechanical action and electrical performance. The copper alloy conductor design supports stable current flow, and the new construction is intended to meet the demands of professional repair work.