Standard Ignition DS-721 Headlight Dimmer Switch

Headlight Dimmer Switch for Buick Century and Regal

Standard Ignition DS-721 is a combination switch built for vehicles with cruise control and multi-function steering column controls. It is a direct-fit electrical replacement for select Buick Century and Buick Regal models, with switching performance verified through 100% testing.

Key Features

• Headlight dimmer switch with combination switch functions
• Bolt-on attachment with 3 rectangular connector cavities
• Male connector design with female blade terminals
• Includes turn signal control and windshield washer spray functions
• Includes windshield wiper delay and speed settings
• Includes cruise control cancel, on/off, resume, set, and speed adjustment functions
• Momentary high beam flasher and latching high beam operator included
• 12-volt new replacement part
• Standard Ignition DS-721 cross-references T Series DS721T

Detailed Description

The Standard Ignition DS-721 is a headlight dimmer switch and combination switch assembly engineered for reliable electrical control in select Buick Century and Buick Regal applications. It uses copper alloy conductors for strong conductivity and low resistive loss, while the robust construction and tested switching performance support consistent operation of lighting, turn signal, wiper, washer, and cruise control functions. This part number, DS-721, is a practical replacement for drivers servicing a Buick Century or Buick Regal with cruise control and combination switch requirements.

Fits 1997-2005 Buick Century, N/A. Fits 2004-2005 Buick Century, N/A, w/ Cruise Control; Combo Switch. Fits 1997-2004 Buick Regal, N/A. Fits 2004 Buick Regal, N/A, w/ Cruise Control; Combo Switch. Fits 1997-2003 Buick Century, N/A, w/ Cruise Control; Combo Switch Assembly. Fits 1997-2003 Buick Regal, N/A, w/ Cruise Control; Combo Switch Assembly.

Common Problems This Part Can Address

• Intermittent or failed headlight dimmer operation
• Turn signal control issues at the steering column
• Wiper delay or wiper speed selection problems
• Washer spray switch malfunction
• Cruise control switch input failure on the steering column

Installation Notes and Tips

Verify connector style, terminal count, and switch functions before installation. This DS-721 uses a bolt-on attachment method, a male connector with 3 rectangular cavities, and female blade terminals. Confirm the vehicle’s cruise control and combination switch configuration matches the listed Buick Century and Buick Regal fitments before replacing the original unit.

Quality Assurance

Standard Ignition builds this switch with durable materials and copper alloy conductors, then tests each unit for mechanical and electrical switching performance. The result is a replacement part intended to meet the demands of professional service work on Buick Century and Buick Regal steering column electrical systems.