Dorman 645-903 Headlight Switch Connector

Headlight Switch Connector for GM Vans and Trucks

Dorman 645-903 is a headlight switch connector built to match the original connector’s appearance and function on specified applications. It uses quality materials for dependable electrical performance and long-term durability in GM lighting circuits.

Designed for vehicles such as the Chevrolet Express, GMC Savana, Tahoe, Yukon, and related platforms, this connector supports a direct repair for damaged or heat-affected switch wiring. The Dorman 645-903 headlight switch connector is a practical OE-style replacement for restoring proper headlight switch operation.

Key Features

• OE-style headlight switch connector for specified GM applications
• 12-way female terminal design with leads
• 16.4-inch wiring harness length for repair flexibility
• 10-gauge wire construction
• Blade terminals with tin brass terminal material
• Engineered for reliable electrical contact and durability

Detailed Description

This Dorman headlight switch connector is built for direct replacement use on a wide range of Chevrolet and GMC vehicles from 1995-2003, including Chevrolet Express, GMC Savana, Chevrolet Tahoe, GMC Yukon, and related C/K and Suburban models. It is also listed for Cadillac Escalade applications and select van and chassis platforms. The connector is made to match the original hardware’s fit and function, helping restore a secure connection at the headlight switch and dimmer switch circuit.

Part number 645-903 is a useful repair solution when the original connector shows signs of melting, corrosion, broken terminals, or intermittent lighting operation. This part cross-references Standard Ignition S-800 for the same application.

What It Helps Fix

• Headlights that flicker or fail due to a damaged switch connector
• Heat damage at the headlight switch wiring plug
• Corroded or loose terminal connections
• Intermittent dimmer switch or lighting circuit operation
• Broken connector housing or worn female terminals

Installation Notes and Tips

Verify connector style, terminal count, and vehicle application before installation. This part is listed for 12-way female connectors with leads and dimmer switch applications, so confirm the original harness matches those details. Inspect the surrounding wiring for heat damage or corrosion before splicing in the replacement connector. For best results, follow factory wiring diagrams and use proper electrical repair practices.

Quality Assurance

Dorman designs this connector to match original appearance and function on specified applications and manufactures it from quality materials for dependable service. Part number 645-903 is intended as an OE-style electrical repair component for GM lighting systems.