Dorman 645-931 Side Marker Light Socket - Front or Rear

Reliable Side Marker Light Socket for Ford and Mercury Vehicles

The Dorman 645-931 side marker light socket is designed to provide a secure electrical connection for side marker lights on select Ford and Mercury models. This socket ensures proper fitment and reliable performance for vehicles such as the Ford F-250 Super Duty, F-350, and Mercury Cougar.

• Overall length of 1.3 inches for compact installation
• Blade-style male terminals with tin plate material for corrosion resistance
• Designed without wire pigtail for direct socket replacement
• Compatible with Ford F-250 Super Duty, F-350, F-350 Super Duty, Transit Connect, and Mercury Cougar
• Non-water resistant design suitable for protected mounting locations

Product Details and Specifications

The Dorman 645-931 side marker light socket features a blade terminal design with male terminals made from tin-plated material, which helps resist corrosion and maintain a solid electrical connection. Measuring 1.3 inches in overall length, this socket is compact and fits securely in the designated side marker light housing. It does not include a wire pigtail, making it ideal for direct socket replacements where the existing wiring harness remains intact. While this socket is not water resistant, it is intended for use in locations protected from direct exposure to moisture.

Compatible Vehicles and Applications

This side marker light socket is compatible with a range of Ford and Mercury vehicles, including:

• Ford F-250 Super Duty
• Ford F-350 and F-350 Super Duty
• Ford Transit Connect
• Mercury Cougar

Using the correct socket ensures proper electrical contact and fitment, reducing the risk of lighting failure or intermittent connections.

Common Issues Addressed by This Socket

• Faulty or corroded side marker light socket causing intermittent lighting
• Damaged or broken terminals preventing proper electrical connection
• Loose or poor fitment of the existing socket in the side marker housing
• Replacement of worn sockets during side marker light bulb replacement
• Restoring electrical continuity in side marker lighting circuits

Installation Notes and Tips

When installing the Dorman 645-931 side marker light socket, ensure the vehicle is turned off and the lighting circuit is de-energized. Remove the old socket carefully to avoid damaging the wiring harness. Since this socket does not include a wire pigtail, connect it directly to the existing wiring terminals. Verify that the blade terminals are fully seated and secure to prevent loose connections. Test the side marker light operation before finalizing the installation.

Quality Assurance and Warranty

Dorman parts are manufactured to meet or exceed OEM standards for fit, form, and function. The 645-931 side marker light socket undergoes quality checks to ensure reliable electrical performance. While specific warranty details may vary, Dorman typically offers a limited warranty covering defects in material and workmanship. Consult product documentation for exact warranty terms.