Dorman 645-668 Tail Light Repair Harness Connector

Tail Light Wiring Harness Connector for GM Applications

Dorman 645-668 is a tail light wiring harness connector built for clean electrical repairs and accessory installations. It uses weatherproof terminals and a locking tab to help maintain a secure quick-disconnect connection, with a neat installed appearance.

• Tail light wiring harness connector with 4-wire, female terminal layout
• 16.14 in. harness length with 20-gauge wire
• Weatherproof terminals for exposed rear-light locations
• Locking tab for a secure quick-disconnect connection
• Black square-fit connector style for listed GM applications

Detailed Product Overview

This Dorman tail light repair harness connector is used on a wide range of Chevrolet, GMC, Buick, Cadillac, Pontiac, Saturn, Saab, Hummer, and Oldsmobile vehicles. It is a direct-fit electrical connector for rear lighting repairs where the original tail lamp plug is damaged, corroded, or no longer locking properly. This part number, 645-668, is also referenced by Standard Ignition S-912 and Champion Spark Plug 954 for the same application.

Vehicle coverage includes long-tail search applications such as Fits 2008-2011 Chevrolet Silverado 1500, N/A; Fits 2008-2011 GMC Sierra 1500, N/A; Fits 2006-2010 Chevrolet Malibu, N/A; and Fits 2006-2009 Chevrolet Trailblazer, N/A. It also applies to many other listed GM models from 1996 through 2017, including Equinox, Terrain, Tahoe, Yukon, CTS, DTS, and Grand Prix.

Common Repair Uses

• Broken or brittle tail light connector housing
• Corroded or heat-damaged rear lamp terminals
• Intermittent tail light operation from poor terminal contact
• Failed locking tab that no longer secures the plug
• Electrical repair after rear lamp service or body repair

Installation Notes and Tips

Match the connector shape, wire count, and terminal style to the original harness before splicing. The 4-wire, female connector design and square fitment are important for proper alignment on the listed vehicles. Verify the vehicle-specific notes in the fitment list, especially applications marked for power liftgate or fuel pump motor use, before installation.

Quality Assurance

Dorman designs this connector for reliable electrical repair service with weather-resistant terminals and a locking connection point. It is intended as a replacement-style connector for the listed GM applications, including Chevrolet Silverado 1500, GMC Sierra 1500, and Chevrolet Equinox fitments.