Dorman 645-631 Wiring Harness Connector

Dorman 645-631 Wiring Harness Connector

Dorman 645-631 is a multi-purpose wiring harness connector built for electrical repairs and accessory installations where a clean, secure connection matters. It uses weatherproof terminals and a locking tab to help maintain a reliable quick-disconnect connection on a wide range of GM vehicles, including Chevrolet Silverado, GMC Sierra, and Buick Regal applications.

Key Features

• Multi-purpose pigtail connector for electrical repair work
• Weatherproof terminals for improved connection protection
• Locking tab helps secure the quick-disconnect connection
• Clean-installed appearance for professional repair results
• Direct-use connector style for common 2-way red wiring harness applications
• Cross-references Autolite 847 and Baldwin PT849 for the same application

Product Details

This Dorman wiring harness connector is designed for service work on vehicles that use a 2-way red wiring harness connector with leads. It is a practical replacement for damaged, brittle, or corroded connector ends on systems such as ignition coils and other electrical circuits. Part number 645-631 is listed across many GM platforms, including Chevrolet Equinox, Chevrolet Silverado 1500, GMC Sierra 1500, and Buick Regal, making it a useful OE-style repair part for technicians and DIY repairs.

Common Repair Uses

• Broken or cracked connector housing
• Corroded or loose electrical terminals
• Intermittent connection at a harness plug
• Damaged pigtail wiring during component replacement
• Electrical faults caused by worn quick-disconnect terminals

Installation Notes and Tips

Match the connector style and terminal layout to the original harness before installation. Use proper butt connectors and sealed splices when joining the leads, and verify terminal engagement after assembly. Confirm vehicle-specific fitment for your application, including 2017 Chevrolet Equinox, 2016 GMC Terrain, and 2011 Buick Regal listings where this connector is used.

Quality Assurance

Dorman designs replacement electrical connectors for serviceability and dependable fit in repair applications. Part number 645-631 is supported by broad vehicle coverage and interchange references, including Pioneer Automotive Industries S-1350, for application matching.