Dorman 645-902 4WD Actuator Wiring Harness

4WD Actuator Wiring Harness for GM Trucks and SUVs

Dorman 645-902 is a plug-in 4WD actuator wiring harness that directly replaces the original harness on select GM trucks and SUVs. It is built with a plastic jacket and pin terminals for a straightforward electrical connection at the actuator.

• Direct replacement 4WD actuator wiring harness for select applications
• Plug-in design with pin terminals
• Plastic jacket for the harness body
• Fits vehicles with 5-way connector configurations
• Compatible with many Chevrolet, GMC, Cadillac, and Isuzu 4WD applications

Replacement Details

This Dorman 645-902 harness is used to restore the electrical connection between the vehicle wiring and the 4WD actuator. It is a practical replacement when the original connector is damaged, brittle, corroded, or no longer making a reliable connection. This part cross-references Standard Ignition S-753 for the same application.

Compatible With applications such as 2015-2016 Chevrolet Colorado, 2004-2012 GMC Canyon, 1999-2015 Chevrolet Silverado 1500, and 1997-2015 GMC Yukon. It also covers additional GM platforms including Cadillac Escalade, Chevrolet Tahoe, GMC Sierra, and related 4WD models. Dorman 645-902 is a direct-fit electrical repair part for vehicles listed in the fitment data.

Common Issues This Part Can Help Solve

• Broken or damaged 4WD actuator connector
• Intermittent four-wheel-drive engagement caused by poor wiring contact
• Corrosion at the original actuator harness plug
• Cracked or heat-damaged harness insulation
• Electrical connection loss at the front axle actuator

Installation Notes and Tips

Verify the connector style before installation, especially on 1996 models and earlier trucks that may have been upgraded from thermal to electric type. Confirm the vehicle uses the 5-way configuration shown in the fitment data. Inspect the actuator and nearby wiring for corrosion, bent pins, or damaged terminals before connecting the new harness.

Quality Assurance

Dorman manufactures direct replacement electrical repair parts for specific vehicle applications, and this harness is engineered to match the original connection style on the listed GM and Isuzu models.