To hook up trailer lights on a 2003 GMC Sonoma, first locate the trailer wiring harness connector, usually found near the rear of the truck, often under the bumper. Use a wiring adapter that matches your trailer's plug type (typically 4-pin or 7-pin) and connect it to the harness. Secure the connections and test the lights to ensure they are functioning properly. If needed, consult your vehicle's manual for specific wiring diagrams or troubleshooting tips.
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