2006 Chevy Silverado Tail Light Wiring DiagramWith the Silverado lights on, test the pin on the truck 4-way connector that corresponds to the brown wire using the circuit tester (and be sure the tester is grounded). Then use a test light on the brown wire at the rear light junction box. Please refer to the included photo. Chevrolet Silverado - Wiring Diagrams Tesla TRANSMISSION Chevrolet Silverado Service & Repair Manuals