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Both tail lights are driven by the same wire going back to rear of the truck. It feeds the rear truck harness wich feeds each side. The problem would appear somewhere between the harness plug under the rear of the bed and the right light. You should have a ground on one wire and 12 volts on the other one. Either will cause the light not to work.
Dave
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.
