Check for power on the light blue wire at the master window switch. If there is power than I would suspect an internal failure of the switch.
If there is no power than pull the 30 amp circuit breaker and make sure there is power on one of the pins. If there is than there is an open circuit between the circuit breaker and the door. The likely place for this is a broken wire in the door harness in between the door and the body of the truck.
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