1976 Dodge Truck No power inside CAB

We have a 1976 Dodge D300 pickup that has no power inside the cab. It started fine, ran for a minute but died (it was cold) when I attempted to restart it, everything is dead-no ignition, no lights, no radio. Everything electrical inside the cab has no power. The battery is new and fully charged and there is power at the starter under the hood. At a loss where to look!