73 Challenger Ignition

First meet with my 73 challenger didn’t go so well after a long haul from Kentucky to New Zealand. Battery fully charged. Key on. Interior lighta on. Power to dash. Head Lights work. Turn key to start. Everything goes dead. Engine doesn’t crank. Disconnect battery. Reconnect. Lights on again. Turn key to start and everything dies again. Any wisdom to point me in the right direction appreciated
Author: KiwiMopar