CUSTOMER CONCERN Customer states the vehicle will not crank or start and nearly all electrical systems are inoperative after the 12-volt battery went dead. CAUSE Voltage testing found no power at the engine-compartment battery terminal, confirming the 120-amp DC/DC fusible link was open. CORRECTION Remove and replace 120-amp DC/DC fusible link. Inspect remaining power-distribution fuses and verify normal vehicle power-up and READY-mode operation.