Hey Scotty, I have a 2003 Infiniti G35. I recently bought the car and the owner told me all i need to do is get a new battery. I have the same exact car in automatic and i used that battery. Car turned on once but then after that it stopped working. It has No power whatsoever. No lights, cranking, nothing.. So far i changed the battery, Terminals and Most of the fuses. I did the Little ones, not the Big ones. The big ones look visually good. If you know the problem Please help.

be sure that battery has a full load first. then clean both battery terminals and connectors till they shine and pray it works then. if not, check for power loss between the battery and the ignition switch, and make sure the switch itself works