I have a 2004 v6 mustang and it won't start. When I turn the key all I hear is a clicking sound. The battery died last week so I replaced it. Last night I tried to start my car and it wouldn't start. The radio and dome lights all turn on but the car wouldn't turn over. I have replaced the battery and now the alternator. When I put the key in the ignition and turn it (not all the way) the radio and all lights come on. Once I turn the key all the way I hear a clicking noise and everything goes dead. I'm at a loss as to what else I am needing to do. Any help would be GREATLY appreciated!!!!!!!!!!