[db86na]

im having some problems with my fc ive replaced the battery , ignition switch ,main relay , and almost all my fusses. my idiot lights will not come on or will the car click or crank ,all i have is hazards and head lights and this door beeper, i am getting 12.46v to the ignition switch but when i turn the key to start it goes away. i know it sounds like a bad ignition switch but i have tried 3 of them now and one was from a running car. what should i check next