I have a 05 Crysler Pacifica that wont start. There is clicking noise but not sure where its coming from. And it's reading thats its in all gears. My uncle has tried everything he can think of and nothing works. The security light is on but it stays on unless the car is running.

 

Clean battery posts and cable connections, and then check for CLEAN and tight ground connections from the battery to body and motor.
How old and what condition is the battery in? Any work done on the car before this problem happened? Go back and check that work for anything electrically left loose.