You could have a pump relay that is failing intermitantly. It is also called the main relay in most cases. If you listen closely when the key is turned to "ON" position you will hear a whirring noise which is fuel pump priming system.
You may alsohave an issue with ignition coil(s). They can be tested for resistance levels.
If the engine clicks without cranking, it is more likely to be a fault with the battery, starter or ignition switch.
Have the battery, alternator charging and ignition switch checked.
Ensure battery terminals are clean and secure.
Tuesday, December 13th, 2011 AT 6:56 PM