I been puzzled by this for a week. I have looked all around and have not found the answer. Car guruand all that is a rip off. Pay $10 for someone to tell you to take it to a mechanic! No thanks, kinda defeats the purpose in their website! So My car just clicks with no turn over. Not the battery, and not the starter. Not the ignition switch, non of the relays. So I have and extra battery. I take it out to the car, and try to jump it. Even though I know the battery is good. I have tested all the wires also at this point. As I hook up the jumper cables I accidentally drop the hot on the engine. I tried grabbing it up real quick because I figured it would spark. But guess what, NO SPARK! I take the hot and touch it all over the engine, NO SPARK! Then it hits me! So I take the negative clamp and clamp and clamp it to the ground on the battery, then straight to the engine block hook. Get in the car and it starts right up. Bad ground! I spent alot of money and hours. I hope this helps others. $8 fix for a ground wire from battery to block.