2006 ford mustang will not start, Only makes a clicking noise?

usually if your lights and radio come on but you hear a click when tryin to start the vehicle it is 9 times outta ten yer starter has gone out. the clicking is yer starter solenoid tryin to engage your starter but cant. try this...get a friend to try and crank your car, find your starter and tap on it with a hammer. if it tries to crank your starter is bad...if you still beleieve it to be a battery problem take it to your local parts store that does battery load tests and have it tested...hope this helps

You are having a problem either with the starter, the starter solenoid or a bad connection somewhere in the cables connecting the battery voltage to the starter. If it is a manual, you can try to coast start it. Next step is to disconnect the battery and charge it, and while it's charging, do a good cleaning job on the ends of the cables with a wire brush. Last choice is a bad starter, and that's the most expensive option, so try the others first.

9 times out of 10 it's caused by corrosion between the battery post and cable end, take the cable off and get a post cleaner and clean the post and cable end real good... it looks like a pointy wire brush... The corrosion won't let the battery take a charge, so it's dead and needs charging too.. this is the first thing you do because it's the cheapest..