Classic dead battery. 2005 Ford Mustang GT's had an issue killing the batteries prematurely. Seeing that this is 2010 and you have a 2005, you probably didn't suffer from that, but simply have an old, dead battery.
Try cleaning the cables and battery posts then if you have a jumper cable set put the positive -red cable on the positive side of the battery next put the other end to the opposite side of the starter relay if the starter cranks over then you need to replace the starter solenoid cost $15.00 at any parts store. if that does not do the trick try to get another car and hook the battery cables up to the other cars batter hook the ground cable to ground and then take the red positive cable and touch it on the opposite side of the starter solenoid if it then works it means your battery is discharged and you will have to take it to auto-zone and have the battery charged and tested, they do this for free then have a load test done on it if it is ok then your charging system is not working. Then the last thing is the starter is bad, but that's the last thing to check as it is the most expensive.
Battery is too weak to fully turn the motor over or your starter is going bad.
SOURCE: 2005 Ford Mustang GT -loud clicking noise in audio system
There is a possibility that the cellular phone is interfering with the audio system. Cell phones communicate on their own with cell hubs to change locations, or to receive mails. Try to place the celular in a different position, or to turn it off on a single trip to see if the clicking disappears.
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