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Brake Booster needs replaceing
Most likely, a bad fuel sending unit.
Check your fuses in your fuse panel usually that is what is wrong when cigarette lighters and radios quit working.
if your turning signal is not working it maybe the turn signal. it was like that in my 93
multi function switch in steering column
Something wrong with your alarm system, like not working maybe.
On the 2004 it is in the trunk on the Drivers side.
Does the power steering and a/c compressor use a common belt? Belt may be slipping or glazed
Keypad is battery operated on all Ford,Lincoln and Mercury vehicles.Batteries are NOT easily replaced.These units self destruct when opened.New units are available for about 75.00.
Its a bit of a job, but in order to do it correctly, you need to remove the alternator and water pump and then you will have clear working area to remove and install the A/C compressor.
I can't tell you how but I can say you have an electrical problem. There is something shorting out also there should be other accesories not working that are on the same fuse
yes horn is not working