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When you disconnect your battery and then reconnect it again, it disables the radio. This is an anti-theft protection for your car radio. The enable your radio the activation code is in your vehicle owner's manual. If you do not have this code you need to go to your Ford service centre and get them to enter this code for you.
If your radio has anti-theft system you will have to go to the dealer and get the accss code to reactivate the radio if you dont have the code already. GM vehicles with anti-theft radios will lock when power is lost to the system if the radio is not turned off prior to battery disconnect or dying.
I don't think you will find this online; the dealer can find it for you but probably won't do it free.
If you lost the radio because of battery change or disconnect, you can prevent this from happening again with a cheap, simple device that uses a standard 9 volt battery and your cigarette lighter/power jack, to supply 'keep alive' voltage while disconnecting the main battery.
Auto parts stores carry them.
I have seen this before, You should pull the radio out and get the serial number off of the back. Call your dealer and get the radio code. Disconnect and reconnect your battery and input code given by dealer. Usually this occurs when you change or let the battery rundown, it is an antitheft feature. Most of the time you would lose all functionality but in your case there may have been some kind a electrical surge that tripped part off your radio functionality. Please let me know if this works for you.