Is it completely dead? (no display or any noise/hiss from speakers?)
If so , check that the battery feed is OK to the radio.(using a multi-meter or a test lamp) If it is , then I suspect it means that the radio has blown.(you could try fitting it into another Ford or fit a spare Ford radio into yours ...if you have access to one?)
Remove the cover and visually inspect the components inside as quite often it will be an overheated resistor that has blown. There might even be a small fuse fitted inside.
Might be worth buying a replacement off Ebay?
RegWorts
August 2008