there are usually 2 fuses for the radio. If it has been stolen/cut, more than likely the thief cut all the wires at once blowing the one fuse that retains the memory (clock, radio stations, sound settings, etc.). Check your fuse panel, I'll bet you'll find at least one blown if not two.
On a side note, in testing for ground, make sure you turn the parking lights on. The parking light wire will actually show ground until you turn the lights on.
-There are 10 kinds of people. Those who understand binary, and those who do not.
-If we ever forget that we are One Nation Under God, then we will be a nation gone under...Ronald Reagan