Try to go online and get original schematic for your radio, this will save us a lot of time. A radio usually only needs one hot wire. With key on, check wires going to the radio with a test light. Can you find one that is "hot"? If no, then there is your problem, no juice. Removing the radio and working with it on the bench is helpful. Put 12v to it, hook up a speaker, plug in an antenna and check it out. Good luck.
