Camaro_87

ok i bought a 87 z28 two weeks ago and it had no radio and the wires that came out of th edash were cu tan dmissing the connectors. so i purchased the correct connectors and found a factory am fm casstte radio on ebay. today i was hooking it all up i got power to the radio when i pushed the power button the power antenna would go up. then i tried connecting the speakers and thats where i must of did something wron becuase i went to plug the speaker wire in the radio and it kinda sparked on me and now the radio doesn't seem to work do you think i shorted out the radio or is there something else i did if so is the radio garbage now??

And does anyone have a diagram that shows witch wires go where for the radio and speakers??