bench testing a radio

I've got a pile of Corvette and other GM radios, but I have no idea how to test them.
Can anyone tell me what I need and how to do it?

GO TO RAIDO SHACK AND BUY A PIGTAIL FOR THE YEAR VETTE YOU GOT THE RAIDO OUT OF ,, THEN PUT A BATTERY ON YOUR BENCH, BLACK GOES TO GROUND,YELLOW AND RED GO TO POS+ SHOULD MAKE RAIDO WORK, WHEN YOU BUY THE PIGTAIL WILL HAVE DIAGRAM IN PACKAGE, HOW TO HOOK UP,