ok, screwed around in there with a 9 volt battery, and heres what i got. you were right about the front two speakers, and you were probably right about the back two...but it doesnt matter. The back two speakers have new wiring stuck in there that i couldnt find before. After one blown fuse, I've found the 12 volt, the ground, and the antenna...but the radio still wont turn on

any ideas? And the black box was by music match. Good, bad, indifferent? Anyone?