hey does ne one know where i culd find a wire diagram for an alpine 7904, i got myn from a buddy cuz my other one has a cracked face, and i am not shur on how to decifer the wires for speakers so it werks, i got the fuse black and red one done and it gets power i jus need to know which wires are for speakers and what not, and do you know how old this head unit is???? thanx peace