I'm trying to connect all the speakers to the pos deck on the Blazer I just bought. I see these under the dash: tan ? gray? light green? dark green? orange/orange black? skinnier gray? black- ground? yellow- power blue- right rear brown/yellow- left rear On the deck it has 4 speaker wires and a wire that says common speaker ground plus a power wire. So I hook up all the ground speaker wires and the black ground to this? Thanks.