So I pulled out my stock deck (tape and radio and then the cd player below it) and unplugged all the wires from both of them. My audio system is the 4 speaker one not the mach version. So I went to Futureshop and got the harness it was $20. So I plugged everything in;solder all wires and the new deck powers on; but no audio out of speakers. So I bring over a speaker and hook one of the speaker wires from the head unit to it and the speaker works. So something to do the with the harness? I tried 2 of the same one. Any ideas from others?