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Just get a PAC AOEM-MAZ2 interface harness. Then not only do you not have to guess, you don't need to cut into any wires at all, either. It's a straight plug and play t-harness that gives you RCA outputs.
 

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If you don't have an amplifier (except for the head unit) why not just see what color the wires are at the speakers and back trace those to the head unit?
 
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