Trying to find which wires to wire in the RCA converter for an amp to the stock head unit of an 04

 

I can't tell you right off hand, but on all four speakers, the DARKER COLOR is the negative and the lighter color is the positive. YOu'll not be a ble to wire your converter using the wires coming off of the stereo because GM has started to use one wire to do multiple functions, therefore the few amount of wires in the stereo harness. YOu'll have to go to the speakers and check the colors of the wires running from them OR do what I did, make it easier and safer and go buy an install harness kit, a pain in the *** to pay $40 for, but NO screw ups and makes the install clean and everything still works great. All the relays and everything are wired into the harness to allow all the factory functions to still operate. Either way is fine, depends on if you wanna spend the $$ or not, and I usually don't but with the way GM is starting to do their wiring, I'm going against chopping anything anymore...not like the old days where everything was one color and you knew what it was and what it did and where it went! Hope this helps, not confuses!!

 

Why use an RCA converter, just use the damn line level inputs on the amp, should have come with a harness for that.