Sub Wiring

Anyone know of a way to isolate the factory sub so it can be hooked up to a supermarket stereo's rca's without running wire? It looks like it is just hooked up to the rear speakers?
 
Dude go to walk mart buy a $30 wire kit and do it right. Factory wiring sucks my mp3 had a 12 gauge power wire. It melted, and took a few other wires with it
 
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