Long story short i was driving home one day and listening to music, then all the sudden all audio went out. Head unit is aftermarket but it works fine. So i turned to the factory amp in the trunk, and I wanted to know how I can pass that and hook all factory and aftermarket speakers to amps. Please help.

 

Since you have an aftermarket head unit, it's super easy. Just install your aftermarket amps like in any other car and simply ignore the factory system. Run your own power, ground, RCA, and remote wires to the aftermarket amp, hook the speakers up with either your own wiring or stock, and you're done.