car audio/wiring help asap

ok…got it hooked up. i found a screw to ground it to, so that was easy. im about ready to lose it with this damn thing. the only wire i could find was a single conductor 18 gauge. i had everything running and all. it recognized the “cd changer” (ipod) and saw that something was there. so i was like sweet it might work. then i went and got my ipod. plugged it in and it did not recognize it. now wtf. i must have blown a fuse somewhere because my 12v dropped out now. anyone know where i can get a diagram of the fuse box? i didnt see any burned out fuses, but i dont want to go pulling out all the fuses…thats probably not a good idea right?

any suggestions?