stereo

Hey guys, 2014 Sentra. I just got a sub and amp setup and needed a new deck to use the RCA for the subs, I'm not a very patient person so rather than order a harness I went ahead and butchered mine thinking finding the diagram would be easy, well I was wrong. Can someone please help me out...

Does anybody have a wiring schematic/diagram for a 1985 Z (with external amp)? I have been googling for hours trying to figure out what the brown and brown/white wires are for and I can't find anything. I really appreciate any help.