I've wired in a few stereo's in dune buggies and whatnot. Where there is no harness to plug into. If you want to "engineer" your own, try yellow as a constant(battery), red as an ACC(ignition), and black as a ground. Your colored wires (green, purple, white, and gray)and colored with a black stripe wires are speaker wires, the striped wires are negative and should be hooked up to the little prong if you can't figure out where it goes, if you reverse them you'll have no bass(not a bad idea id you can't afford bass blockers for your tweeters)blue is a remote for an amp and orange is for a power antenna. The easiest way to find out what wires work what speaker is to hook it up to a speaker and play with the balance/fade. If that doesn't work check the fuse in the head unit itself. This might not be how yours works, but it's been that way in all the ones I've done, trust me I've done my fair share.