vc commodore stereo wiring

I want to install a new head unit into my vc commodore, however i have no idea which wire is which. Can someone tell me which wire is which

use a test light connected to negative and touch every wire with the ignition off the wire that makes the test light go on is constant/Memory wire. once done turn the ignition on and touch the other wires when it lights up that is ignition power/mains then attach the TL to the mains and touch the wires again and it will light up on the negative. all you have to do now is attach the wires and speakers