Hey guys, new to the Skyline discussion on your side of the ditch, so yeah, Hi!
To clear things up, these colours are what you will find on pretty much any of todays aftermarket stereos, they are universal.
Yellow - Permanent (battery)
Red - Accessory
Orange - Illumination
Blue or Blue/White - Remote
White - Front Left +
White/Black - Front Left -
Grey - Front Right +
Grey/Black - Front Right -
Green - Left Rear +
Green/Black - Left Rear -
Purple - Right Rear +
Purple/Blak - Right Rear-
If you dont use the rear speaker oututs due to no rear speakers, insulate them as they can short and hurt a stereo
Dont join colour to colour as the cars audio wires will never match your head units
foznice : if you need more specific details let me know
Hope this helps!