Stereo wiring!

Hi all,
Recently aqquired a 2000 plate K11 celebration. It currently has no stereo in, just the wires hanging out. I'm normally ok with sussing out the wires but this has me stumped. I have done some searching and I think the blue/black is 12v ign, and possibly yellow for permanent live, but I have no black wire for ground.
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Can anyone help please?
Rob
 
If you don't use the 3rd power wire (illumination) make sure it' isolated otherwise when you turn on lights you have a live wire down there and blow fuse losing parkers interior lights etc
 
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