Thanks.... kind of...... I did find this and it looked promising..... but....
I need to know the numbering order on the socket.
The problem is the socket that plugs in is quite large but densely packed, it's impossible to see which wire goes to which pin.
It wouldn't be a big stretch that the tiny pins top left are the speaker signal pre-in (small current) from the head unit........
And the thicker pins underneath are the loudspeaker out (larger current)
The wiring loom connections are so tiny that I'm struggling to get a multimeter in them.....
Hey ho, it's not rocket science.......... but very, very frustrating!