help on head lights

my drivers side head light has been wired by some idiot before i had the car and it just doesn't work apart from full beam, could someone tell me what colour wire goes in what part of the plug,
it has 3 wires,
black,
red+green
red=yellow

and the plug has 3 smaller sockets one at the top and 2 to the side,

could someone just have a look at there's and see what wire goes where :D
its a 1.2 1991 gsx if that helps :) thanks lads.
 
socket_wiring_diagram.jpg
 
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