Fitted a new stereo to mine last week but it was aftermarket before too. If you are stuck then tomorrow i can pull it out again and see what wires were what as they were all labelled. Lots of spare plugs back there though!!
if the plug has been cut off then just use a multimeter to identify the cables.
continuity test to find speakers then resistance test to check should measure 4ohms
continuity test to find earth by touching on car body work (when on the earth cable it will beep)
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