sat-nav wiring

hi all i have a original 2000 p38 wiring loom for sat nav but coudnt identify which is the speaker wire there is two wires one is yellow and one is yellow/brown anyone know for certain which one ?? as i dont want to blow the sat nav up ,, in anticipation thanks very much ,any help or pointers would be helpfull ..regards MOZZ

hi, could rave have those wires meanings?
http://www.landyzone.co.uk/lz/f10/p38-sat-nav-install-52864.html
does this helps any