Galaxy Cd Changer

[trusty123]

found that the previous owner cut some wires to fit a sat nav,now have re solder all wires ,the block that goes into the amp,whixh are the main speaker harness.resolder the wires that comes from the 2007 ford cassette radio,which also sends signal to the cd changer.radio all works,buy the cd changer is dead,on checking the plug which goes into the changer,there is no live or earth,which tells me that either the wires have been cut somewhere else.or he have removed the plug.so my question is,where does the wires from the cd changer go to the front.can anyone help.thanks.