Dear All,

I would very much appreciate if anyone could help me hooking my new Sony CDX-GT20 cd player in my 1987 Merc 190E. I Have installed new sony 4" speakers on the dashboard and will purchase and install rear speakers at a later stage. No problem there. The speakers are not yet connected to the cd player. Problem starts when trying to figure out how to connect the cd player. I can only see 4 cables coming out from the Merc: Red, Black, Brown and Grey. I have tried different options using the player's yellow and red cables but nothing happens. The radio simply does not fire up . Could anyone help please? Thanks in advance.