Alfa Romeo Repair: ICS audio systems problem of my 166, radio connector, negative cable

Question
Thanks for your answer. But unfortunately, there's no alfa romeo A/S center in korea, and I am not expert to repair. Would you please let me know about positions of ICS connectors and radio connector and cassette connector and CD-player connector? and what is that mean to touch negative cable to positive terminal? Is it about battery's negative lead? Do you mean for me to connect battery's negative lead with positive lead together?
Thanks for your help again.

Answer
First: yes, I do mean to touch the positive cable with the negative cable--with nothing connected to the negative terminal of the battery.

Second: any shop that really understands electrical problems can do what I described.  Do not do it yourself as experience with connecters is required.

Third: I am in California and do not have access to Alfas newer than 1996.

By the way--could you have missed something in the radio instruction manual...