Help with radio (CDR-220) harness
 

New-to-me 1999 986 Boxster.
Radio didn't work - no display, no sound. Dead.
Fuse in the fuse panel checks OK.
Pulled the radio & fuse in the radio checks OK.
Switched power checks OK (with key on).
No power at "Constant 12V" line (thick red wire).
Is there another fuse somewhere?
Where can the other end of the red wire found?

Very old thread - I have similar issues
 

How did you solve this?