TROUBLESHOOTING for No Power! Older Ferrari's have Sony Car stereos
installed in the USA.
For No Power...
Check two fuses, (1)Constant +12v and (2)Switched +12v with ign. Bad fuse, you may have the problem.
Fuses good... Remove car stereo. Check for in-line plastic fuse holders, one end may be cracked and not allowing good connection - replace fuse holder with same value fuse.
Fuse holders good or possibly not present behind stereo. With Ohm Meter, check radio case to ground. Good ground, in Volt DC function, use case for ground and check Yellow (1) and Red (2) wires at back of stereo. Black wire is ground.
One or both voltages missing at back of car stereo. Trace Yellow and Red wires under carpet down right side of center console to the floor. Look for "Scotch Locks", they are used to connect two seperate wires together. (have you seen missing lights on boat trailers? Used here too). Remove, hardwire and wrap for better connections.
Powers check good at back of stereo.
Question first, when testing voltages at back of radio, was Case Ground or Original Ground used from step 3? Case Ground used and both powers present, this is a bad stereo, replace. Original Ground was used and both powers present? For fun, in Volts function using Original Ground, touch Case Ground with lead, meter should read 0v. *Rare occasions, +12v is present on case, check Ground (Black) wire along with power wires under carpet.
All Ferrari stereos seen in shop have
been Alpine, Sony or Blaupunkt. We presently do not have a large enough data base to list common problems with these systems.
They are aftermarket stereos.