My husband is working on his brothers C-100.  He owns a business for automotive electrical repair.  Here comes the odd part.  When he went to repair this radio, he figured how hard can it be since he's literally worked on many hundreds of radios in the past.  Well....he figured black is ground and put power to the radio with this assumption.  He soon found out this is wrong and blew a ton of ic chips and the such.  He has replaced them and now cannot get the radio to work! The original problem is the stereo output stopped working. 

Can someone please help!! This is his brothers pride and joy and he will not be pleasant if we cannot fix it!!

Thanks!

Check for low ohm resistors (usually 1 ohm) as they are often used as fuses. You may get lucky.

Also there should be a reverse polarity protection diode.

Do fix them and can more likely get it working, as have the equipment, but not cheap, as expensive to ship and time it take to trace the problem, he more like blew a diode, fusable resistors, or regulator, plus will have to change the electrolytic capacitors as ESR value goes up, due to age and capacitors leak as seal goes bad, so is a must. And have to see what going on with the amp section, if ouputs are defective, or caps. How did he know if he blew the IC chips?