Here's a strange one. Some a"£Ehole stole my head unit from my 1993 Classic. So I put a new stereo in but no sound at all..!!!! Wired a speaker directly to the stereo and got sound so no problems there (it's a Sony) and am wondering if there is an amplifier set up somewhere that I should be troubleshooting. There's nothing mentioned in my Haynes or workshop manual that I can find. Any help much appreciated and thanks in advance.