I have another off brand car. 1959 nash. i want to convert the original radio to am/fm mp3 and so on. There is one man who converts these, but I'm wanting to build my own. Does anyone have or know where to get schematics to do this conversion. Thanks Frank
https://www.vintagecarradio.com/stereo-conversions.html - nice write up http://www.tech-retro.com/Aurora_Design/Home.html or you can do what I did: http://www.v8buick.com/index.php?threads/another-radio-post-with-a-twist.347930/