My name is Dale.
I will be happy to send the information for you on any of these 3. Otherwise I think you are going to need a Master Service Manual. Here is a link to a manual I found on EBay: http://cgi.ebay.com/ebaymotors/1980-1981-1982-1983-Audi-4000-COUPE-Service-Shop-Manual-_W0QQcmdZViewItemQQhashZitem27ba1419e9QQitemZ170625604073QQptZMotorsQ5fManualsQ5fLiterature
PS- It sort of looks like the 4000 covers the coupe but I am not sure. Do you know?
After a bit more research it appears that the 4000 Series is the same as the Coupe.
Here is a link to the wirng diagram for that vehicle.
I certainly hope it helps you and you accept my answer because it took a lot of research to find the schematic.