Electrical - partial electrical failure on 1993 Audi 90 Quattro

Car runs. Parking and brake lights OK. Radio plays.
All else electrically dead...headlights, turn signals, horn, window controls...

Asked by for the 1993 Audi 90 Quattro
I think you need to check the fuses first, then if that's no good, find an Audi specialist or an auto electric shop.
If you want to find a specialist, here's a directory link for you: