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...

1 answer
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:
https://repairpal.com/directory?address=27518&car_brand_names=Audi