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...

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