How to diagnose faulty wiring in an Audi 80?

I have been experiencing intermittent electrical issues in my Audi 80. The lights flicker and the radio turns on and off randomly. How can I determine if the issue is with the wiring and how can I fix it?

The first thing you should do is check the battery and the alternator. Faulty wiring can often cause these components to malfunction. If they appear to be in good working condition, then you will need to check the wiring itself. Look for any signs of damage or wear and tear. If you find any, then you will need to replace the affected wiring.