How to Fix a Non-Functioning Headlight in an Audi 80?

Despite replacing the bulb, my Audi 80's headlight still won't turn on. What steps can I take to troubleshoot and fix this issue?

First, check the fuse for the headlight to make sure it is not blown. If it is, replace it with a new one and test the headlight. If it still doesn't work, try checking the headlight relay and replace if necessary.

Make sure there is no corrosion on the headlight connections. If there is, clean it off with a wire brush and reconnect the wires. This should fix the issue, but if it doesn't, it may be a wiring problem and you may need to take it to a mechanic.

Inspect the headlight switch to see if it is broken or worn out. If it is, you will need to replace it. Additionally, you can use a multimeter to check that the headlight switch is getting power when it is turned on.