What causes the radio to make a winding noise in sync with engine rpm on 2001 ford focus zx3?

The winding noise in your radio that is in sync with the engine RPM is likely caused by an alternator whine. This is a common issue with older vehicles and is caused by electrical interference from the alternator. The alternator is responsible for generating electricity for your vehicle's electrical system, and when it is not working properly, it can cause noise to be introduced into your audio system.

There are a few things that can cause an alternator whine, including:

* A bad alternator: If the alternator is not generating electricity properly, it can cause noise to be introduced into the audio system.

* A bad ground: If the alternator is not properly grounded, it can also cause noise to be introduced into the audio system.

* A loose connection: A loose connection between the alternator and the battery or between the alternator and the audio system can also cause noise to be introduced into the audio system.

To fix the alternator whine, you will need to identify the cause of the problem and then repair it. If the alternator is bad, you will need to replace it. If the ground is bad, you will need to clean it and make sure that it is properly connected. If there is a loose connection, you will need to tighten it.

Once you have fixed the problem, the alternator whine should go away.