How do I troubleshoot the electrical issues in my Ford S-Max?

I have been experiencing some electrical problems with my Ford S-Max lately. The dashboard lights flicker, the windows sometimes don't roll down, and the radio turns on and off by itself. Can anyone provide some advice on how to troubleshoot and fix these issues?

It sounds like you have a faulty battery or alternator. You should get them checked and replaced if necessary.

Check all the fuses and relays. Poor connections or blown fuses can cause these electrical issues.

Have you recently installed any new aftermarket electronics such as a stereo or alarm system? They could be causing interference with the electrical system.