Help ot there.
My radio was working fine then it started buzzing as I rev the engen and when it is stopped but with the ingition on the fule pump also transmits a buzz, so when I disconect the fule pump hot lead from the sending fule pump it stops. I know it is a simple fix, any ideas?
I just ran into this and it turned out to be a poor ground on my antenna. The ground on the radio was good but I still had a click/hum. Once I realized it only happened with the FM radio on, I made sure the antenna leads were connected properly and it all went away. Not sure if that is your problem, but maybe this helps.
So when I began searching for disconnected ground wires I came onto the left and right window regulator motor wiring of which I saw a problem so I started tearing out my window regulators to replace them with new ones and when I'm done I'm sure that that buzzing if it's still there will be easier to source
As strange as it may seem, radio buzzing can also be a symptom of a failing/failed voltage regulator. Watch the voltage gauge (if your car had one) when the buzzing is present. If the buzzing starts when the voltage drops below 12V, try replacing the regulator (internal in some Alfa alternators).