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I reread the thread and I have exactly the same problem Rob G had. Just like for him, it started one day* and now it's always there the moment I turn on the engine. There is no hum on the radio when the engine is off. The pitch changes as my RPM change.
I looked at the ground on the radio itself and the one in the front on the passenger side. It doesn't appear to be along the hood shock going to the hood but on the inside of the fender - at least if I found the right one. I looked also at the alternator but the cables I saw looked ok.
The ground on the radio could be the culprit. Instead of a shielded cable, it has a piece of metal in an L shape with multiple holes in it. On one side it is attached to the radio's ground cable entry via a shrew through one of the holes and on the other side it is shrewd to what appears to be the ground on the chassis under the dashboard. The metal is not shielded and lots of cable run around it. I wonder if that causes it.
Didn't get to do it today but I'll get a shielded cable with an eye opening on both side and replace the metal.
* If I recall correctly that "one day" might have been the day I took out the radio to check the connections since I had a problem with the speakers and not proper channel mapping. It could be that I did change something with the ground that now causes this sound.
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