Quote:
Originally Posted by brucemillar
What you describe is ground loop whistle. Give it a GOOGLE you will see lots of suggestions on how to correct it. On my 4.8 it was the output transistors on the BM54 radio in the trunk.
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Brilliant, thanks for the pointer Bruce! I think I know what caused it as I had recently worked on my audio system. I never used to have this noise.
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'05 E53 X5 4.4i, '97 E39 528, '07 E92 335i, '16 F86 X6M.
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