It is going to be a real challenge to diagnose a sound like that over the internet.

If you are concerned about the wiring harness, start by checking the physical condition of the wiring harness and see if it is showing any deterioration.

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Ali Al-Chalabi

2001 CLK55
1999 Dodge Ram 2500 Cummins Diesel
2002 Harley-Davidson Fatboy
Merlin Extralight w/ Campy Record