I have 350 miles on my xpt 4 and I’m struggling with a wierd noise. It sounds like a electrical noise almost like feedback from a microphone. Around 18 mph and up it starts buzzing sounds like front of vehicle. It’s at the dealer right now and of course they scratched their heads when I took the service writer for a test drive so he could listen to it. I thought it was feedback from my Fosgate stereo but I completely unplugged that and it stills humms. Only after market thing left that’s hooked to electrical system is rigid light bar and kfi winch. I guess it could be powertrain related but my 20 years of being a mechanic tells me it’s electrical noise. Anyone else have any similar issues?

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