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turns out it wasn't alternator noise, but noise coming in on my antenna.  I have a 2006 Ford F150 and I have since found out that the Fords are notorious for fuel pump noise.


am going to ground the daylights out of this truck when it warms up a bit.  probably a couple from the bed to the frame, cab to the frame, exhaust to the frame, and whatever else I can think of.