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rob
if the humming is in sync with the rmp levels chances are you have a bad ground somewhere. what brand radio do you have? do you use an external amplifier?
twj
while i am no expert on early 911 electrical systems i do know quite a bit about mobile audio. if i were in your situation i would try running new power and ground as you suggested. this will be the cheapest and easiest way to test for a bad ground. you could even go so far as to just run both lines to the battery terminals to limit any other potential causes. if that solves the problem then you can properly run new wires as needed. if it persists i would try to temporarily connect the new/old blau into another vehicle to see if the whine is present.
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