I had a funny noise under the hood of my 89 Taurus that no one could identify. It varied with engine speed but could not be localized, even by a Ford technician that I respect. Finally on a trip through Nebraska I had an occasion to take the car into a Ford garage in Scottsbluf . I asked if anyone there might know what I had been hearing, one of their young technicians came over and pulled off the alternator connector. The noise went away. He explained that when a diode fails the unbalance in the alternator magnetic circuit causes the whine. About 6 months later the alternator had to be replaced and of course the noise was gone.

Val Sargent.

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