Rance,when you hear the noise,remove the neg. Battery cable or remove the plug on the regulator and it should go away.If the noise does go away,have your alternator checked for a bad diode.You do have the old style round diodes pressed into the heat sink in the back of the alternator don't you ? Let me know what you find.You might want to go with a later one wire alternator with an internal regulator and be done with it.


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