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johnny · 09-22-2020, 08:20 PM

Have a 38 ford changed to 12 volt with alternator .The fan bolts to the pully on the end of the alternator .Special pully used .Trouble is ,there is a high pitched whine from the alternator .Have changed bearings ,used a larger front bearing thinking it was the bearing .Also thought the fan was puling the armature ahead into the bearing. Made sure the fan blades were running true. After all this, still no better .But disconnect the feed wire, The whine is gone. We now think there is some kind of electrical resonates causing the whine .So any suggestions to take the whine away.

09-22-2020, 08:20 PM	#1
johnny Senior Member Join Date: May 2010 Location: London On, Can. Posts: 377	38 ford alternator Have a 38 ford changed to 12 volt with alternator .The fan bolts to the pully on the end of the alternator .Special pully used .Trouble is ,there is a high pitched whine from the alternator .Have changed bearings ,used a larger front bearing thinking it was the bearing .Also thought the fan was puling the armature ahead into the bearing. Made sure the fan blades were running true. After all this, still no better .But disconnect the feed wire, The whine is gone. We now think there is some kind of electrical resonates causing the whine .So any suggestions to take the whine away.