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My truck has 94k miles and I just notis this noise.sounds like a winey ford ps pump.but go's away when it worms up or the battery comes fulley charged.I tryed a rebuild alt. and its better but still there.My co-worker said it sounds like its under the left valev cover.Yes its s/c and I turned the s/c'er pulley and the ldler and both smooth.They tested my old alt. and it sounded good under a heavy load test but i replaced it anyway.Tomorrow i will have time to take the belt off and try that.I dont hear it at idle but just off idle like 1500-2k.it still run good.but its a Toyota.Help please?
 
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