2012 Jeep JK Pully System High Pitch Electrical Wine

bpittman

New member

• Feb 14, 2019

• #1

I have replaced my serpentine belt x2 within a year, replaced water pump, both idler pully’s, drives fine, no codes, after 10min hilly terrain horrible high pitched electrical sound. Any ideas?

I uploaded youtube video with sound..https://youtu.be/2jLEG1u0RnI

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Last edited: Feb 14, 2019

JDDK

Member

• Feb 14, 2019

• #2

my idler pulley or tensioner pulley bearing went bad a while back. sounded like a funny car with the rev/whine. isolated it by using a piece of wood carefully against each part up to my ear until i figured out which one. watch out for fan

 

RockinAZJK

Caught the Bug

• Feb 14, 2019

• #3

Different vehicle but had my alternator dying on me in my old dodge and that’s what it sounded like


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W

WillysJkJeeper

New member

• Feb 14, 2019

• #4

Alternator bearins going out usally causes the noise ; take the belt off and spin the pully on the alternator see if it spins freely.