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Unread 08-22-2013, 02:57 PM   #1
Dickpalmer
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Join Date: Dec 2011
Posts: 103
Alternator chirping.

I pulled in the driveway yesterday and noticed a pretty loud chirping sound. Went to my buddies and he got out the long stethoscope. He said the alternator was really noisey. I ordered a new alternator, should be here sat. or mon. Today the check engine light came on but the voltage didn't seem low. Coincidence?

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Unread 08-22-2013, 03:06 PM   #2
Holder350
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1995 XJ Cherokee 
 
Join Date: Oct 2007
Location: Whitesburg, Tennessee
Posts: 5,291
A chirp could indicate failing alternator bearings, or a belt that is loose or old and hard.

A check engine light may be an indication of the alternator failing but I would have the codes read ASAP to make sure there isnt any other problems to deal with.

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Unread 08-22-2013, 03:29 PM   #3
Dickpalmer
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Posts: 103
I'm going to change the alternator when it comes in, resetting the computer while doing so. Hopefully it won't come back on afterwards. It definately sounded like bearings going out on the alt. Could that cause the brushes to not get good contact and throw the light from low voltage?
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Unread 08-23-2013, 10:26 PM   #4
Dickpalmer
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Changed the alternator. No chirping, no check engine light. Took maybe an hour. Woo-Hoo, it's fixed.
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Unread 10-16-2013, 03:24 PM   #5
Freemaniz
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2014 JK Wrangler 
 
Join Date: Oct 2013
Location: Chicago, IL
Posts: 21
thats cool I have about 1,400 hundred miles on my 2014 JKU heard the same noise and the dealer told me my water pump is chirping
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