Jeep Wrangler Forum

Jeep Wrangler Forum (
-   TJ Tech Forum (
-   -   Whistling alternator? (

baker3 12-10-2012 10:16 AM

Whistling alternator?
So i started the jeep this morning and it sounds like the alternator is whining. Is it common?

4x4jeeptj 12-10-2012 10:36 AM

I know a lot of Cherokees "whistling". My buddies does it every time he starts it. And to me it sounds more like the starter. Kinda like its not disengaging like it should and when the motor cranks it spins the starter while engaged and causes the "whistle"

jasonduke5 12-10-2012 10:44 AM

mine does this when it is cold out. Mine sounds like it comes thru the speackers. even with the radio off it still does it but after running a few minutes it stops.

baker3 12-10-2012 10:47 AM

Ya it stopped after about 15 mins. I did pop the hood and it definetly sounds like the alternator. It sounded supercharged!!

Rick-2011 12-10-2012 06:06 PM

You better check your OPDA. If the noise sounds like the "screaming monkey" it's probably that. Theres tons of stuff online regarding the OPDA failures, especially on 05 and 06 Wranglers

Jerry Bransford 12-10-2012 06:22 PM

My guess is a bad bearing in either the alternator or idler pulley which is right next to the alternator.

baker3 12-10-2012 07:08 PM

I thought the 2002 didn't have the OPDA problem? Thanks Jerry, i'll probably replace the alternator and see if that fixes it. It didn't do it after it warmed up.

Jerry Bransford 12-10-2012 07:13 PM


Originally Posted by baker3 (Post 3088651)
I thought the 2002 didn't have the OPDA problem?

It doesn't, that's an 05/06 issue. :)

baker3 12-10-2012 07:17 PM

Sweet! Glad that I don't have that issue, I have heard it is a nightmare.

SurfKaster 12-10-2012 09:42 PM

My old 4runner's alternator did the same thing when it dropped below 60 degrees. Always went away after it warmed up. It did that the last 7 of the 9 years I owned it.

baker3 12-10-2012 09:51 PM

Now that I remember, my 04 F-150 did it too, hopefully it is just cause its cold out.

Markrak 01-07-2014 01:03 PM

Did you ever come up with the solution to the whistle? Mine does it but only when it's cold outside, it stops when I have my foot on the gas and comes back when I'm off the gas, and usually stops completely after the engine is warm. Any help would be appreciated!

All times are GMT -5. The time now is 01:48 AM.

User Alert System provided by Advanced User Tagging v3.1.0 (Pro) - vBulletin Mods & Addons Copyright © 2016 DragonByte Technologies Ltd.
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2016 DragonByte Technologies Ltd.