alternator replace or not to replace??? - Jeep Cherokee Forum
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alternator replace or not to replace???

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Old 09-28-2011, 10:28 PM   #1
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Default alternator replace or not to replace???

Stock alternator on a 01 cherokee. No pulley squeek or anything. All. Belts tightened perfectly.
Lately its been "whining" or making a whistle noise upon acceleration. Is this a beginning sign to its demise or am i just overthinking it.
Voltage sometimes drops well below the middle when idling at a redlight or even on park.
Running 2 hella black magic 500s and 2 hella amber rectangle fogs on lower part of Bumper. And lower watt sound system.
Made the noise before lights were on. So....?
Any feedback would be great.
Thnx
Terry
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Old 09-28-2011, 10:30 PM   #2
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Addition: Also seems to be worse in wet weather but does it in dry weather also.
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Old 09-28-2011, 10:34 PM   #3
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i got the exact same thing right now, ur alt. is going bad and its time to replace or upgrade. i killed mine when weldin my front bumper together, took a week to rebuild, and it does all those symptom after going mudding for a month or longer
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Old 09-28-2011, 10:37 PM   #4
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D***it thats what i was afraid of. :angry:

So how much time do I have? Its been doin it for 6+ months?
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Old 09-28-2011, 10:41 PM   #5
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I'd loosen the belt and feel the bearing. If there is any problem, change it. Odd though, maybe the belt should be tightened more perfectly. A slipping belt is the only thing I can see that would make it worse wet. Also a bad bearing will normally get hot. That's all I got, God luck...D.

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Old 09-28-2011, 10:45 PM   #6
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Its not the typical squeel though. I got rid of that noise a while Ago lol

Its just a whine. A bearing would Cause that? Hmm.
Well if i have to replace... Is it better to replace with oem? Or do the mean green high output? Or the wj mod?

I was so hoping that someone would say its a normal xj noise too lol darn..
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Old 09-28-2011, 10:57 PM   #7
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Definitely a bad bearing in the alternator if the noise is from it. At least you have some warning before it goes.
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Old 09-28-2011, 10:59 PM   #8
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So i should just replace the whole thing then...?
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Old 09-28-2011, 11:34 PM   #9
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If you have more time than $ you can change the bearing and brushes, test it with a meter. Use to be common. I just swapped mine wen it went bad, wasn't the bearing though. For the time and trouble its usually better to go new. I look for US made for parts.
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Old 09-28-2011, 11:41 PM   #10
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Ok. If i were to upgrade, is mean green the way to go? Or the grand Cherokee mod?
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Old 09-29-2011, 07:23 AM   #11
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Anyone?
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Old 09-29-2011, 08:25 AM   #12
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depends on ur money, mean green is $400 but its a bolt in 200 amp alternator. a grand cherokee alt. is cheap, but its only 136 amps and u got to do some grinding to make it fit
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