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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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87-90 Renix jeep owners. This is a link to great info! http://www.cherokeeforum.com/f23/tes...itings-136452/
The book's wrong! #1 is at 5:00, viewed from the side. 153624 clockwise.
I RECOMMEND 280 155 746 INJECTORS, FOR YOUR 87-90 JEEP. 4 holes are better than one, and they won't leak out the middle,(like stock injectors can)
"The problem is not that we have too many fools, it's that the lightning isn't distributed right." Mark Twain




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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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87-90 Renix jeep owners. This is a link to great info! http://www.cherokeeforum.com/f23/tes...itings-136452/
The book's wrong! #1 is at 5:00, viewed from the side. 153624 clockwise.
I RECOMMEND 280 155 746 INJECTORS, FOR YOUR 87-90 JEEP. 4 holes are better than one, and they won't leak out the middle,(like stock injectors can)
"The problem is not that we have too many fools, it's that the lightning isn't distributed right." Mark Twain



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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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1988 MJ-- Project--jack stands, no axles
1995 XJ-- Daily driver--5" RC lift, 33x12.5 BFG KM2s
1993 ZJ-- rottin away in the backyard
1993 XJ-- SCRAPPED!!!
1995 S10-SOLD!!!!!!
Quote:
Originally Posted by odgreen89on35s View Post
Your lucky that 100 shot of caps lock didn't blow the welds off the Internet.
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