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

 

Addition: Also seems to be worse in wet weather but does it in dry weather also.

 

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

 

D***it thats what i was afraid of. :angry:

So how much time do I have? Its been doin it for 6+ months?

 

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.

 

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..

 

Definitely a bad bearing in the alternator if the noise is from it. At least you have some warning before it goes.

 

So i should just replace the whole thing then...?

 

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.

 

Ok. If i were to upgrade, is mean green the way to go? Or the grand Cherokee mod?

 

Anyone?

 

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