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Discussion Starter · #1 ·
Well, this has been going on for some time now but I'm starting to get sick of it; my alternator is making a whining/high frequency sound as I'm driving and even while I'm at idle. I replaced the alternator a little over a year ago and it's been doing it for a few months. I'm not having any electrical problems or any lights dimming or problems with electrical power. It's just annoying; if I open my left vent to allow air to circulate I can even here it more. It generally stays "on" and never goes away. Any thoughts or cures?
 

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i'm guessing you have either a bad belt that is whinning on the pulley V or you have a rebuilt alternator that didn't get a new bearing when it was rebuilt (you'd be surprised what little is repaired at some places)

so either replace the belt or at least take it off and inspect it, and turn the alternator by hand and feel for rough rotation or excessive play in the bearing. hope this helps.
 

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i had the same problem. belt was a little too loose. whenever i cut the stereo up or turned on the lights there was a godawful squeling sound you could hear 2 blocks away.

Tighten your belt up a little first and go from there. Dont be afraid to use a big screwdriver or somthing to hold the alternator back while you tighten it down.
 

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Discussion Starter · #5 ·
Thanks for the help guys, I appreciate it. I know for a fact that its not the belt. I will hang over the motor and put my ear up to the alternator and it's coming from inside it... It's not a squeeling sound or anything related to friction. Its more like a higher frequency electrical "humming" noise. It's hard to explain. I don't think there's anything I can do for it anyways. And it is a rebuilt alt. It intermittently makes this noise but it is consistantly doing it; if that makes any sense. It'll do it for a few seconds, take a break for a second, then do it then stop then do it lol. What a pain in the arse. =P
 

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Discussion Starter · #7 ·
Yeah you're right it can't hurt. When I get home from work today if it isn't raining I will take a closer look at it. Thanks again for you help.
 

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If it isn't the belt, it's the diode in the alternator. It's at the input-out area. The diode regulates the current (I think!). But I don't think it's practical to just replace only the diode. Specialisits, please concur... I think it's the fraxin' Diode.

Get a new (or different) alternator if it isn't the belt. It happened to me.

"What's with the squeeling? Sounds like an old TV!" haha.

Now, wait a minute - I just thought of something, is your squeeling constant? Or just on start-up?

One of my CRX had a belt tensioner seize-up on me, and the squeeling was the sound of the TIMING belt (not the alternator/AC belt) wasting itself on a non-moving idler-pulley. Finally it Fried and the engine (after the healing) still runs great.

It's the diode, diude.

Please check the clues, and get back.
 

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Discussion Starter · #9 ·
Thanks for the advice long, I appreciate it. Well, my inability to be accurately descriptive about my problem with the alternator hinders everyone elses ability to understand me precisely and offer a reasonable solution. So, I have narrowed the sound down to the inside of the alternator. The sound comes and goes at will and generally does not last long; maybe only seconds before it goes away. The good thing is I do not notice any electrical difficulties inside my car. Since the car doesn't seem to be effected by what is going on, I don't think an alternator replacement would be necessary; however, in the long run it may be. My biggest reason for posting is the darned noise is just getting on my nerves, lol. It's not that the noise is very loud; it is actually at a low volume, high pitch. I can barely hear it if my vent is closed but when it is open I can hear it a lil better. I have asked my girlfriend if she hears it while we are driving and she says no. So it's almost like I am 'trying' to hear it but I know it's there. I guess I've just been hearing it for so long that I know what to listen for.

Either way, I appreciate everyones' advice and taking their time with trying to help me determine what the problem is.
 

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Ignore it until it becomes OCD (obsessive compulsive disorder) Howard Hughes had it! It's going to eventually be your alt's diode. Doesn't really hurt anything, just annoying.
 
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