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post #1 of (permalink) Old 09-11-2002, 06:59 AM Thread Starter
 
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Alternator Squeal under load?

Running a new 100amp alt with new rebuild and the alt will squeal but only under an electrical load.
Runs fine as long as I am running the headlights.
Runs fine as long as I am running the dual cooling fans.
If both are running the belt squeals only as I am accelerating or decel. It does not at idle or cruising speed.
I've checked the pulleys, tightened the belt, checked alignment. No help
I have a shut off switch to stop the fans and when the belt starts sqealing I can turn off the fans and the squealing stops. I can also turn the fans back on and there is no sqealing.
I'm thinking that it's the possibility of the draw of the fans/lights but cant make sense of it.
Any ideas?
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post #2 of (permalink) Old 09-11-2002, 07:39 AM
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Re: Alternator Squeal under load?

Get a spray can of belt dressing. Put a load on your alternator so it squeals. Spray the belt with the belt dressing. If the squeal goes away, your belt is slipping. If it doesn't, it's probably bearings.
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post #3 of (permalink) Old 09-12-2002, 03:25 AM
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Re: Alternator Squeal under load?

[img]images/icons/tongue.gif[/img] Don't forget here, Piggy, that when you increase RPM, the alternator can then do more work.....that is it can AT LONG LAST get the battery(s) charged up and replace the stored current that you stole by running the lights, fans, stereo, 12V juice blender, and your Jeepchick's 12V hair dryer all while the Jeep was at VERY LOW RPM [img]images/icons/frown.gif[/img]. What is happening is that the alternator is doing what it is supposed to, and that is crank out gobs of electrical current. It just so happens that when you have batteries which are calling for replacement current to rebuild the storage that you so recklessly pilfered, and the accessory loads are also sucking current like crazy, something has to give and it is the belt. There is simply not enough pulley area in contact to do the job AT THAT POINT. How about a nice dual belt setup?[img]images/icons/crazy.gif[/img] My crack moonguy alternator team is ready to parachute in and start stripping your Jeep in preparation for the big changeover to dual belt alternator drive.[img]images/icons/smile.gif[/img] You can also opt for a larger diameter pulley from Summit.[img]images/icons/tongue.gif[/img]
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post #4 of (permalink) Old 09-12-2002, 04:57 AM
 
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Re: Alternator Squeal under load?

You can save on the belt dressing by using a few *READ: two or three* drops of brake fluid on the contact area of the belt. Brake fluid eats rubber, and a couple drops will be enough to chew through the glaze on the belt without doing any further damage.
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post #5 of (permalink) Old 09-12-2002, 07:55 AM
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Re: Alternator Squeal under load?

While not being a fan of the brake fluid method, I do endorse the soap method. A bar of soap touched on the belt surfaces for a second will stop squealing cold. Plus, it's good to have on hand for leaks in gas tanks, etc.
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post #6 of (permalink) Old 09-12-2002, 03:41 PM
 
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Re: Alternator Squeal under load?

Never heard that one before - I'll have to try it. Thanks Dave!
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post #7 of (permalink) Old 09-12-2002, 04:03 PM
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Re: Alternator Squeal under load?

He posted on another thread that it was a pinched pulley grabbing the belt.
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