alternator noise - Team Camaro Tech
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post #1 of 7 (permalink) Old Dec 4th, 06, 07:02 PM Thread Starter
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alternator noise

Its been cold here and I notice that when I put a load on the electrical system by turning on the headlights I hear what sounds like a bearing noise--turn off the lights it goes away, back on it grinds. The car is fully warmed when this happens. The belt is not new but OK and tight. What do you guys make of it? Anything I should do?

Thanks!
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post #2 of 7 (permalink) Old Dec 4th, 06, 09:53 PM
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Re: alternator noise

Put a long screw driver where the bearings are and the handle against your ear...If u dont have a mechanics stethoscope.
Bearings will effect how it charged...
They are cheap
Diodes should be ok, they are very robust
New bushes are cheap
Pays to turn down the arniture contacts...If u dont have a lathe, get a long leather boot strap, a strip of wet and dry 800 and 1200 grit.
Rap the sand paper around then the boot stap around twice, lubricate with a bit of kero, pull back and forth on the ends of the boot strap...

AND while everything is out of the case, polish it....
Which reminds me, mark the cases so they go back together bolted up the same way....its a real bugga(Kiwi slang), to get it wrong ready to bolt into the car then have to dismantle again.

My Spelling is not incorrect...it is creative

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post #3 of 7 (permalink) Old Dec 5th, 06, 01:02 PM
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Re: alternator noise

And while you're at it, look in the phone book for your local alternator/dc motor repair shop. In your spare time, hang-out there and make friends.

One owner 69 Camaro,(yep, bought it new
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post #4 of 7 (permalink) Old Dec 5th, 06, 02:48 PM
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Re: alternator noise

Or do what I have done...after doing mine....get your daughter to marry a Auto sparky

My Spelling is not incorrect...it is creative

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post #5 of 7 (permalink) Old Dec 5th, 06, 04:35 PM
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Re: alternator noise

Sounds like the diodes are going.

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post #6 of 7 (permalink) Old Dec 5th, 06, 04:56 PM
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Re: alternator noise

Quote:
Originally Posted by sthoma10 View Post
The belt is not new but OK and tight. Thanks!
Belts with age and extensive use need replacing. Best troubleshooting is to spray belt with WD40, if it quiets down, replace belt.

Look at the sides of the V, if glazed/shiny, needs replacing. Install new belt, run car for a couple days, retighten belt.

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post #7 of 7 (permalink) Old Dec 10th, 06, 09:13 AM
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Re: alternator noise

I had intermittent bad alternator noise. Mine turned out to be alternator cooling fan hitting (just barely) mounting bracket. Drove me crazy. I replaced water pump initially before I discovered it.............


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Dave F. in Rhode Island
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