alternator whine

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10-04-2006, 11:48 PM

house302

2nd Gear Member

Thread Starter

Join Date: May 2005

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Posts: 372

alternator whine

my alternator tends to whine after i have been beating on my car and the temp gets up to 180-190 degrees. anybody know what could cause such a thing.

10-05-2006, 12:06 AM

PRO50SC

The Rogue Mod

Join Date: Feb 2006

Location: Maryland Sucka's!!

Posts: 21,918

RE: alternator whine

What type of electrical accessories do you have? If you are using alotta juice, it's normal cuz the reg is doin' it's job by letting the extra current flow to charge the bat back up.

10-05-2006, 12:09 AM

93 LX FiveO

5th Gear Member

Join Date: Aug 2006

Location: Haverhill, MA

Posts: 3,664

RE: alternator whine

190 is by no means "hot"

possibly over-working the alt. ive never seen one make noise but ive seen them smoke!

10-05-2006, 12:14 AM

house302

2nd Gear Member

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Join Date: May 2005

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Posts: 372

RE: alternator whine

i have one amp running my mids and highs, aftermarket gauges, cd player, optima battery. i double grounded my alternator and started it back up and didnt hear the noise. i was wondering how much play there is on the belt tensioner.

10-05-2006, 12:21 AM

90GTRagtop

2nd Gear Member

Join Date: Sep 2004

Posts: 394

RE: alternator whine

Could be something breaking down and creating an internal load like a short inside the alternator after it gets up to temperature. Could be a bearing breaking down underload. Or it could be that your alternator is getting ready to give up. This is all assuming it's an internal whine in the alternator as opposed to belt noise at the pulley.