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05-10-2017, 05:45 PM
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#1 |
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Registered User
Join Date: Dec 2016
Location: Strongstown
Posts: 57
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Alternator noise
I have a whinning noise coming from my alterntor,if I take the power off of it the noise stops.The real issue is this is a new unit and I've tried two others. New belt and no sign of water pump problem. At idle its low, but ay higher RPM's you can hear it in the cab Any thought would be appreciated.
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05-11-2017, 08:28 AM
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#2 |
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Senior Member
 Join Date: Jul 2015
Location: Warrenton VA
Posts: 1,107
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Re: Alternator noise
You picking up feedback through your speakers?
__________________
71 c-10 Long Bed, under the knife for a No Limit Engineering Wide Ride Chassis Pack and coil over static drop. 07 Silverado Classic 2wd 95 Camaro 427SBC/TH350 |
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05-11-2017, 09:30 AM
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#3 |
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Registered User
Join Date: Dec 2016
Location: Strongstown
Posts: 57
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Re: Alternator noise
The truck is bare bones at this time,no speakers.Thanks for the reply
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05-11-2017, 10:08 AM
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#4 |
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Registered User
Join Date: Feb 2012
Location: Ruskin Florida
Posts: 4,567
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Re: Alternator noise
How is the voltage output?
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70 swb 4x4 406sbc 700r4 203/205 d60/14blt locker yadda yadda http://67-72chevytrucks.com/vboard/s...88#post6935688 Yeller 72 Blazer 2wd conversion project "No Daggum Money" http://67-72chevytrucks.com/vboard/s...d.php?t=550804 LS1-T56 3.73 LSD super budget build Blanco-2014 Sierra SWB https://67-72chevytrucks.com/vboard/...d.php?t=810350 |
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05-11-2017, 01:58 PM
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#5 | ||||
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"I ain't nobody, dork."
Join Date: Sep 2007
Location: Whidbey Island, Washington
Posts: 8,971
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Re: Alternator noise
Just pretend it is blower whine...
  Gary
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'cuz chicks dig scars... My 1972 GMC 1500 Super Custom (Creeping Death) "long term" build thread. The Rebuild of Creeping Death after the wreck Quote:
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05-11-2017, 09:29 PM
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#6 |
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Registered User
Join Date: Dec 2016
Location: Strongstown
Posts: 57
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Re: Alternator noise
14 volts across the terminals. I thought it was more like a gear drive.
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05-11-2017, 10:30 PM
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#7 |
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Registered User
Join Date: Oct 2005
Location: Overland Park, Ks.
Posts: 5,229
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Re: Alternator noise
A shorted diode will make it whine like a bad bearing, but you say you have tried other alts. This is a tough one.
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05-12-2017, 01:01 AM
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#8 |
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Senior Member
Join Date: Feb 2002
Location: Tucson, AZ USA
Posts: 7,512
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Re: Alternator noise
I've got the same gripe on the last 2 alternators on the L6 292 in my '68 C/10. I replaced it with one ''lifetime guarantee'' alternator [external regulator type] from O'Reilly's.
New one on and same whine, same red GENERATOR light in the dash. If I rev up the RPMs, and let it settle down, the whine and red light go out, until the next light. I may have to shim one of the pulleys in the front. It's possible the belt's misaligned. I'm thinking of getting a 12SI alternator. Getting a good vintage alternator out of O'Reilly's was like pulling teeth. Never had that problem when they were Checker Auto.
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Every 25 years I like to rebuild that 292, whether it needs it or not. |
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05-12-2017, 09:19 AM
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#9 |
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Registered User
Join Date: Dec 2016
Location: Strongstown
Posts: 57
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Re: Alternator noise
The fellow who rebuilt this alternator is a personel freind and has been in the business for 20 yrs. He's scratching his head. He's making a house call to my place today. Has to be something in the truck,it started after I bought it with the old unit.THANKs for all the replies.
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