Weak alternator and making winding noise

Tiny
CAMP.
  • MEMBER
  • 2005 TOYOTA SEQUOIA
  • 4.7L
  • V8
  • 2WD
  • AUTOMATIC
  • 212,000 MILES
Okay, been hearing a winding noise coming from my vehicles alternator. Other then the crazy winding noise, the truck drives good. But lately I notice the battery gauge in my truck flickering from 13.49 volts to 12.10 volts while the truck is idling or coming to a stop. But as soon as I give it a little gas the battery gauge goes back up around 13.49 volts. Now, I took the alternator to local parts store to be tested it tested good. Okay, my multi meter tested 13.49 volts running in park. When I add the lights, air conditioning, and radio, the volts drop down around 12 volts. So I think it's time to replace the alternator, but I was wondering would changing the brushes would take care of my charging problems? Is there a way to check the brushes to see if the need replacing? Napa auto parts have a brush replacement for $26.00 or alternator replacement for $225.00 to $400.00. Can you please help me out? Thank you guys.
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Saturday, July 18th, 2020 AT 4:03 AM

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Tiny
ASEMASTER6371
  • EXPERT
Good morning,

I would definitely replace the alternator. There is a lot more than just the brushes for an alternator. There is a rectifier bradge and diode trio as well as bearings that are causing the noises.

https://www.2carpros.com/articles/how-to-replace-windshield-wiper-blades

https://www.2carpros.com/articles/how-to-replace-an-alternator

REMOVAL

1. REMOVE ENGINE UNDER COVER
2. REMOVE THROTTLE BODY COVER
3. DISCONNECT CABLE FROM NEGATIVE (-) BATTERY TERMINAL
4. DISCONNECT INTAKE AIR CONNECTOR FROM THROTTLE BODY

imageOpen In New TabZoom/Print

5. REMOVE DRIVE BELT
Loosen the belt tension by turning the belt tensioner counterclockwise, and remove the drive belt.

HINT: The pulley bolt for the belt tensioner has a left hand thread.

6. REMOVE PS VANE PUMP FROM ENGINE
7. REMOVE GENERATOR
a. Disconnect the generator connector.
b. Remove the terminal cap and nut, and disconnect the generator wire.
c. Disconnect the wire clamp from the cord clip on the generator.
d. Remove the bolt, the 2 nuts and the generato
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Saturday, July 18th, 2020 AT 4:37 AM

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