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Alternator Whistles. New And Old One

Discussion in 'Early CJ5 and CJ6 Tech' started by juffer, Oct 29, 2020.

  1. Oct 29, 2020
    juffer

    juffer Juffer

    Netherlands
    Joined:
    Jun 16, 2007
    Messages:
    215
    hi,

    I have a whistle in my alternator and had it also in my old one. It is definitely the alternator. Because when I pull the connector ( ofcourse it does not load then) it is silent. I thought it was my bearing. but with a stethoscope on the rear bearing I hear nothing strange. Due to the fan and the pulley I can not doe this on the front bearing. Buyt the sound seems to come from the side and not inner.

    I thought it would be solved by a new alternator. But no. My question is ; is it possible that the diode makes this noice or something else?

    please hope for an answer from someone with the same problem or the solution.

    It also has a new battery and charges normal

    thank you in advance

    Ewoud
     
    Last edited: Oct 29, 2020
    juffer, Oct 29, 2020
    #1
  2. Oct 29, 2020
    Glenn

    Glenn Kinda grumpy old man Staff Member

    Apopka, Fl
    Joined:
    Sep 21, 2002
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    12,376
    Mine do that also. I have wondered if it's the type of alternator that causes it.
     
    Glenn, Oct 29, 2020
    #2
  3. Oct 29, 2020
    ITLKSEZ

    ITLKSEZ Hope for the best, prepare for the worst

    Spokane Valley, WA
    Joined:
    Aug 13, 2015
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    6,683
    That’s how I tell it’s working. :)
     
    ITLKSEZ, Oct 29, 2020
    #3
    dozerjim and Glenn like this.
  4. Oct 30, 2020
    Rick Whitson

    Rick Whitson Detroit Area 2024 Sponsor 2022 Sponsor

    I live South of...
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    Dec 2, 2014
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    I have heard that from alternators under full load, but neither of my GM one wires do it now ?
     
    Rick Whitson, Oct 30, 2020
    #4
  5. Oct 30, 2020
    PeteL

    PeteL If it wasn't for physics, and law enforcement... 2024 Sponsor 2023 Sponsor 2022 Sponsor

    Hills of NH
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    Aug 3, 2003
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    PeteL, Oct 30, 2020
    #5
  6. Oct 30, 2020
    Glenn

    Glenn Kinda grumpy old man Staff Member

    Apopka, Fl
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    Mine aren't GM but came from an automotive electrical shop, they do whistle more under a load. These are the ones that don't need revved up to start charging. Maybe it's the brand, manufacturer?
     
    Glenn, Oct 30, 2020
    #6
  7. Oct 30, 2020
    SoCalNickG

    SoCalNickG Member 2023 Sponsor 2022 Sponsor

    Whittier, CA.
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    It's one thing for the alternator to whistle but can it carry a tune?
     
    SoCalNickG, Oct 30, 2020
    #7
    Glenn likes this.
  8. Oct 30, 2020
    PeteL

    PeteL If it wasn't for physics, and law enforcement... 2024 Sponsor 2023 Sponsor 2022 Sponsor

    Hills of NH
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    "Do you know Your Alternator Whistles?"

    "No, but if you hum the first three bars, I'll pick it up from there..."
     
    Last edited: Oct 30, 2020
    PeteL, Oct 30, 2020
    #8
    Glenn likes this.
  9. Oct 30, 2020
    Glenn

    Glenn Kinda grumpy old man Staff Member

    Apopka, Fl
    Joined:
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    No, but it can hold the same note for quite a while. It's quite amazing, actually. :)
     
    Glenn, Oct 30, 2020
    #9
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