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Alternator Whistles. New And Old One

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

  1. juffer

    juffer Juffer

    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. Glenn

    Glenn Kinda grumpy old man Staff Member

    Mine do that also. I have wondered if it's the type of alternator that causes it.
     
    Glenn, Oct 29, 2020
    #2
  3. ITLKSEZ

    ITLKSEZ Hope for the best, prepare for the worst

    That’s how I tell it’s working. :)
     
    ITLKSEZ, Oct 29, 2020
    #3
    dozerjim and Glenn like this.
  4. Rick Whitson

    Rick Whitson Detroit Area 2024 Sponsor 2022 Sponsor

    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. PeteL

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

     
    PeteL, Oct 30, 2020
    #5
  6. Glenn

    Glenn Kinda grumpy old man Staff Member

    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. SoCalNickG

    SoCalNickG Member 2023 Sponsor 2022 Sponsor

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

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

    "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. Glenn

    Glenn Kinda grumpy old man Staff Member

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