Help Diagnosing Noise
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HT4100 4.1, 4.5, 4.9 Discussion, Help Diagnosing Noise in Cadillac Engine Technical Discussion; I have a new noise brewing from the alternator. Or at least right under or by it. It wavers and ...
  1. #1
    MrDobin is offline Cadillac Owners Fanatic
    Automobile(s): 1985 Cadillac Seville Elegante
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    Help Diagnosing Noise

    I have a new noise brewing from the alternator. Or at least right under or by it. It wavers and is gone however after running a short while then returns when I restart later in the day. Its been -20F lately and only about 10 above today here in Minnesota, so its possible its a temperature issue. It doesnt appear to be a bearing or anything immediate for failure as the sound is not rough nor do any of my electronics fail or waver anywhere. Looking for some insight or ideas to the whine, it could just be a belt but it didnt feel lose... Link below shows the issue and sound is clear luckily. thanks to all in advance.

    [ame="http://www.youtube.com/watch?v=twuCtZAg3a0"]YouTube- Alternator whine... dying or just minnesota winter taking affect?[/ame]

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  3. #2
    carnut is offline Cadillac Owners Master
    Automobile(s): 1988 Allante' (sold), 1984 Eldorado, 84 Sedan DeVille
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    Re: Help Diagnosing Noise

    I dont have the benefit of speakers but a whine noise from the alternator can be it putting out more than normal amps to recharge a marginal battery. It will whine when first started to replenish the battery then quiet down once the battery is fully charged. I would have the battery load tested and if its ok, then I would have the alternator load tested next. In that extreme cold, I would expect some whine from the alternator when first started. Load testing will tell you the amp output from the alternator so you can compare what it should do vs what its actually doing. Load testing the battery will tell you how quickly it recovers from a max amperage load.

  4. #3
    MrDobin is offline Cadillac Owners Fanatic
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    Re: Help Diagnosing Noise

    Ya thanks. It tapered off today when we made it to 14 degrees haha woo. I had guessed the recharge exertion but wanted second opinion. Glad I found one

  5. #4
    carnut is offline Cadillac Owners Master
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    Re: Help Diagnosing Noise

    Boy, its sure been cold here in California as well, 40 degree nights and 55 degree days, with no rain nor wind!!!

  6. #5
    MrDobin is offline Cadillac Owners Fanatic
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    Re: Help Diagnosing Noise

    The state of Minnesota would scowl at that statement lol.

  7. #6
    steelybill is offline Cadillac Owners Enthusiast
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    Re: Help Diagnosing Noise

    You might remove the belt long enough to spin the alternator by hand to check the bearings for noise etc. Might save you from a cold night on the road if it's starting to make bearing noise.

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