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Alternator Going Bad?

Discussion in 'General Discussion' started by MrSony, Jan 9, 2017.

  1. MrSony

    MrSony Royal Smart Person

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    About two hours ago as of writing this I've heard a loud audible squeal that rises with engine rpm. I'm used to belt squeal, going through three before I realized my pulleys were misaligned. I went out and checked. After driving around for 30 minutes. Both belts were cool to the touch, smelled like normal rubber (smelled when vehicle was off), and no visible signs of slippage. Couldn't spin the alternator pulley thing by hand, so there was no slippage. PS belt checked out fine too. The kicker is, until about two hours ago, my volts gauge read a constant 14-16 volts when running. Now it stays at 12 regardless of what I do and seemed to be going down. Also the gauge lights and headlights were visibly dimmer. I think my 89,710 mile alternator has bit the dust. What say you guys? I'm gonna take it to the parts store to have it tested either way. It's the 70 Amp V6 Alternator the car came with in 1985.
     
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  2. pontiacgp

    pontiacgp Rocket Powered Basset Hound

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    do you have a serpentine belt on the alternator?. If you do I would get a pry bar and tighten the belt on the alternator
     
  3. MrSony

    MrSony Royal Smart Person

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    Nah man. V Belts.
     
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  4. pontiacgp

    pontiacgp Rocket Powered Basset Hound

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    Then is sounds like you need a new alternator. I would find a local shop who rebuilds them, you'll get a better deal and a better alternator plus you can upgrade to higher output alternator. Or if you are tight for cash it is most likely the brushes that are done. You can change the brushes pretty easy
     
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  5. ed1948

    ed1948 Master Mechanic

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    Brushes or the triodes
     
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  6. mobileaudio25

    mobileaudio25 Greasemonkey

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    Mine does the same thing. Alt still works fine just whistles with the rpm as it goes up
     
  7. L67ss

    L67ss G-Body Guru

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    Regulator hooked up still?
     
  8. Longroof79

    Longroof79 Geezer

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    I agree with Steve...sounds like it's time for a new alternator. My old alt did the same thing when under a load. Get yourself a higher output unit. 105 amp.at least. You won;t regret it.
     
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  9. MrSony

    MrSony Royal Smart Person

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    Nothing's changed from before. Just started squeaking out of the blue. I think it's toast.
     
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  10. L67ss

    L67ss G-Body Guru

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    Ah yeah brain fart. A regulator unhooked wouldn't cause a squeak
     
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