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Alternator acting strange....

Discussion in '2nd Gen Tundras (2007-2013)' started by gihuff, Jun 14, 2018.

  1. Jun 14, 2018 at 7:14 PM
    #1
    gihuff

    gihuff [OP] New Member

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    2008
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    At startup.....volt meter on dash reads below center
    Voltage at battery (running) 12.5V
    after 45 seconds (checked this several times and is consistent)
    It sounds like a clutch kicks in and volt meter on dash goes to center
    and voltage at battery now at 13.8
    Now I know there is no clutch on the alternator right?
    Sounds just like a AC compressor clutch kicking in
     
  2. Jun 14, 2018 at 7:54 PM
    #2
    rocky_mtn_trd

    rocky_mtn_trd Voided Warranty

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    Jeremy
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    What accessories do you have running while you are performing this test? Simple way to find out would be to just have the charging system load tested. Oh, and welcome from CO!
     
    Black Wolf likes this.
  3. Jun 14, 2018 at 7:58 PM
    #3
    gihuff

    gihuff [OP] New Member

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    Thanks for the welcome!
    Nothing on.....Just start and wait 45 seconds and you hear it kick in
     
  4. Jun 14, 2018 at 7:59 PM
    #4
    Black Wolf

    Black Wolf Where's my popcorn salt? Damnit

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    Zone UCA's, Fat Bob's Vated, Pro Form Fab shackles, Patagonia M/T's, Ranch Hand Grill Guard, RC steps, SDHQ AIP relocation kit, RetraxONE MX, Jomax ABS armor
    Exactly. Always test alternator under load conditions and monitor not the volts out but the current output.
    [​IMG]
     
    ColoradoTJ and rocky_mtn_trd like this.
  5. Jun 15, 2018 at 7:15 PM
    #5
    gihuff

    gihuff [OP] New Member

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    I'll just replace it
     
  6. Jun 15, 2018 at 7:42 PM
    #6
    Vizsla

    Vizsla New Member

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    The air injection pump runs on start up for a bit, and has a noticeable electrical draw. Might be worth checking, can usually hear it running.
     

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