Cat c12 starting issue

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Cat27, Dec 29, 2021.

  1. Cat27

    Cat27 Bobtail Member

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    Dec 29, 2021
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    2004 Freightliner Columbia. Truck runs great but it cranks really hard when it’s cold. Starts a little better after it’s warmed up. No check engine light. Only has a abs light on. Any ideas?
     
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  3. bjytech

    bjytech Light Load Member

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    Nov 9, 2013
    Ohio
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    The cold will show the weakness in batteries and starters, as well as cable connections, starter has to work harder and pull more juice from the batteries the colder it gets.
    I would load check batteries and verify all connections are clean and tight first, then look into the starter.
     
  4. Cat27

    Cat27 Bobtail Member

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    Dec 29, 2021
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    I’ve took the cables off and cleaned them up. It’s been doing it for a while. Even in the summer. Acts like an engine that is vapor locked. After you run it and warm it up, it will start back easier, but still isn’t right.
     
  5. AModelCat

    AModelCat Road Train Member

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    Jul 7, 2015
    Canuckistan
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    Cranks slow or it takes an excessive amount of cranking before it fires off?
     
  6. Cat27

    Cat27 Bobtail Member

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    Dec 29, 2021
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    Cranks slow and longer than it should. Starter really drags like batteries are dead. It always starts though.
     
  7. A5¢

    A5¢ Medium Load Member

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    Oct 30, 2017
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    Has the starter ever been replaced? The brushes and commutator may be worn enough that it is no longer making a good complete circuit.
     
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