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Truck on runs when key is turned to on/start position

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by SeawrightFreight, Apr 24, 2018.

  1. Apr 24, 2018 #1
    SeawrightFreight

    SeawrightFreight Bobtail Member

    4
    3
    Dec 14, 2017
    Atlanta, GA
    0
    I have a 2006 Freightliner Columbia Detroit 60. This truck will not stay running unless the key is held in the on position. Once i let the key go the truck shuts off. Fires up no problem. Could it be a fuse? Ignition? Starter? Fuel pump? I have no idea. Any advice?
     
    SeawrightFreight, Apr 24, 2018
    SeawrightFreight, Apr 24, 2018
    #1
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  3. Apr 24, 2018 #2
    Heavyd

    Heavyd Road Train Member

    7,626
    6,027
    Feb 4, 2009
    0
    Ok, need to understand this better. Are you holding the key in the "start" position and then when you release it to the "run" position it stops? If so you are forcing the starter to stay engaged and this is what is turning the engine. You will burn your starter out in no time. If the engine is properly firing and dies when you release the key switch, it might be just a bad ignition switch.
     
    Heavyd, Apr 24, 2018
    Heavyd, Apr 24, 2018
    #2
    little cat 500 Thanks this.
  4. Aug 20, 2021 #3
    sergk1989

    sergk1989 Bobtail Member

    39
    10
    Jan 23, 2013
    0
    What was the problem, my truck is doing the same. Already put new ignition switch
     
    sergk1989, Aug 20, 2021
    sergk1989, Aug 20, 2021
    #3
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