KW headlights not switching on

Discussion in 'Trucks [ Eighteen Wheelers ]' started by Steve2804, Sep 21, 2017.

  1. Steve2804

    Steve2804 Bobtail Member

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    11
    Jun 26, 2016
    0
    2011 t-660. Headlights will sometimes not turn on. If I turn the switch off and on a few times, they will eventually turn on. Anyone experienced this issue before? Fuse? Switch?
     
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  3. Lyle H

    Lyle H Road Train Member

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    Apr 16, 2014
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    Are you waiting for the ecm to do its pre-check before you start the truck?
    Trying to start the truck too fast can screw up the communication between the different computers.
     
  4. Steve2804

    Steve2804 Bobtail Member

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    11
    Jun 26, 2016
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    Yep. I always wait for the clicking to stop!!
     
  5. 86mechanic

    86mechanic Medium Load Member

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    Sep 6, 2016
    Northridge, CA
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    Could be the switch, if the fuse was bad it wouldn't work at all
     
  6. snowman_w900

    snowman_w900 Road Train Member

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    Nov 25, 2010
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    Check one of the black relays in the fuse panel. I had similar issues on my t600.
     
    SAR Thanks this.
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