94 Chevy K 1500 - Headlights kill Rear/Brake lights

Discussion in 'Chevy Truck Forum' started by smokeater1980, Nov 28, 2010.

  1. smokeater1980

    smokeater1980 Full Member

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    #1 smokeater1980, Nov 28, 2010
    Last edited by a moderator: Mar 27, 2011
    Hi I have a 94 Chevy K 1500, and I am having some problems with my tail lights. When I turn on my head lights my running lights do not work and brake lights don not work. My back up light do not work either. But when I have my head lights off my brake light and blinkers work, if I press on the brake pedal my blinkers stop working. I have check all the ground and blubs are good. Does anyone have any ideas? If so please help me out thanks.
     
  2. smokeater1980

    smokeater1980 Full Member

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    #2 smokeater1980, Nov 28, 2010
    Last edited by a moderator: Nov 29, 2010
    Tail Lights not working

    Just worndering if anyone knows whats going on? When I turn on my headlights my tail lights do not work. my head lights and front blinkers work but no tail lights and my brake lights don't work either when head lights are on. But when I turn them off my head lights my brake lights work and blinkers work, but when I stop on my brakes blinkers quit working. Anyone have any input please thanks
     
  3. chevychase

    chevychase Semi-Admin
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    If iam reading this right. Don,t know if i,am first thing to check blow bulbs , bad corroded sockets . also a bad ground wire.
    When you say blinkers , are you saying turn signals. When you put emergency lights on they will stop blinking when you apply brake.
    Maybe you can clarify a little. Thanks.
     
  4. smokeater1980

    smokeater1980 Full Member

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    Yes sir, I a talking bout my turn signals. My emergency flashers work, and my brakes lights work, but as soon as I turn my head lights on, I have no tail lights and my brake lights don't work. My turn signals flash fast, I have no tail lights when my lights are on. All blubs have been replaced and fuses are all good. I took out my light switch and took that apart and cleaned that contacts and put it back in. You think i could have something to do with my brake switch?
     
  5. chevychase

    chevychase Semi-Admin
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    I ran upon this problem once let me think about get back.
     
  6. 87c10slammer

    87c10slammer Senior Member

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    more then likely its your headlight switch.. even though you took it apart and cleaned it doesnt mean something wasnt burnt out on it. its one of the most common problems on older chevies..
     
  7. chevychase

    chevychase Semi-Admin
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    You need to make sure your ground at rear is good. When you turn on head lights if your ground is not good the head lights will take what there is away.
    See if i can exsplain a little better. If the only ground your getting is maybe from the screws in the tail light assembly , It is not enough, if you have too run you a new ground to the frame.
    Only other thing can be if switch is good. Have you had anything done to truck like change bumper ect.
     
  8. smokeater1980

    smokeater1980 Full Member

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    No sir I haven't changed anything like that
     
  9. smokeater1980

    smokeater1980 Full Member

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    So you might think its still my switch, ok thanks for the help, I need as much as i can get lol
     
  10. crabtruck

    crabtruck Senior Member

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    Until the factories wise up and start making just one wiring harness,
    the detail skipped in this thread helps a bunch. :)

    chevychase is right that clarifying would help.
    Big difference in whether turning on HEADLIGHTS gives problems,
    or turning on PARK LIGHTS gives problems, headlights don't change that.
    Guessing parks, not heads, are the deal.
    Switch makes them mechanically related, but not electrically.

    It's important to be aware that in the front the parks share the blinking,
    on the sides the parks blink OFF when parks are on, but ON when park are off,
    and in the rear, the brakes do the blinking. and the parks don't change.
    That truck has a 3rd brake light, knowing what it's doing helps too.

    Given the common wiring to the several combos, I would start with
    a check of the ground at rear at all connections including frame,
    followed by a inspection of any trailer wiring in that area.
    Best guess before any further details.
    I'm betting nothing to do with headlight switch.

    Hope that helps. There is a wiring diagram available,
    in several of the threads, for that exact truck.
     

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