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Courtesy Light wiring question

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by 1Blazin71, Sep 17, 2000.

  1. 1Blazin71

    1Blazin71 1/2 ton status

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    In our 71 CST, I find the door piller switch circuit which provides a ground when the door is open, so a dome lamp or underdash lamp comes on.

    What I now want to find is the circuit that should be controlled from the headlamp switch. Rotating this switch controlls the dimmer on the gauge lamps. Rotating it all the way counter-clockwise, past a slight detent, should be what would have caused the dome/courtesy lamp to come on.

    I've probed every wire on the back of the switch and find the following:

    Red: Hot always
    White: always ground
    Lt Blu: Hot when parking lamps on
    Orange: Hot when parking lamps on
    Brown: Hot when parking lamps on
    Lt Green: Hot when parking lamps on

    I would have thought I'd find a ground wire which was only grouned when the switch was rotated all the way left, dome light on, so it could control the same lamp the door post switches would?

    Any one have any ideas?

    Matthew Meyer
    matthewm@inhollywood.com
    71 K5
    4" Lift/ 35"s
    ZZ4 350/ 700R
     
  2. DBLAZER

    DBLAZER 1/2 ton status

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    ARe you checking all this wiring with the door open???? If it is you will see ground on the white wire. Which is the one you need. Make sure the doors are closed and the dome light is off.

    [​IMG]
     
  3. 1Blazin71

    1Blazin71 1/2 ton status

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    That got me thinking. I knew I had to have the door switch open (same as door closed) but had to have the door open to fit my fat a$$ under the dash. I wedged a piece of wood in there but still got ground. Turns out the passenger side door switch wire was mangled and shorted to the kickpanel.

    Thanks for making me look for the obvious.



    Matthew Meyer
    matthewm@inhollywood.com
    '71 K5 - 4" Lift 35"s
    ZZ4 350 - 700R
     
  4. DBLAZER

    DBLAZER 1/2 ton status

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    Hey, in my line of work i have learned that is where you should always start. Not that I always do. [​IMG]

    [​IMG]
     
  5. Michael

    Michael 1/2 ton status

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    I did this exact same thing tonite....with the same results. White always ground......with the door open! Thanks dblazer for helpin' us out.

    Michael [​IMG] http://jmartin.net/parker/goose.htm
     
  6. DBLAZER

    DBLAZER 1/2 ton status

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    No problemo .

    [​IMG]
     

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