579 wiring question.

Discussion in 'Peterbilt Forum' started by JadedGrace, Mar 4, 2016.

  1. JadedGrace

    JadedGrace Bobtail Member

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    2013 579. There is a switch on the instrument panel labled "spare". It has a wiring harness to it, it has power. I want to use this switch to wire up some chicken lights. My question is: where does this line manifest itself under the hood? It has to come out somewhere, bit I can't locate it... Anyone?
     
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  3. Riprap

    Riprap Light Load Member

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    On 389s there's a couple dead end harnesses under the hood that's rolled up under the fuse box that connect to the switches on the dash. Look for one labeled "option power" and another one is labeled "sleeper/cab lights"
    I'd assume the 579 is wired the same
    image.jpeg
     
    Oxbow Thanks this.
  4. JadedGrace

    JadedGrace Bobtail Member

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    Is this the fuse box that sits directly in front of the driver under the hood?
     
  5. Riprap

    Riprap Light Load Member

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    Yes look at the harnesses underneath that fuse box to see if there's any wires that arent connected to anything. There maybe a couple that are from the switch
     
  6. Riprap

    Riprap Light Load Member

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    image.jpeg If you have the aux switch, it powers a wire harness under the fuse box that has a sticker attached labeled cab/sleeper lights, this is what my chix lights are connected to.
    The switch with relay switch powers that wire I was holding in the first pic I sent, both harnesses are next to each other underneath the under hood fuse box on the drivers side.
    I haven't found where the rest of the spare switches lead to
     
  7. JadedGrace

    JadedGrace Bobtail Member

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    This is the fusebox right in front of the driver.
     

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  8. JadedGrace

    JadedGrace Bobtail Member

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    This mess of wires is about a foot below it, crammed under the steering column. Is his where I should be looking?
     

    Attached Files:

  9. Riprap

    Riprap Light Load Member

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    Yes, in that mess is where the switch wires were located on mine, they were coiled up and zip tied.
    Another option for you if nobody else has proper 579 info is- check under your bunk inside the sleeper door on the drivers side, you may have a large terminal/junction block inside that has wires running to it. Sometimes this box is located under the truck on the frame somewhere. It will have wires connected to studs labeled- turn signal, brake lights, marker/clearance lights etc. You can add your chicken lights power wire to the marker light terminal stud and they will work with your truck light switch instead of the "spare switch". The terminal block looks like this-
    image.jpeg
     
  10. Jasonb389

    Jasonb389 Bobtail Member

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    Mar 5, 2016
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    How do you get the power turned on to the spare switches? I have 5 spares but none of them light up when switched on
     
  11. Riprap

    Riprap Light Load Member

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    If they don't light up then you probably don't have harnesses connected to them. image.jpeg You could buy the harnesses or make your own, I don't know what each terminal does but they should be easy enough to figure out by testing the terminals continuity with a multimeter and moving the switch position
     
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