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Factory fog light switch with Hella 500s

Discussion in '2nd Gen. Tacomas (2005-2015)' started by sfcadams, Dec 30, 2011.

  1. Dec 30, 2011 at 4:47 PM
    #1
    sfcadams

    sfcadams [OP] Retired Senior NCO

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    Need some help guys. I have a 2011 Tacoma Prerunner. I have a set of Hella 500s that I am going to mount behind my grill. I have a factory fog light switch that I want to use and mount it in one of the blank spots on the dash. Can anyone tell me how this will need to be wired? According to the Hella instructions, there is only one wire going to their included switch, one wire to ground off of the switch, and one wire to positive off of the switch. The factory toyota plug I have has 4 wires coming off of it. Basically need to know how to wire these lights to the factory toyota switch. Can anyone help me out please?
     
  2. Dec 30, 2011 at 5:08 PM
    #2
    muisejt

    muisejt Well-Known Member

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    the top two pins are the one's you need, put the ground on one and the wire from the relay on the other. the bottom two are for the light in the switch
     
  3. Dec 30, 2011 at 5:25 PM
    #3
    sfcadams

    sfcadams [OP] Retired Senior NCO

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    Ok if I do that, how do I get the lights powered up? There has to be a positive wire coming off of the switch somewhere to get power going to the lights, right? Please take a look at my crude wiring and see if you understand what I am asking?[​IMG]
     
  4. Dec 30, 2011 at 5:30 PM
    #4
    Large

    Large Red

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    I'm not sure if you have a volt meter handy but push the switch in (close the ckt) and find 2 pins that have continuity. Put your hot from your battery to one prong and the hot to the lights on the other.
     
  5. Dec 30, 2011 at 5:33 PM
    #5
    Large

    Large Red

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    Also hook the ground and a short wire from the battery and find out which prong lights up the LED when the ckt is closed, make a jumper from the same prong on the OEM foG light switch as they are only small amperage
     
  6. Dec 30, 2011 at 5:37 PM
    #6
    muisejt

    muisejt Well-Known Member

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    you have four wires coming off the relay, power goes to two of them, one goes to the lights and the other to the switch. when the wire that goes to the switch is grounded it causes the solenoid in the relay to move and close the circuit going to the lights, i.e. there is now power going to the lights
     
  7. Dec 30, 2011 at 5:40 PM
    #7
    sfcadams

    sfcadams [OP] Retired Senior NCO

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    OK, so I would wire one of the wires to the battery and one to the yellow wire off of the relay, and what do I do with the other two? Sorry if these are stupid questions but I don't have a lot of knowledge on this kind of stuff.
     
  8. Dec 30, 2011 at 5:59 PM
    #8
    muisejt

    muisejt Well-Known Member

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    connect red and blue to +12v, black goes to lights and yellow goes to top pin (pin 4) on switch, next pin down (pin 3) goes to ground
     
  9. Dec 30, 2011 at 6:05 PM
    #9
    sfcadams

    sfcadams [OP] Retired Senior NCO

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    muisejt,

    You say to connect red and blue to +12v but the blue wire coming off of the relay is a negative according to the hella instructions?
     
  10. Dec 30, 2011 at 6:25 PM
    #10
    muisejt

    muisejt Well-Known Member

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    you could do it that way, you would just need to run +12v to the switch instead of a ground
     
  11. Dec 30, 2011 at 6:42 PM
    #11
    sfcadams

    sfcadams [OP] Retired Senior NCO

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    Ok, I am totally lost, lol.
     
  12. Dec 30, 2011 at 7:23 PM
    #12
    muisejt

    muisejt Well-Known Member

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    here's two diagrams that show each way you can hook it up, and don't forget a fuse between the battery and relay like I did in the diagrams

    [​IMG]

    [​IMG]
     
  13. Dec 30, 2011 at 7:32 PM
    #13
    Forster46

    Forster46 Very nice how much?

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    I'm doing the same thing. Good luck!
     
  14. Dec 30, 2011 at 7:36 PM
    #14
    rhion82

    rhion82 The One The Only

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    For the 12v I tapped into the power that powers the radio when the key is turned on. But for the factory switch I do not know. I will be ordering me one so I'll come back here to check for the answer lol.
     
  15. Dec 30, 2011 at 7:41 PM
    #15
    sfcadams

    sfcadams [OP] Retired Senior NCO

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    muisejt,

    I think the diagrams you made will help but it looks like there is only 2 wires being used from the factory switch on either diagram. Are the other two wires from the switch only used if you want the switch to illuminate?
     
  16. Dec 30, 2011 at 8:12 PM
    #16
    muisejt

    muisejt Well-Known Member

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    yes they are for the switch illumination. if you look at an existing switch you'll see a green wire and a green/white wire, those are for the illumination. if you have a plug connected to the back of the blank you pop out to put the switch in you just you those wires for the illumination
     
  17. Dec 30, 2011 at 8:31 PM
    #17
    sfcadams

    sfcadams [OP] Retired Senior NCO

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    Ok, here is what I just tried to test things out. I wired the red wire (+) from the relay to the + post on the battery and the blue wire (-) from the relay to the - side of the battery. I wired the yellow wire from the relay to one of the wires on the new factory switch and ground the other wire from the factory switch to a ground. The switch will not turn the lights on/off. They just stay constantly lit. What am I doing wrong now? Am I getting closer?

    Thanks for all of your help!
     
  18. Dec 31, 2011 at 6:50 AM
    #18
    sfcadams

    sfcadams [OP] Retired Senior NCO

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    morning bump
     
  19. Dec 31, 2011 at 6:54 AM
    #19
    MQQSE

    MQQSE Chief Pal Guy, GOB

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  20. Dec 31, 2011 at 6:58 AM
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    muisejt

    muisejt Well-Known Member

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    connect the blue wire to the positive side of the battery
     
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