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(NEED HELP!!) Courtesy underglows for running boards attached to Dome Light

Discussion in '3rd Gen. Tacomas (2016-2023)' started by Jrobtheginger, Jan 20, 2019.

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  1. Jan 20, 2019 at 2:12 PM
    #1
    Jrobtheginger

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    Jrobtheginger [OP] Member

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    Hello everyone,

    I am trying to run some courtesy lights that function as an extension of my dome lights. when doors are closed to shut them off when walking up to the truck for them to come on. i have been digging through the internet and my truck testing wires but i cant seem to figure it out. If anyone has done such a thing can you send me a link to a video or explain in detail what wire you spliced into to make them work. i wouldn't be upset to run them to the cargo lamp either but again i need to know what color wire to run them from and where the wire is located for my splice point.

    Thank you,
     
    Jrobtheginger, Jan 20, 2019
    #1
  2. Jan 20, 2019 at 2:22 PM
    #2
    na8rboy

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    na8rboy 18 DCLB Sport Cement

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    Look up the courtesy light mod in search box. They are lights that go on mirrors. May help with you what wires, you need to tap into. Same function your looking for.
     
    na8rboy, Jan 20, 2019
    #2
  3. Jan 20, 2019 at 2:25 PM
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    ACinOR

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    ACinOR Well-Known Member

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    I ran a relay that turns on the under lights whenever the truck bed light comes on. Which is whenever you open the door or use the bed light switch in the cab.

    91C976B2-C5EF-4AEF-9933-F47EE952237D.jpg
     
    ACinOR, Jan 20, 2019
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    Txexplorer, AKGSD and tjpratt like this.
  4. Jan 20, 2019 at 2:25 PM
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    Jrobtheginger

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    Jrobtheginger [OP] Member

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    Can you link that forum a whole bunch of different threads populate with that search?
     
    Jrobtheginger, Jan 20, 2019
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  5. Jan 20, 2019 at 2:27 PM
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    Jrobtheginger

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    Jrobtheginger [OP] Member

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    did you follow a video or DIY? if you did can you post a link or explain the setup in detail?
     
    Jrobtheginger, Jan 20, 2019
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  6. Jan 20, 2019 at 2:37 PM
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    Hstone556

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    Hstone556 Ain’ters gonna ain’t

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    give @DSIM a shout. he has built a device just for this purpose.
     
    Hstone556, Jan 20, 2019
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  7. Jan 20, 2019 at 2:38 PM
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    StayinStock

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    StayinStock Set it and forget it

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    Welcome to TW!
     
    StayinStock, Jan 20, 2019
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  8. Jan 20, 2019 at 3:35 PM
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    LA_Stu

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    LA_Stu Well-Known Member

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    Attached Files:

    LA_Stu, Jan 20, 2019
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    tjpratt likes this.
  9. Jan 20, 2019 at 3:53 PM
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    ACinOR

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    ACinOR Well-Known Member

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    The wire digram posted from another member will show you where you need to tap into. Important to run that tap to a relay then the relay controls the flow of power to the lights.
     
    ACinOR, Jan 20, 2019
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  10. Jan 21, 2019 at 6:23 AM
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    DSIM

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    DSIM Well-Known Member

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    DSIM, Jan 21, 2019
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  11. Jan 21, 2019 at 8:35 AM
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    Capt_Awesome

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    Capt_Awesome Well-Known Member

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    I have Amp Powersteps that have lights that act just like you are describing... Google the install instructions... They tied into wires in the door sill plates
     
    Capt_Awesome, Jan 21, 2019
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  12. Jan 21, 2019 at 11:12 AM
    #12
    Jrobtheginger

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    Jrobtheginger [OP] Member

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    would this work to make the underglows come on with dome lights if i wired a relay like so?

    dome light.jpg
     
    Jrobtheginger, Jan 21, 2019
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  13. Jan 21, 2019 at 4:02 PM
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    caribe makaira

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    caribe makaira Well-Known Member

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    No
     
    caribe makaira, Jan 21, 2019
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  14. Jan 21, 2019 at 4:07 PM
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    caribe makaira

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    caribe makaira Well-Known Member

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    Yellow wire is ground...tap into the Purple wire of the Cargo Lamp harness...Battery-fuse-Y wires one appropriate to added circuit, the other 18 awg to the 86 pin. 87 pin to your underglows, pin 85 to the purple wire.
     
    caribe makaira, Jan 21, 2019
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  15. Jan 21, 2019 at 4:17 PM
    #15
    caribe makaira

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    caribe makaira Well-Known Member

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    upload_2019-1-21_20-17-0.jpg
     
    caribe makaira, Jan 21, 2019
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  16. Jan 21, 2019 at 4:25 PM
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    Jrobtheginger

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    Jrobtheginger [OP] Member

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    so 86 and 30 will be power? kind of confused :/
     
    Jrobtheginger, Jan 21, 2019
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  17. Jan 21, 2019 at 4:28 PM
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    DrFunker

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    DrFunker Well-Known Member

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    DrFunker, Jan 21, 2019
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    Blais03 likes this.
  18. Jan 21, 2019 at 4:59 PM
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    caribe makaira

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    caribe makaira Well-Known Member

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    Yes just like the OEM Cargo circuit to the left...
     
    caribe makaira, Jan 21, 2019
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  19. Jan 21, 2019 at 5:22 PM
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    DSIM

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    DSIM Well-Known Member

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    86 - Negative trigger dome
    85 - 12v+ Constant (Battery)
    30 - 12V+ Constant (Battery)
    87 - Output

    And a capacitor across the relay coil to eliminate chatter. The negative trigger is a PWM from the computer to dim the dome. If you dont use a capacitor then the contacts will go back and forth causing chatter.

    Or sit tight till I get the modules back up and going.
     
    DSIM, Jan 21, 2019
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  20. Jan 21, 2019 at 5:34 PM
    #20
    caribe makaira

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    caribe makaira Well-Known Member

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    Hopefully you don't buy/use a relay with an internal diode...if you do then 85 is NEG...
     
    caribe makaira, Jan 21, 2019
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