1. Welcome to Tundras.com!

    You are currently viewing as a guest! To get full-access, you need to register for a FREE account.

    As a registered member, you’ll be able to:
    • Participate in all Tundra discussion topics
    • Transfer over your build thread from a different forum to this one
    • Communicate privately with other Tundra owners from around the world
    • Post your own photos in our Members Gallery
    • Access all special features of the site

Wiring Light bar onto existing fog light switch

Discussion in 'Lighting' started by sta_f0u, May 19, 2020.

  1. May 19, 2020 at 4:32 AM
    #1
    sta_f0u

    sta_f0u [OP] New Member

    Joined:
    May 19, 2020
    Member:
    #46772
    Messages:
    48
    Gender:
    Male
    First Name:
    Jon
    Nevada
    Vehicle:
    2017 White Tundra Limited 4x4
    New owner here!

    So I have seen a few post online and even on this forum, but have not found an answer or a guide on if it's possible or has been done.

    I have a 2017 Tundra Limited. I've purchased a new front bumper. The new bumper will not have fog lights but will have a light bar that i've purchased with it.

    My goal is to hopefully just have the existing fog light switch (a turn dial next to the headlight) to activate the light bar. I'm sure if I'm using the existing switch, that the same rules with the current fog lights will be in effect ex: Can't use lightbar with high beams on. Which is fine.

    Is there a way I can make this happen. I've learned a bit about relays and they make sense, just want to know if there's a way I can run the existing fog light switch to the relay, and if so where can I find that switch wiring and how to wire it to the relay.

    Thank you for your time!
     
  2. May 19, 2020 at 4:56 AM
    #2
    NewImprovedRon

    NewImprovedRon Hey! Get off my grass!

    Joined:
    Jul 8, 2015
    Member:
    #1501
    Messages:
    12,462
    Gender:
    Male
    First Name:
    Ron
    Bentonville, AR
    Vehicle:
    2015 Radiant Red TSS Doublecab 4X4 Off Road
    Deck rail system, Bed divider, door sill protectors, LED reverse light bars, Aries Bull Bar with 28" 180 watt LED light bar, LED step lights, LED bed lights, driver-side grab handle, TRD Rear Sway Bar, BedRug bed mat and tailgate mat, Morimoto Fog Lights, more to come.....
    You can use a relay for your new light bar and have the positive wire from your existing fog lights be your trigger wire to turn on the relay. The result should be that you turn on your fog light switch, the trigger wire closes the electromagnet in the relay, and the relay turns on your light bar. Just make sure you use the correct gauged wiring for your light bar (watts divided by 12 volts = amps you are adding to the system. Positive wire from light bar to relay, negative wire for light bar to good ground point, trigger wire from fog light circuit to trigger on relay, battery positive to relay, and ground the relay with the same gauge wire you used from the light bar to the relay. Also, make sure you install an in-line fuse from the battery positive. I attached some information pertaining to my light bar install with a relay and illuminated switch. You would just want to follow the connections for the relay.
     

    Attached Files:

    West Texas Tundra and jeremyd like this.
  3. May 19, 2020 at 4:57 AM
    #3
    sta_f0u

    sta_f0u [OP] New Member

    Joined:
    May 19, 2020
    Member:
    #46772
    Messages:
    48
    Gender:
    Male
    First Name:
    Jon
    Nevada
    Vehicle:
    2017 White Tundra Limited 4x4
    Awesome I will take that information and learn from it. Your gif explains my reaction perfectly. Thank you!
     
    NewImprovedRon likes this.
  4. May 19, 2020 at 5:04 AM
    #4
    NewImprovedRon

    NewImprovedRon Hey! Get off my grass!

    Joined:
    Jul 8, 2015
    Member:
    #1501
    Messages:
    12,462
    Gender:
    Male
    First Name:
    Ron
    Bentonville, AR
    Vehicle:
    2015 Radiant Red TSS Doublecab 4X4 Off Road
    Deck rail system, Bed divider, door sill protectors, LED reverse light bars, Aries Bull Bar with 28" 180 watt LED light bar, LED step lights, LED bed lights, driver-side grab handle, TRD Rear Sway Bar, BedRug bed mat and tailgate mat, Morimoto Fog Lights, more to come.....
    It isn't as difficult as it sounds. Plus you won't have to be running wires through your firewall inside the cab since you will be using your fog light switch to turn on the relay/light bar. Since all your wiring will be done under the hood, your wiring runs will be short as well. You got this! I would also get some wiring loom to place your added wiring into for protection.
     
  5. May 19, 2020 at 5:10 AM
    #5
    sta_f0u

    sta_f0u [OP] New Member

    Joined:
    May 19, 2020
    Member:
    #46772
    Messages:
    48
    Gender:
    Male
    First Name:
    Jon
    Nevada
    Vehicle:
    2017 White Tundra Limited 4x4
    I'm excited about it! Just purchased the truck 2 weeks ago and I've already purchased a few mods and the list just gets longer. I'm very thankful for the help and hopefully one day I'll be able to pass on the knowledge down the line.
     
    NewImprovedRon likes this.
  6. May 19, 2020 at 7:03 AM
    #6
    NewImprovedRon

    NewImprovedRon Hey! Get off my grass!

    Joined:
    Jul 8, 2015
    Member:
    #1501
    Messages:
    12,462
    Gender:
    Male
    First Name:
    Ron
    Bentonville, AR
    Vehicle:
    2015 Radiant Red TSS Doublecab 4X4 Off Road
    Deck rail system, Bed divider, door sill protectors, LED reverse light bars, Aries Bull Bar with 28" 180 watt LED light bar, LED step lights, LED bed lights, driver-side grab handle, TRD Rear Sway Bar, BedRug bed mat and tailgate mat, Morimoto Fog Lights, more to come.....
    Here is a wire gauge guide to help with what wire gauge you may need.
     

    Attached Files:

  7. May 19, 2020 at 7:21 AM
    #7
    jeremyd

    jeremyd 2014 Crewmax SR5

    Joined:
    May 9, 2016
    Member:
    #3336
    Messages:
    1,274
    NV
    Vehicle:
    2014 SR5 CM 4X4
    ProComp 7" 35/12.50/18 -11
    That's exactly how I did mine, I snagged the trigger wire for the relay straight from the 12 volt wire going to the fog light. Everything was on the engine firewall side. No need to wire anything inside the cab. Just simply turn on the fog lights.. Good luck, I'm sure it will turn out great.
     
    NewImprovedRon likes this.
  8. May 19, 2020 at 12:38 PM
    #8
    sta_f0u

    sta_f0u [OP] New Member

    Joined:
    May 19, 2020
    Member:
    #46772
    Messages:
    48
    Gender:
    Male
    First Name:
    Jon
    Nevada
    Vehicle:
    2017 White Tundra Limited 4x4

    Were you able to find a way to bypass the high beams from turning off the light bar? I'm a Nevada native as well. Clark County!
     
  9. May 19, 2020 at 12:58 PM
    #9
    jeremyd

    jeremyd 2014 Crewmax SR5

    Joined:
    May 9, 2016
    Member:
    #3336
    Messages:
    1,274
    NV
    Vehicle:
    2014 SR5 CM 4X4
    ProComp 7" 35/12.50/18 -11
    No, I never bypassed it. The light bar would turn on using the fog light switch in regular mode only.
     
  10. May 24, 2020 at 10:51 AM
    #10
    Wintersun

    Wintersun New Member

    Joined:
    Jan 7, 2019
    Member:
    #24102
    Messages:
    45
    Gender:
    Male
    The reason that fog lamps are mounted as low as practical is to minimize glare and a light bar works best in my own experience when it is mounted as high and as far back as possible (front edge of a truck cap has worked the best for me).

    With different lights it is a good idea to have separate switches so you can decide which to turn on and which to leave off depending upon the situation.
     
  11. May 24, 2020 at 11:46 AM
    #11
    Stumpjumper

    Stumpjumper New Member

    Joined:
    Sep 15, 2016
    Member:
    #4546
    Messages:
    2,394
    Gender:
    Male
    Fate, Tx
    Vehicle:
    2017 Tundra TSS 4x4
    Go to the lighting section and do a search. A lot Tacoma owners have modified the relay to accomplish this. Not sure if the Tundra fix is the same. I have seen posts on this here.
     
  12. May 25, 2020 at 9:10 PM
    #12
    sta_f0u

    sta_f0u [OP] New Member

    Joined:
    May 19, 2020
    Member:
    #46772
    Messages:
    48
    Gender:
    Male
    First Name:
    Jon
    Nevada
    Vehicle:
    2017 White Tundra Limited 4x4
    The bumper I'll be installing has a lightbar slot so just filling that in and I agreee with the own switch logic. I think I am going to end up wiring it to its own switch and just remove the fogs for now and when the time (money) is right I'll buy fogs and connect those to the existing fog switch.
     
  13. May 26, 2020 at 8:59 AM
    #13
    BlueBottle

    BlueBottle not a PRO

    Joined:
    Sep 17, 2016
    Member:
    #4572
    Messages:
    5,069
    Vehicle:
    '16 Platinum 4x4
    See fine print
    Here you go. I did this with my light bar to my high beams. Only difference is you want it to be activated with your fog lamps. In theory, you can replace where 85/86 tap into and as long as it is a 12v source, it will activate your new light. Hope this makes sense. All you would need to get is a relay, wiring terminals, Wire, inline fuse. The Orange circles are wiring connections if that makes sense. Make sure your inline fuse is as close to the battery as possible. About 12" is about right.Fuse size will be dictated by your light bar. LMK if you have any other questions.

    If you want to change your factory fog circuit so it doesn't turn off when you use your high beams, I used FogLightEddiev1 and it worked on my 2016. https://www.tundras.com/threads/diy-fog-light-mod.371/

    Fog-LB Relay Wiring.jpg
     
    sta_f0u [OP] and NewImprovedRon like this.
  14. Jun 11, 2020 at 3:36 AM
    #14
    buckrub71

    buckrub71 New Member

    Joined:
    Jun 2, 2016
    Member:
    #3510
    Messages:
    274
    Gender:
    Male
    Vehicle:
    2016 Bronze 1794 CM

Products Discussed in

To Top