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Has anyone modified the bed light to control aux ditch lights?

Discussion in '3rd Gen. Tacomas (2016+)' started by OnHartung'sRoad, Dec 3, 2019.

  1. Dec 3, 2019 at 12:19 PM
    #1
    OnHartung'sRoad

    OnHartung'sRoad [OP] -So glad I didn't take the other...

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    I am considering using my bed light circuit to turn on aux ditch lights mounted to the sides of my cabrack by adding a relay from under the bed light. I know about the leak risk, but can properly reseal it. Has anyone done this? If so, how did you do it and how did it go?
     
  2. Dec 3, 2019 at 12:28 PM
    #2
    Greg's Outdoors

    Greg's Outdoors Well-Known Member

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  3. Dec 3, 2019 at 12:39 PM
    #3
    vicali

    vicali tirekicker

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    You would tap the +12v near the lamp and use it to trigger the relay. Power and ground for the lights would still come from the batt on a decent gauge wire.

    Cargo lamp fuse is only 7.5a so not enough room to straight power the lights from there.
     
    OnHartung'sRoad [OP] likes this.
  4. Dec 3, 2019 at 12:42 PM
    #4
    Cav_BluTRD

    Cav_BluTRD Instagram: UploadAdventure

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    The cargo lamp fuse will power side lights.
    But they will not turn on and off with the rocker switch on the dash (ask me how I know)
     
    Greg's Outdoors likes this.
  5. Dec 3, 2019 at 12:46 PM
    #5
    Blais03

    Blais03 Guess I'll bring a spare wheel bearing...

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    Too much to list
    Thats easy. Just use a relay.
     
  6. Dec 3, 2019 at 12:48 PM
    #6
    Cav_BluTRD

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    Someone posted how to do it off the cargo rocker switch in the Uptopoverland thread. I’m to lazy to look back where
     
  7. Dec 3, 2019 at 12:48 PM
    #7
    vicali

    vicali tirekicker

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    Fuse is before the dash switch.. if you tapped after the switch it would control it.
     
  8. Dec 3, 2019 at 12:49 PM
    #8
    vicali

    vicali tirekicker

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    someone call @caribe makaira
     
  9. Dec 3, 2019 at 12:54 PM
    #9
    Cav_BluTRD

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    The wiring after the switch isn’t enough power (ask me how I know too lol)
    You gotta run a relay from one of the switch wires. I forgot which one.
     
  10. Dec 3, 2019 at 12:58 PM
    #10
    vicali

    vicali tirekicker

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    It would trigger a relay, that's what OP is looking for.
     
  11. Dec 3, 2019 at 2:18 PM
    #11
    OnHartung'sRoad

    OnHartung'sRoad [OP] -So glad I didn't take the other...

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    Thanks for the reply. Yeah, I have heavy gauge positive and negative lead going from an auxiliary battery to a fuse block in my bed and was going to power and ground off that, and using a heavy amp relay switched on and off through the cargo light.

    I was wondering if anyone had actually done it and if there any suggestions for accessing the cargo light and other ideas for the project. It just seems like a very easy way to do it for those of us who have a shell and rarely use the cargo light anymore for anything else, otherwise it’s a waste of a really good switch already installed in the dashboard.
     
  12. Dec 3, 2019 at 2:20 PM
    #12
    OnHartung'sRoad

    OnHartung'sRoad [OP] -So glad I didn't take the other...

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    what did you do...?:notsure:
     
    Last edited: Dec 3, 2019
  13. Dec 3, 2019 at 2:29 PM
    #13
    vicali

    vicali tirekicker

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    I'm a fan of wiring in my own circuits, I try to avoid any splices or piggybacks on the OEM system.
    Addafuse and another switch would be my route.
     
  14. Dec 3, 2019 at 2:29 PM
    #14
    OnHartung'sRoad

    OnHartung'sRoad [OP] -So glad I didn't take the other...

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    Cav_BluTRD likes this.
  15. Dec 3, 2019 at 2:31 PM
    #15
    OnHartung'sRoad

    OnHartung'sRoad [OP] -So glad I didn't take the other...

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    I agree, but it’s totally an unused circuit now, so in my case this would be a good way to do it. Besides, I’m planning on keeping my truck until just before it dies.
     
  16. Dec 3, 2019 at 4:33 PM
    #16
    caribe makaira

    caribe makaira Well-Known Member

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    OnHartung'sRoad [OP] and vicali like this.
  17. Dec 4, 2019 at 7:02 AM
    #17
    OnHartung'sRoad

    OnHartung'sRoad [OP] -So glad I didn't take the other...

    Joined:
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    Somewhere in the Mojave Desert...
    Vehicle:
    2017 Tacoma TRD 4x4 (formerly 2002 TRD 4x4, 1995 4x4 4Runner, 1985 4x4 Toy PU) ... and RIP’s (rust in pieces) to a Bronco II 4x4 & S10 Blazer 4x4
    Thank you for the post, that looks to be very helpful! I’m curious though, will a basic five pin 12 V relay overload the hot wire going to the cargo light? that’s what Cidgel did here on step 3:

    https://www.tacomaworld.com/threads...pping-conus-only.599113/page-51#post-21704559

    It just seems like it would be so much easier to tie it’s low amp coil into the positive wire feeding the light up in the ceiling, especially for controlling lights that are mounted to the roof racks and with the power feed from my auxiliary power source and fuse box I already installed in the bed of the truck... not sure about the main advantage of what you posted in that case...
     
    Last edited: Dec 4, 2019
    Cav_BluTRD likes this.
  18. Dec 4, 2019 at 7:06 AM
    #18
    TacomaUSA

    TacomaUSA Cross Country Tacoma

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    Hang on....the 3rd gen comes with a bed light?!

    Well that's awesome. Lol
     
  19. Dec 5, 2019 at 10:05 PM
    #19
    OnHartung'sRoad

    OnHartung'sRoad [OP] -So glad I didn't take the other...

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    OK well this will be interesting, I am now planning on putting a junction box underneath my Prinsu cabrack for accessory 12 V power up on the roof (the source is a third battery I have in the bed). I will put a blue seas waterproof cigarette plug up there for powering various accessories I use outside and for my RTT, such as phone, camera and drone chargers, lights and even a diesel heater, along with a relay to run my ditch lights mounted on the sides of the rack. I will post about it here.
     
    Last edited: Dec 6, 2019

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