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Looking to tap accessory wire

Discussion in '5th Gen 4Runners (2010+)' started by NM4Runner, Nov 24, 2017.

  1. Nov 24, 2017 at 6:28 PM
    #1
    NM4Runner

    NM4Runner [OP] New Member

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    Hi all -

    2015 SR5 Runner. I would like to add an internal accessory fuse box to run various things. I want to tap directly into the ACC/IGN so that the fuse box has power when the ignition is on or is in the acc position. Can anyone shed some light where I can tap into that? I would prefer not to tie into an existing circuit (like a power plug, etc.) as I don't want to vampire off an existing fuse. Is there a main wire I can tap before it hits the internal fuse box?

    Edit: might be more accurate to state I want to locate (if one exists) a relay that provides 12V power that is in the system as an add-on that may not be used. I have read about the ground side switch system in these.

    Thanks in advance!
     
    Last edited: Nov 24, 2017
  2. Nov 28, 2017 at 8:38 PM
    #2
    MeefZah

    MeefZah Curmudgeonly

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    I am not familiar with a dedicated, unused acc "wire" you can tap into.

    If you want to install a stand alone fuse box to power other stuff, and want it to be switched with the ignition, my druthers would be to wire it through a relay to battery. Run the trigger from the relay to an acc circuit in the fusebox using a Mini-ATO tap, and you would be good to go.

    If you only have a few low amp draw devices that you plan on running, I'd just wire them directly to acc circuits in the fusebox using the mini-ATO taps. I've found those to work well for extra power ports, CBs, GPS units, the sort of thing that draws under 5a or so. No reason to have a separate fusebox if you only are going to have 1-3 devices.

    Stolen image

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    Last edited: Nov 29, 2017
    NM4Runner [OP] likes this.
  3. Nov 28, 2017 at 8:58 PM
    #3
    NM4Runner

    NM4Runner [OP] New Member

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    MeefZah - thanks, I think the relay to acc to battery sounds like a plan. Low power devices for sure, but I am thinking 5-7 devices after a bit. I want to run three power lines up to the rear view mirror (the unit up there behind the glasses case) to plug in my front-facing cam, a future radar detector, and the multi-port monitor for my side mirror cameras. Then put in runs for a CB, LED lights around the cab, stuff like that. I never thought about a relay with the trigger to an acc circuit.
     
  4. Nov 29, 2017 at 12:27 PM
    #4
    TN_TRAIL

    TN_TRAIL New Member

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    oh the list....!
    The relay is the absolute best way to go for any real current draw. His other idea would, as he stipulated, be great for a low-amp draw device.
     
  5. Dec 9, 2017 at 5:17 AM
    #5
    j cat

    j cat New Member

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    using the ignition switch power to a control relay and then power to your accessories from a fused run connected to battery is good . just be sure to properly fuse each wire run to what your powering. also a fuse @the battery is required .

    select a control relay with the ability to handle like 30-40 amps . 120 volt power inverter will draw extremely high amps .. so if used do the calculations on amps used.. and wire size ..
     
  6. Jul 1, 2018 at 7:59 AM
    #6
    HarveyElmore

    HarveyElmore New Member

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    I'm looking to power my Dashcam which I already have the harness for the Rexing cam. I had hoped to jump on a fuse slot under the dash with one of the fuse taps. Anyone have an idea which would be best since the Dashcam doesn't pull too many amps ? Here's my harness: https://store.rexingusa.com/product/rexing-mini-usb-hardwire-kit/
     
    redhorse likes this.
  7. Jul 3, 2018 at 8:22 AM
    #7
    MeefZah

    MeefZah Curmudgeonly

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    I assume you want it ignition switched? If so, any fuse will work with the exception of... I think... #24 (25?). I always forget. One fuse is always hot, I think it's #24. I should really look. But I won't.

    When using those mini ATO fuse taps, I always choose the lowest amperage fuse that controls the least important function, so if it blows I am not losing, say, the fuel pump. Good choices are the cig lighter fuse, interior lighting fuse, etc.
     
    4Oregon, redhorse and HarveyElmore like this.

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