Looking to tap accessory wire

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!

 

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

 

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.

 

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.

 

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 ..

 

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/

 

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.