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Wiring dual fuse block.

Discussion in '3rd Gen. Tacomas (2016+)' started by LTG4087, Oct 8, 2019.

  1. Oct 8, 2019 at 4:07 PM
    #1
    LTG4087

    LTG4087 [OP] Well-Known Member

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    I currently have a 12 circuit Blue Sea fuse block all wired up, but would like to get a split unit (or a second one) that would be an acc switched circuit. My though is to add a relay and trigger it with a fuse tap that is switch power from the underhood fuse box. Then wire higher amp wire from the constant power side to the rely, then that connected to the input on the switch power side. So when switch power is on the relay closes and routes power from constant side to the switched side. Any of you wiring gurus have any thoughts one that?
     
  2. Oct 8, 2019 at 4:08 PM
    #2
    fatfurious2

    fatfurious2 EAF YO

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  3. Oct 8, 2019 at 4:09 PM
    #3
    RyanDCLB

    RyanDCLB Well-Known Member

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    I thought about it, but opted for the LVD as found here. Either way, there are many combinations including having one side of the 12 blade switched and one side using the LVD. GL!
     
  4. Oct 8, 2019 at 5:57 PM
    #4
    RyanDCLB

    RyanDCLB Well-Known Member

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  5. Oct 8, 2019 at 7:32 PM
    #5
    LTG4087

    LTG4087 [OP] Well-Known Member

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    Currently have the "standard" and would probably go with the split or perhaps an additional smaller (4 or 6 circuit) one. Either way, I'm thinking of getting the power to the second side via a relay triggered by tapping into a switch circuit from the fuse box and the power coming from the constant power side. My question is, is this a reasonable way to do this or is there someplace to tap into at least a 30 amp source of switched power.
     
  6. Oct 8, 2019 at 7:42 PM
    #6
    SSG (03)TACOMA

    SSG (03)TACOMA SSG TACOMA

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    Mine, mounting tomorrowIMG_20191008_180354116.jpg
     
  7. Oct 8, 2019 at 7:44 PM
    #7
    SSG (03)TACOMA

    SSG (03)TACOMA SSG TACOMA

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    This is what a other guy did here on Tacoma world8971B9D9-866D-478C-A7C0-F325215B31A2 (1).jpg
     
    ancient11 likes this.
  8. Oct 8, 2019 at 7:44 PM
    #8
    RyanDCLB

    RyanDCLB Well-Known Member

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    Have you looked at the Stinger battery isolator and relay?
     
  9. Oct 8, 2019 at 8:00 PM
    #9
    LTG4087

    LTG4087 [OP] Well-Known Member

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  10. Oct 8, 2019 at 8:06 PM
    #10
    LTG4087

    LTG4087 [OP] Well-Known Member

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    I currently have something similar. But these circuits are all constant power, I want to add some switched (only on when ignition is on) circuits.
    Fuse-box-2opm.jpg
     
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  11. Oct 9, 2019 at 3:48 AM
    #11
    Redmann

    Redmann DILLIGAF

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    So you want a switch that will close the relay, with a lower amperage wire, which then routes the higher amperage wire to another switch? Am I reading that right?

    I mean, anything is possible. Just follow the flow of electricity. Put in line the various things that you want to i.e. a relay, switch, or accessory.
     
  12. Oct 9, 2019 at 8:20 AM
    #12
    LTG4087

    LTG4087 [OP] Well-Known Member

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    Yeah that's pretty much it. End goal is to have a small underhood fuse block that provides switched (ignition on only) power. Like this: (excuse my non professional electrical drawing skills)
    Fuse-set-up3.jpg
     
  13. Oct 9, 2019 at 8:59 AM
    #13
    smdcbr

    smdcbr Well-Known Member

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    That looks OK to me. You probably know this, but I think you need to ground the relay.
     
  14. Oct 9, 2019 at 9:05 AM
    #14
    Redmann

    Redmann DILLIGAF

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    Use an add a fuse that is on an "ignition on" circuit in the oem fuse panel. I just did that for power to my compressor switch. The compressor switch only will be powered up when the truck is on. Easy to find with a meter. No power when truck is off, 12volts when the truck is on.

    Take the wire from the add a fuse and run it to a relay. Use the pin that will close the relay when the power is applied. Take your feed for the 2nd fuse block, from whatever heavier amperage source you want, and go to the other part of the relay, then to the fuse block. This will power up the 2nd fuse block and will always be on while the truck is running. turn the truck off, fuse block turns off.

    Or if you want an extra switch in there to solely turn on the 2nd fuse block even when the truck is running (meaning while the truck is on, you can manually turn off the 2nd fuse block) then take the add a fuse wire to the switch, then outa the switch to the relay. Then continue like I said above with the heavier wiring to feed the fuse block.

    In either instance, I'd fuse the feed side of the higher amp wire, between the source and the relay, with an inline fuse holder of some sort.

    There's more than one way to skin a cat. Pick what you like and go with it.
     
  15. Oct 9, 2019 at 9:24 AM
    #15
    computeruser6

    computeruser6 Nuclear Janitor

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  16. Oct 9, 2019 at 9:24 AM
    #16
    RyanDCLB

    RyanDCLB Well-Known Member

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    My idea was something like this:

     
  17. Oct 9, 2019 at 9:24 AM
    #17
    LTG4087

    LTG4087 [OP] Well-Known Member

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    Yes, I'm intending on doing a fuse tap from the OEM fuse panel to pick up the switched power to activate the relay and thus add full power to the second side. That's what's represented in my little drawing.
     
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  18. Oct 9, 2019 at 9:43 AM
    #18
    LTG4087

    LTG4087 [OP] Well-Known Member

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    In this set up, what actuates the relay?
     
  19. Oct 9, 2019 at 10:02 AM
    #19
    RyanDCLB

    RyanDCLB Well-Known Member

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    An add-a-fuse from an ignition circuit on the fuse panel. :thumbsup:

    Edit: instructions uploaded (see 2nd part), also, some reviewers are saying does not work good in below freezing temps...
     

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    Last edited: Oct 9, 2019
  20. Oct 10, 2019 at 3:43 AM
    #20
    caribe makaira

    caribe makaira Well-Known Member

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    70amp Relay with positive or negative activation .

    Relay Switches Positive voltage to load.

    ¼ amp relay activation great for ECU negative outputs.
     

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