How do I get constant 12 volt power from trailer wiring?

Remove the Driver's side kick panel, you'll see a similar view.
Read this to remove the panels required:
2016-2019 Toyota Tacoma Fog Light Mod! (Step by Step Picture Heavy)

 

Thank you kindly.

 

Well, tried this. This did not work. Didn't get constant 12 without the truck running and it disabled my brake controller.

 

It's not meant for those with a need to have a break controller. And, you must've tapped the wrong wire in the T12. (If you place the 12 gauge jumper in the T7)

 

I figured out what the issue is. Your schematic sends constant power to the trailer brake pin. That's unfortunately not what I need. I need a functional trailer hookup that sends power to the aux pin.

 

Aux pin?

 

That's what I ended up doing. Thank you!

 

This could another solution:
Remove Relay and place jumper with proper sized terminals and 10-12 awg wire and lower the circuit fuse amps. Also place a inline fuse to the T12 connector tap.

 

I'm having a hard time finding the right size blades, they seem oversized?

 

I think they are 312 series size. (8mm)

 

I added the towing breaks, all good, not I want to add a breakaway switch, battery powered, need the 12v from the 7way plug to charge the battery, no luck, the thing is dead, seems like I'm not the only one on this boat, any other idea what we. May be missing?
Tia

 

Vehicle needs to have engine running to activate the IGN circuit that sends juice to the battery charge relay coil side.

 

My engine is running, still, no juice

 

Verify this fuse:

As in remove and test it with a MultiMeter, no just a glance.
Is always "HOT", so careful or remove the negative terminal connector to the battery before testing.

 

Ohhh, that's it!, blown! Thank you

 

Did you complete this? I'd be interested in a pre wired harness that can pull the full 12v@30a