Aux power tie-in for relay

Hello all,
I need suggestions for where to tie in to aux power for my relay. Trying to keep my wiring really clean! Any suggestions would be GREATLY appreciated. Thanks!

 

Auxiliary power as source or trigger to the relay?

 

To trigger the relay

 

The aux relay box can be removed by pulling up on it (squarely)
It has a removable cover underneath.
Identify you choice tap.
Place crimped to small gauge wire a male spade terminal.
Wedge the terminal between the space and the relay terminal, tape in place.
Route wire to relay from underneath...

 

This sounds like just what I need. Can you elaborate? Maybe with a photo? It the aux relay box in the engine compartment? Thanks!

 

Detail of the bottom cover "latch"...

 

Thank you!

 

Trying again. Thanks Caribe Makaira for the suggestion, but I can’t find that the 2017 Tacoma has an Aux Relay Box. Does anyone know of somewhere in the engine compartment that I can tie into aux power to signal my relay? Thanks!

 

So, got to the relays. Sorry I’m a wiring newbie, does the whole box come out? Do I route underneath? I still don’t see what to tie into. Thanks

 

Pull box straight up, firmly using both hands...just enough to release it. Rotate to view the underside...you'll see the latch holding the bottom cover.

If it's too stuck, then insert (red circle) something small to push the "latch" to the left.

 

Many many thanks to Caribe Makaira for walking me through getting my relay box out to make an aux connection to signal my relay. You’re awesome!!