Aux Battery powered fuse box tied to ignition?

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Maybe my search skills are lacking today. I've found lots of interesting configurations but can't find out how to do this.

I want to run an aux fusebox in the center console, that's powered by the aux battery, but is only on when the ignition is on.

It's probably because I don't understand relays, but how could I do this?

I plan to run extra Blue Sea 5.2V USB power outlets in the console and outlets for the GPS, CB, future Ham Radio etc (I realize that there are 3 outlets up front already. But 2/3 are exposed and result in DC adapter wires running everywhere. I'd like to mount new outlets out of site). Is there a better way to do this that I'm not thinking of?

It seems like it'd be much easier to tap into that unused 50 amp slot in the underhood fuse box that's labelled glow. Or even tap into the 15amp circuit that powers the cigarette lighter. But I'd like to run as many accessories off the aux battery as possible.

This probably won't effect the solution to the question but the plan is to run a really over kill (1/0 gauge), hot wire from the aux battery, to a blue sea 150amp circuit breaker (under the hood),under the truck along the frame rail, into the cargo area where it will power an inverter in the future. Today, I will power a blue sea fuse box, that powers aux outlets in the cargo area. One of which will be powering my fridge. Follow up question for this part of the wiring. Do yall think I need to run a giant ground wire from the battery to the rear also? Or can I just run a 1/0 g ground wire from the inverter and fusebox to the chassis/frame in the rear?
 
Very easy. Get a high current relay or solenoid and place it in-line between the aux battery and the center console fuse box. Connect an ACC wire to the activate the relay and you are in business.
 
Thank you. Could the ACC wire used to activate the solenoid just plug into any hot wire that's connected to the iginition? For example, the current 12v outlets' wiring?

Exactly! Tap into the hot wire of the 12V outlets to trigger the relay for the new fuse block. The amount of current to trip the relay/solenoid is very low.
 
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