“Ignition on” wires for 12 volt redarc equipped 24 volt truck

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Joined
Aug 10, 2017
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Location
Okinawa, Japan or Las Cruces NM
Hello all,
I have a 24 volt hzj 77 with a red arc battery charger (bcc 1220) going to a third battery so I could have some 12 volt power in my rig . I wired it all up and everything came out fine. What I can’t figure out is how wire my 12 volt devices so they only work with the key in the on position. I wired an aux fuse box in the front and the back of the truck, but as it is wired now everything hooked to the fuse boxes are always “hot”. Sorry if this has already been gone over somewhere already, but any help would be appreciated.

AC
 
Not sure what the Redarc device looks like, but couldn't you tap a wire into any other "on" 24V source, and use it hit a relay, then power your fuse blocks from that? And convert it down to 12V where you need to?
 
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