Wiring existing accessories to second battery

Hey everyone, I'm new here and new to the Tacoma world, so pardon me for sounding dumb. I have a question on wiring the vehicles factory accessories to my secondary battery. I haven't been able to find this topic through my searches. I got a shell and am converting my 08 tacoma into a camper. I installed the second battery using the wirthco battery doctor, it's working great. I am just curious on an easy way to wire the vehicles accessories(lights, radio, cigarette lighter, etc) to run off this second battery and not my starting battery. Is there a wire I can reroute to power these or do i have to individually rewire these through a new fuse box and to my secondary battery?
What do you guys do? Your help would be greatly appreciated

Thanks!

 

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