Big Jim wrote:Al's way is good , but that will make everything off the new box permanently live , you may want to have it ignition live , so you don't have to remember to switch things off . I have another fuse box wired in next to the old one supplied from an ignition fed live .
Good point big Jim.
Your absolutely right. The extras that I have on there are just a feed for the 12 volt socket which I wanted live so I could charge the phone when away from the car, for example when at Pateley in the tent I could have phone in car on charge without ignition on. I also thought about having a little LED that does nothing on the dash. This I could also wire up to that fusebox with a tiny rated fuse.
For the OP's purposes, your switched live is probably the better solution.