A while back I picked up a 12V power distribution box second-hand with a view to putting it on top of one of my mounts to provide 12V power to all the attached bits and pieces whilst only requiring a single supply cable from the pier:
I thought I’d open it up just to see what was inside, which turned out to be not very much at all…
And then I realised that the instructions even give a rough circuit diagram.
The connectors look very good. I might have to pinch a few ideas from this in the future.