I have fit a leisure battery in my van, its under the back seat at the moment wired directly to the starter battery and when I stop, I disconnect the starter battery manually. I have a switch that will disconnect the starter battery when the ignition is switched off but obviously before I wire that in, I need to wire the fuse board directly to the leisure battery. I hope this makes sense!

What I don't currently know is, where is the main electrical feed to the fuse box? Is there just one? and where is the best place to access it and re route it to the leisure battery?
Any advice would be great,
