I am collecting my new van in a bit over a week and have my jobs to do.
On my last van I only had one water tap so fitted an in-line switch under the sink. This meant I could isolate it from the 12v supply and leave the system open to breath over winter storage whilst the rest of the 12v system remained live.
With the newer vans and fancy fuse box is it possible to flip a switch and isolate the water pumps, or will i need to install a switch near the pump?

Colin

Thanks, that means I am half way there without any work. I would prefer just to isolate the pump feed as I can then leave power on to interior lights.

Colin

That's another option. I downloaded a 2014 manual that shows the water pump and toilet share the same fuse. As you say it is trial and error, or definetly was on the French vans as electrics in practice did not match what they should be.
I may end up going for something like this, or just fit a simple switch under the seating next to the tank.

water isolation switch.jpg - Bild entfernt (keine Rechte)

Colin