Yeah looks like you have a factory fitted aux battery with some extra looms the same as mine. I just removed all of the extra RAC stuff including the stuff that goes forwards and will install my leisure stuff completely separate, and leave all that alone. Whilst you’ve got it like that might be worth running your battery pos from the starter battery to wherever you’re putting a leisure battery. And I also ran a couple of speaker cables from the head unit into the back for future fit.
If you remove all the RAC loom you’ll lose your power to rear view camera. So I just took a pos and a neg to the screen from under the passenger seat and a trigger wire from reverse light too. But your pos needs to be live when the ignition is on, if you take it direct from that battery it will be live all the time even when the van is off. There's a little yellow cable on a purple plug under the seat that I used, not sure what it was doing on the RAC stuff but I’ve used it.
