Leisure battery location

We have just purchased the van and there are two batteries. One located under the drivers seat ( RHD) and one under the passenger seat. Which one is the leisure battery please ?
Many thanks.

Don't know, but if you need to know in a hurry, follow the wires. It will be the one that goes back into the habitation area to join up with the hook-up charger unit.

I would guess the one under the driver's seat. Do I win the coconut? 

Do you have a multimeter? If yes then switch every light on and check voltages before and after switching lights on. You should see a drop with lights on from the leisure battery.

The vehicle (starter) battery should have heavier cables than the leisure battery. Otherwise do as Paul suggests with a multimeter

Hi
Welcome to the forum from Bridington 
Boaby