The main battery on my Ford Transit based Caravel lives under the drivers seat as does another battery!I just found the front battery to be dud.It was a Vartex? leisure battery.I v'e replaced it with a identical battery but am confused as to it's purpose!!If I remove the inline fuse from the leisure battery under the dinette seat nothing works.Both the positive leads on the batteries under the seat go onto a small black ford box and if I put a meter they are are interconnected so is the front battery a second battery for the chassis /cab?and not a leisure battery after all although the one I took out was so marked.on my control panel I can switch between aux/veh..I never us the veh setting in case it runs the main battery down but is their some kind of failsafe device.Both my workshop manual and the Buccaneer one don't mention the purpose of the front battery.Anyone know?