Wiring inside engine compartment.  The relays are at rest, where the voltage from the leisure battery is relayed to the Zig control panel.
The Leisure battery is contained in locker at the rear offside of the Motorhome.
The negative terminal, of the leisure battery, is not fused in the Wanderer, but recommended.

When it comes to cable sizes, see: 
http://www.gtsparkplugs.com/WireSizeCalc.html

I have checked this drawing and found it to be correct.

2012 Update of Split Charge Relays

The fuse panels and relays have been renovated. Below is shown the update.

Above is the new split relays & relay bases and fuses to be fitted.

     In my Wanderer the 5Amp fuse 2 is not used, I suspect this is a build error! I have fitted the Ignition Switch cable to this fuse then to the relays, as can be seen in the dotted red line of the drawing.  The alternator connector will then go to the dotted red line input and not to pin 86.

     Being concerned about the leisure battery, whether it was being charged I have fitted a panel voltmeter on Re 1. terminal 30. This gives and indication when the ignition is turned on and alternator is producing charge voltage.
     I have found this voltmeter will discharge the leisure battery if left on for long periods, so I have fitted a switch to turn it off when the vehicle is idle or in storage.