Split charging system
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As we are running a standard battery as the vans main battery and AGM as the leisure I did not want the two automatically joined every time the engine runs (as an auto system)
I decided to go with a more manual system so I can choose if I need the boost or not

I fitted a AE8A RL180 Automotive Relay Black 100A 4 Pin Automotive Relay - from ebay
There is now a  100 amp relay fitted to join the main van battery to the leisure batteries, this is not normally connected (energised)
To link the main to the leisure batteries the van must running and the red switch on the dash switched to on (down) - there is a built in delay circuit so the relay pulls in after 15 seconds this is to avoid high start current going through the relay.