Transit custom

[Mintmint55]

Hi I have had a leisure battery with a spit charger and 240 hook up fitted on my transit custom 2014 after being away for the week end with a site hook up every thing in the van worked fine but when travelling home all the warning indicators on the van started to sound fuel gage not working ect when the leisure battery was disconnected the van was fine when it was reconnected all warnings started again all help would be appreciated thanks