how do i fix my elecrics on a monza caravan ?

we took van out on a fault finding night, plug it in and few hours later total darkness when leisure battery ran out, the lead is ok as i checked that. could it be just fuses there was no light on to master box but earth test was ok i think anyone shed some light on this, where is the fuses for this van , could it be the connection to the van,,

john w
March 2009