I have has a Battery Master fitted to my IH Tio RL ( Ducato ), to utilise the solar panel charge for the leisure battery to top up the main van battery now that we need to store the van away from home base. I am believe that, as part of the original van configuration, when the van is running, there is an excess flow the other way - from the main battery to top up the leisure battery. I now seem to get an intermittent audio 'ping pong' from the control panel when driving.... the whole panel lights up for a few seconds ..... but no specific warning is given, eg tanks empty etc. Any ideas anyone ? - Thanks