Posted on 06 Feb 2014
any battery car or leisure will slowly dis-charge naturally over time ,irrespective of whether or not it's connected to any appliances or at least that's my understanding.
personally ,if our caravan isn't going to be used for a while, over winter for example, I always dis-connect the battery at the terminals in the battery box and to reduce the rate of dis-charge I have the battery hooked up to a small solar powered trickle charger, which sits in a prominent position in the window to maximise the amount of day light it gets, upto now this system has worked well for us over the ;last couple of years
as for possible causes Darren, I'm at a loss for suggestions really as ,like you, with the master switch off, I would have expected the 12v circuit to be completely in-active
un-less theres a fault with the switch which is stopping it from shutting off the circuit properly.
