That's uncanny , I've just sent them a question about the internal and external , sorry Apuljack that is, this morning onecal suggested turning off chargers, I'm running close to 1 hour now fridge very cold no ice yet close NO FLASHING LIGHTS I in red Indian talk, "been here many times, "back to you Labby, must be wired to an external source because it's marked up on box and 2 separate fuses, I fitted a charged from car battery driving only charge, at the moment my leisure batteries are dropping,, going to leave this longer then I will put fuse back in internal charger see what happens, Patience, on another note, just been to local boat yard,, they have an EHU coupling into site post as normal,you plug in your lead to that and it also has 2 13 amp plug sockets attached, I've never seen them,