A friend of mine has got a problem (Posted below) with which I have no idea how to help him. Any ideas? "just to remind you what happened, I connected the Leisure battery the wrong way round and blew the 30A fuse. The result being that I have lost the "Link" between the two batteries. e.g. when on mains I can only charge the leisure battery (not the engine battery)...... and when I run the engine I can only charge the engine battery (not the leisure battery) So both the Calira and Engine chargers are working, the only problem is I have lost the "Link". The problem being that if I stay for several days on a sites without 240V (e.g. at a show) the battery will run down, ok this is normal, but when I drive for a couple of hours up the road to another site the engine should charge the leisure battery but I now can't because I have lost or burnt out the "Link" "