Hi please can you help i have 1 double light switch each switch has 1 red live wire at the top and 1 black wire at the bottom ,one wall light wall fixing has 2 reds screwed together two earths put toghether but two blacks just loose the other fitting has 3 reds together 3 earths together and 3 blacks loose , the person who took it the orignal fitting off thought the blacks were all together ,but when it was connected this way the lights stayed on then blew the fuse when the switch was switched off ?? the rest of the lights in the house work when the blacks are seperate so im thinking the person who took the original fitting made a mistake thinking the blacks were toogether how do i find the right wire to connect ive some wiring experiance and have a meter