IT SOUNDS TO ME THAT THE BOTTOM SWITCH IS THE PROBLEM. I THINK EITHER THE RED IN L1 OR THE RED IN L2 SHOULD BE THE COMMON. I SUSPECT ONE OF THESE IS THE LIVE SUPPLY IN OR THE LIVE SUPPLY OUT TO THE LAMP. THE TWO CORES THAT ARE IN THE SAME CABLE, I/E ONE BLACK AND A RED SHOULD BE THE TWO CORES OF...