I have recently just bought 2 single dimmer switches for my living room. I have tried swapping them with the plastic switches to no avail. I have 2 switches for the single light fitting. When I took the 1st plastic switch off, behind it they were 3 sets of wires. In L1 was a single red, in L2 a blue and either brown/black with red sleeve and in L3 is a yellow with red sleeve and another red wire. the dimmer has 3 connections ~, L1 and L2. I have tried all configurations and lights either don't come on or flicker. The other switch has 3 wires, L1 has the red , L2 has the blue and L3 has the yellow. Does anyone know of the correct way they should be wired, and also is it correct to have 2 dimmers for your only living room light??