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Hi. I have opened the wall Switch cover and I have only 3 red wires and 1 earth. 2 of them in L1 and 1 in L2 none in L3 My Dimmer has 1 x L1 1 x L2 and the curly X terminal. Which Red wires do I put in where.? Just the same as the normal Switch cos I thought that I'd need to have at least one...