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It's the wiring into the switch itself. I have 2 reds, 1 black and 1 yellow and 1 blue? Any idea which goes with which? Thanks again, Paul.

Hi All, Need some help, Upstairs hall light needed replacing, however, since I change it doesn't work correctly - this is dependent on whether the light switch downstairs is switched on or not. I have 2 reds, 1 yellow, 1 blue and 1 black..Currently the the yellow is at the top and blue...