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Need some help please with matching the wires from the current 2 gang wall switch to a new dimmer. Current wall switch has: [code:1] ______________ | | | L1 L3 L2 | | | | L3 L2 L1 | |______________|[/code:1] Cable 1: black to top L1, red...

I have what seems to be a common problem in this forum. I am installing a new ceiling rose and am stuck with 3 black and 3 red wires coming from the ceiling, not knowing which of the blacks is the switch wire. I have bought a cheap electrical probe for £8 from B&Q which I hope to use to...