Double dimmer replace double switch for 2 lights in lounge

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Hi. I hope someone can help :confused: . I bought a double dimmer to replace double switch for 2 lights in my living room. When I switched off the electric unscrewed the double switch, there were three red wires inside, and for each switch there was L1, L2 and L3. For the dimmer there are corresponding 2 lots of L!, L2 and ~with a line through it. The wires were attached as follows:
1. to 1 L1, then across to other L1.
2. To 1 L3.
3. To the other L3.

I fitted the dimmer the same, but with a narrower gauge connecting wire between the L1s (the original wouldn't reach across) and the ~with line corresponding to L3.
One light would dim, but the other one would only go on/off. Is this just coz the connecting wire is narrower gauge?? Or would it be something else??
 
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Sounds like a faulty dimmer switch. For the one that doesn't dim - have you tried it in L2?

When you take it back fora replacement, buy some cable of the correct size - you shouldn't use smaller stuff just because that's all you've got.
 
Thanks for your advice - hopefully get it sorted when I have a chance to return it -I'll let you know...
 

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