fitting a double dimmer?

Pete
First of all I am not pleased about the "nasty noise" is this a cheapo unit? are you trying to dim a few lights at once? the dimmer may not be up to it check its' current rating.
the wires will be into the old switch that was always there in a particular pattern mark the ones at the top with a bit of tape, ideally brown, then put them into the A or 1 terminals on either side of the dimmer. The other wires should go into the B termini If you are still in difficulties get a qualified electrician in to sort it out

kennyf
March 2009