Changing old 2 button plastic to brass switch

[livewire99]

Just decided to fit a new brass 2 switch light switch like for like with very old plastic one
Swapped cables like for like but only one light now comes on

Cable feeding has 3 cores
black red earth

other cable coming in has 4
red
yellow
blue
earth

I stress i have put them into same place they came out on new brass switch
Any ideas?
Do i need to interlink the black (which feeds common on one side of new switch)

 

[livewire99]

must add 4 cables form both incommers
red
red
blue
yellow

go to bottom of new swith

black goes to common on top of one side of switch

 

[GaryMo]

Name the terminals that the old conductors terminated to on each switch.
There will be markings against the terminals, eg C or COM, L1 and maybe L2.

Also, make sure you earth the brass face plate.

 

[livewire99]

red went to L1 yellow to L2 and black to common on one side of old switch

opposite side

red went to L1 blue to L2 on old switch no common

The new switch seems to have these side by side instead of upside down (compared to each other) on old switch

 

[GaryMo]

There must have been a conductor in the common terminal of switch two otherwise it wouldn't have worked.

Was there not a small link between the common terminal of switch one and the common terminal of switch 2?

Is switch one working correctly and switch two not working at all?

Are both switches part of two way circuits?

The fact that the terminals are in a different orientation on the new versus old switch doesn't mean anything. Different manufacturers have different outlays.

 

[livewire99]

there was non link on old one i tried linking new one no effect

might try again as that seems logical

would the old one be linked internally

 

[GaryMo]

No, the common terminals won't be internally linked.

 

[livewire99]

well its dark now will put off till monday

thanks

 

[ban-all-sheds]

Make sure you've correctly identified the groupings of COM/L1/L2 for each half of the switch - different makers arrange them in different ways, but there will be something on the back to tell you which COM goes with which L1/L2.

See the two gang light switch article in the Wiki.