Fitting a double dimmer switch

[Jimbob950]

My suggestion is - whichever switch is the one you no longer need, or doesn't do anything, remove that feed to the lamp from the old switch and insulate the end of the wire with a Wago or similar, That's not to be used any more.
Then for your two dimmer switches, connect the live feed presently linking the switches to L1 on each dimmer.
Then connect the dimmer tilda ~ terminals to the remaining two lamp feeds.

Sort of like this (not my art!) - blue and yel representing the two lamp feeds, stating the obvious!
View attachment 92666

 

[Avo Mk8]

Did you mean to post a message Jimbob950?

 

[Jimbob950]

Hello, Thanks for your suggestion.

Did you mean to post a message Jimbob950?

Sorry, Had an urgent call from a neighbour. I have wired the switch a different way from your o. Something is wrong as only one light is working.

Did you mean to post a message Jimbob950?

 

[Jimbob950]

Hello, Thanks for your suggestion.

Sorry, Had an urgent call from a neighbour. I have wired the switch a different way from your o. Something is wrong as only one light is working.

I will use your method an see if that works.
Thanks for your assistance.
method I used is as shown.
Not as neat as yours but your comments would be welcome

 

[Avo Mk8]

You've drawn 'COM' on the diagram. Is that what is actually marked on the dimmers?

Do you have a leaflet with the dimmer showing how it is to be wired?

I think putting the power into the dimmer 'output' is wrong!

Finally, can you swap the blacks over and see if the behavior of the lights swaps correspondingly?

 

[Jimbob950]

You've drawn 'COM' on the diagram. Is that what is actually marked on the dimmers?

Do you have a leaflet with the dimmer showing how it is to be wired?

 

[Jimbob950]

Hello, It's marked C on the dimmer leaflet.

 

[westward10]

Have you definitely connected the correct two wires.

 

[Avo Mk8]

Hello, It's marked C on the dimmer leaflet.

Does the leaflet show the bulb connects to C, or the line mains power connects to C?

 

[Jimbob950]

Does the leaflet show the bulb connects to C, or the line mains power connects to C?

C goes bulb

Does the leaflet show the bulb connects to C, or the line mains power connects to C?

 

[Avo Mk8]

OK. Thanks.
Doesn't seem to matter which way round your dimmer is connected.
Both ways are shown as valid. Sorry - red herring.

So to find out what's going on with your non-working dimmer, can you try putting the working light on it, just to check if it's the dimmer, or the circuit?

 

[westward10]

I think you need to verify you have the correct two wires. Mark the supply wire so you don't mix it up and connect all three wires together, if both lights work you have the correct wires.

 

[Jimbob950]

I think you need to verify you have the correct two wires. Mark the supply wire so you don't mix it up and connect all three wires together, if both lights work you have the correct wires.

 

[Jimbob950]

I think you need to verify you have the correct two wires. Mark the supply wire so you don't mix it up and connect all three wires together, if both lights work you have the correct wires.