So follow the table in the link above or table below: The old lead L1 ark- les, now connects to the ‘a’ terminal on the new switch. The old lead N connects to the ‘b’ terminal on the new switch. The old lead L2 on the Ark-les connects to the ‘e’ lead on the new switch. Go though the table from top to bottom and you should be good to go. If you bought a 3 way switch instead of a four way, you will run out of wires, your switch needs to have 7 connections. It appears the Ark-less is missing t