I have a 2 gang 2 way light switch downstairs for the hallway light and landing light with 6 terminals 2X com 2X L1 and 2x L2, with 5 wires, red/yellow and blue from one core and red and black from the other.
Upstairs again i've got the same cores but this is just a 1 gang 2 way switch for the landing light.
down stairs: R to Com, & Blk L1 of one sw. ignore L2.
R of 3C to L1 of other half of sw. Blu to L2, Yell. to C.
upstairs: Yell to C, 2 X R to L1, Blk + Blu to L2 .
this should be shown in forum projects 'wiring lights'
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