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i have wired a 2 way gang 2 way switch and having major problems. it is old wiring. downstairs has 3 cables. cable one red, black, cable 2 red, black, cable 3 red, black. The back plate is L1,L2,L3 AND L1,L2,L3. UP STARIRS has 4 cables. cable one red only, cable 2 red, black, cable 3 red...