Hey All, So moved into a new house, built in the 60's and having a load of fun (NOT) with figuring out the electrics. Have 4 way switching for the garage lights (so three switches) and tried to replace one with a motion sensor switch but not getting any success. LED on the motion switch flashes twice eventually when I flip the breaker back on but then doesn't do anything. At all. If it makes any difference, I'm trying to connect in what looks to be the last switch in the line. I'm fairly new to electrical wiring in the US (originally from the UK) but really thing the wiring is all wrong for these switches. The black hot wires are joined together in each box and the switches are controlling the neutrals (white) and runners (red). Thing is the switches work as they are. Connecting the motion switch and it'll turn the lights on, flash the LED and then turn the lights off but NO switch will bring them back on again. Anyone got any ideas? I've run a ground wire as the instructions said there has to be a ground. Thanks!