Swylite LST100 timer has 4 wires. Red, Blue, Black, White
Timer has more wires than wall switch because timer has electric clock inside. And with + series Swylite timer, it also has led bulb that needs power.Timer can replace ordinary on-off switch
-On-off switch has 2 screws, so 2 wires (plus ground wire) connect to on-off switch
-Three of the four timer wires are used when replacing on-off switch
-Red wire is not used, it is capped off
Timer can replace 3-way switch
-Three way switch has 3 screws, so 3 wires (plus ground wire) connect to 3-way switch
-One of the screws on 3-way switch is colored dark (it is crucial to identify the wire that comes off dark screw so timer can be wired correctly)Lets replace on-off switch see diagram
Timer black goes to Hot wire
Timer blue goes to Load (light, fan, motor)
Timer white goes to Neutral
Timer red is capped off.How to check which wire is Hot, Neutral and Load
Switch you are replacing has 2 wires > one is Hot, the other goes to Load
Remove these two wires. Separate wires so you can test. Turn on power. Tape tester leads to wood sticks so hands are away from power. Test each wire to bare copper wire.
When tester lights up >> that is Hot wire >> please connect this wire to Timer black wire
The other wire goes to Load >> please connect this wire to Timer blue wire.
Now test for Neutral. Test Hot wire to other wires inside box. Neutral should be white. When tester lights up, that is Neutral. Please connect Timer white wire to neutral. IF YOU DO NOT have a neutral, you can connect Timer white to bare ground wire until you have time to drop a Neutral into the box.Replace a 3-way switch see diagram
Three-way switch has 3 wires.
Identify which wire connects to Dark screw on switch >> and then please connect this wire to Timer Black wire.
Timer white wire connects to Neutral
Timer blue and red wires connect to other two wires that came off switch ... they connect to either one.