I am trying to replace a regular light switch with a new motion sensor light switch.  I can’t seem to understand how the wiring works or even if the new motion sensor wiring is compatible with my existing wiring.  I was wondering if you could take a look at the pictures I have attached and see if you could tell me which wires go where.

This is the new motion sensor light switch that I purchased. My current connections:	This is the wiring for the new motion sensor switch.
Switch Connection #1	Switch Connection #2

You have purchased a motion sensor light switch which is designed to operate on a switch that controls one light. Switch Connection #2 photo fits the new motion sensor light switch, because the wiring in Switch Connection #1 suggest that there are more than one switch controlling one light.

 

On your new switch you have a red, black and green wire. You will only use two wires to connect your new switch, the red and black wire. You don’t need the green wire, so I suggest you tape and bury the green wire. Your photo suggests that your home is already grounded, because your previous switch did not use the green wire. Therefore the green wire is not needed for this connection. Caution: Before you touch any wires in your home, find the circuit that you are working on and turn off the power in your main panel. (Electrically safely is very important.) In Switch Connection #2, attach the red wire to any one of the black wires, and then connect the new black wire to your other black wire. Turn your power back on and test you new switch. Follow manufacturers instruction for testing.