1) Utilitec timers cannot be used for multiple switch replacement.
They replace only single-pole switch.
2) Open following link to see specific timers that can be used for 3-way.
http://waterheatertimer.org/GE-timers-and-manuals.html#150713) In your case you have 3 different switches that control outside lights: so you have two 3-way switches and one 4-way switch.
Open following link to see typical 4-way wiring.
http://waterheatertimer.org/images/Typical-3-Way-switches-450.jpg4) 3-way timer will replace one of the 3-way, but not the 4-way.
The timer can be used in place of the 4-way switch.
Identify 4-way because it has 4 screws and 4 wires (excluding ground wire)
5) Keep in mind that 3-way timers replace one of the 3-way switches.
But wiring has to be changed at the remaining 3-way switch.
Open following link to read why wiring is changed at remaining 3-way:
http://waterheatertimer.org/ST01C-program.html#3wayWiring at the 4-way switch is left the same.
When you buy the timer, read manual carefully for correct wiring, or add a comment to this thread, and I will help more.
Add a comment for more free help.
Also take advantage of fixya expert assistance live.
For a price, expert works with you while you work on timer or any do-it-yourself project.
Fixya is always less expensive than a service call.
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