Sure George.
These in-wall timers have extra wire to operate the electronics located inside timer.
You said your old switch has 3 wires.
The new timer can only replace on-off switch that has 2 brass screws and a green screw.
If old switch has 2 brass screws and a dark screw, that is a 3-way switch.
Typically a 3-way switch is found at both ends of hallway.
The Woods 95008 countdown timer is not made to replace 3-way:
http://waterheatertimer.org/Woods-timers-and-manuals.html#59000Here's what to do:
1) Switch has 2 wires (plus bare ground wire). Take switch wires and connect them to
timer-black-wire and
timer-red-wire. Choose either one for now.
2)
In back of electric box are white wires twisted together and covered
with wire nut. Connect timer-white to these wires. This wire will power timer electronics.
3) If electric box does not have white wires described above, then
connect timer-white to bare ground, along with timer-green wire.
4)
Turn on electricity, and push override button located below the OFF button. If lights come on, timer
is wired correctly. If lights do not come on, then reverse timer-red
and timer-black wires.
Add a comment if your need more assistance.
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