Check back of timer for correct clock voltage.
FM1 timer clock can be 24V, 120V or 240V.
Terminals 1 and 2 power the clock motor.
Terminals 3 4 5 are dry.
3 4 5 have no power after you connect 120Volt Hot and Neutral to terminals 1 and 2.
120V Hot is black wire, and typically this is connected to terminal 1.
120V Neutral is white wire, and typically this is connected to terminal 2.
To wire light to terminals 3 4 5:
120V Hot is connected to terminal 3. So Hot connects to both terminal 1 and 3.
Terminal 4 is NO normally open, so connect Black wire going to outdoor lights to terminal 4.
Terminal 5 is NC normally closed, and no wire is connected here for this application.
White wire to outdoor lights is connected to Neutral, so white wire to lights connects to terminal 2. So both neutrals connect to terminal 2.
http://waterheatertimer.org/images/FM1-wiring-280.jpghttp://waterheatertimer.org/Intermatic-trippers-and-parts.html#FM1http://waterheatertimer.org/How-to-set-timers.html
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