Following link has a close-up photo of on-off pins on GE 15075 timer
http://waterheatertimer.org/GE-timers-and-manuals.html#15075Pins are located around timer dial
The pins divide 24-hour day into 1/2 hour segments
Pins are out for ON
Pins are inward for OFF
Notice that numbered dial is divided into dark and light areas ... the dark areas are PM, light areas AM.
For example you are connecting chicken coop lamp to this timer.
Turn lamp on and make sure bulb is working.
Plug lamp into timer.
Set pins in and out as follows: all pins outward between 4:30 pm on light part of dial to 8:00 pm on dark part of dial. And then set all pins outward between 5:00am on dark part of dial to 7:00 am on light part of dial.
Plug timer into outlet
Move switch located on top to TIMER ON
Manually rotate timer dial clockwise to see lamp turn on and off.
Lastly, set current time: Manually rotate timer dial clockwise until current time lines up with arrowhead located on inner dial. So if current time is high noon, then rotate dial until 'sun' symbol located on light part of dial lines up with arrowhead.
As time passes, the timer dial rotates, and the pins click circuit on-off.
To override timer, move switch to outlet-on.
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