Copy following link to identify timer and download possible manual:
http://waterheatertimer.org/Woods-timers-and-manuals.html#outdoor
Some timers let you select hours of operation once timer turns ON at dusk.
Each timer is slightly different, depending on brand, type, and if timer is digital or mechanical.
If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7
SOURCE: Outdoor lights timer: Intermatic HB851 photo timer
Intermatic make HB51 timer.
If this is not your timer, then add a comment.
To set for ON at dusk, and off 8 hours later, rotate dial to the number 8.
Timer turns on automatically at dusk.
Timer set to 8 hours will start countdown when timer turns ON > and 8 hours later timer will turn off.
Make sure timer is turned away from lights so photo-eye doesn't receive feedback.
Feedback is when the photo eye gets too much light, and then timer thinks it's dawn, so lights turn off, and a moment later photo eye thinks it's dusk again and lights turn on again.
Feedback from lights will cause timer to reset the 8 hour countdown.
A car pulling in the driveway can cause feedback.
If the timer resets because of feedback, it begins the 8 hour countdown again, so the lights will not turn off until dawn.
You can test timer by putting black tape over photo eye, and then timer will turn on.
Set timer for 2 hours for example and then check if timer turned off 2 hours later.
If timer is not functioning correctly, then timer is defective.
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