If you have already made sure the switches or knobs on the light it's self can't be adjusted for sensitivity then replace the eye or sensor. Some light manufacturers have free replacements so check that option if you have the time to wait otherwise Home Depot and so on carry them.
SOURCE: Dual Brite sensor lighting. Lights will not stay
I really don't understand why these lights are so failure prone and I usually return at least 8 out of 10 back to the store but I've installed a lot of them. If its Zenith brand the light may need to be reset by turning the power off at the switch or breaker for 1-2 min then back on. Then check the motion sensitivity dial if its maxed out turn it back and set it to 75% full also the photo eye may be getting light from the light making it think its daytime at night so try to reaim the photo eye if possible away from the light source that should fix most problems or 20% of them but if you still have problems return it to the store or ask for their advise. Hope this helps I've seen a lot of junk motion lights in my time they are troublesome at times.
SOURCE: Need wiring diagram for installing a photoelectric
I am reasonably sure the black wire connects to the black/hot power wire coming in, and the red continues on to the light. I am positive the white wire is connected to all the other white wires. The white wires usually do not connect anywhere on the device, just wire nutted together in the box
SOURCE: dusk to dawn light flickers on and off
I answer questions for free here at fixya.
I know timers and electrical devices.
If the following information does not help, add a comment and I will work on the problem further.
You posted under the Intermatic ST01C timer.
I assume this is not a new installation, so we know the wiring is correct, and your programming worked correctly in the past.
You have the timer set up for dusk to dawn.
The manual has troubleshoot section.
http://waterheatertimer.org/Intermatic-st01c.pdf
I have read the manual and tested&wired the timer and programmed the timer.
A low battery can cause this kind of problem, even if BATT is not flashing on screen.
The manual also says when encountering a problem, you can reset and then reprogram the timer.
The manuals says to check for loose wires, and defective bulb.
The timer does not work on circuits longer than 100'
The timer does not work if there are underground wires.
The symptoms you describe sound like loose wires or a light bulb.
I would check the wire nuts at the timer and at the outdoor fixture.
Change the outdoor bulbs.
As last resort, reprogram the timer.
These electronic devices go bad, and the ST01C has a 1 year warranty >>> combine the short warranty with the long troubleshooting section, I believe the product fails frequently.
SOURCE: How to set utilitech wall timer for dusk/dawn
The Utilitec 0192773 timer has astro dusk-to-dawn functions.
The manual is very unclear at the exact point you need it to say how to set dusk-to-dawn.
The following page has the manual, with explanation how to find the astro dawn-to-dusk setting
http://waterheatertimer.org/Program-wire-Utilitec-0192773.html
When you are programming the timer, press TIME button and hours start flashing.
Press the +/- button ... the trick is to keep pushing the +/- button until it finally gets to astro, and the sun-moon symbol shows on display.
When the sun-moon symbol shows, the display also shows AM.
Press the +/- again and PM show.
So if you want Program1 to turn lights ON at dusk (PM), then your display needs to show: 1 ON PM sun-moon.
To continue setting astro, do not set hours, just press PROG button.
Then repeat the steps above until: 1 OFF AM sun-moon show on display.
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