How do I set a Woods indoor light timer model# 16ULD/3AO? I can't figure it out!! Kathy

http://waterheatertimer.org/How-to-set-timers.html
http://waterheatertimer.org/Woods-timers-and-manuals.html#16ULD

Links above has instructions for setting analog timers, and comparison of features for various analog timers
Gene

Water Heater Timers Save Money

If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

http://waterheatertimer.org/Woods-timers-and-manuals.html#16ULD

http://waterheatertimer.org/How-to-set-timers.html

Links above have the timer and the step-by-step instructions.

Gene
Water Heater Timers Save Money

If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

http://waterheatertimer.org/How-to-set-timers.html

http://waterheatertimer.org/Woods-timers-and-manuals.html#outdoor

I think that's an analog dial-type timer.
Attach photo

Gene

If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

http://waterheatertimer.org/How-to-set-timers.html

Analog timer
Gene

If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

Copy following link to identify timer, and see instruction manuals for each type:
http://waterheatertimer.org/Woods-timers-and-manuals.html#outdoor

Gene
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If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

1) Woods 16uld appears to be 24-HOUR analog timer
http://waterheatertimer.org/How-to-set-timers.html
http://waterheatertimer.org/Woods-timers-and-manuals.html#16ULD

2) ADD comment and describe timer in detail for more assistance.

If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

1) Timer not identified.
Copy following link to identify same-similar timer:
http://waterheatertimer.org/Woods-timers-and-manuals.html#outdoor

2) Add comment and include photo of timer, or describe timer in detail.

If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

I am unable to identify the 16uld timer.

Amazon has a page of their timers. I am familiar with all of these.
http://picclick.com/Amazon/Home-Improvement/Electrical/Timers/

Woods timers and manuals show on following link
http://waterheatertimer.org/Woods-timers-and-manuals.html

If you can visually identify the 16ULD timer, then add a comment and I can answer your question.

That being said, any timer can operate Christmas lights.
If your timer has photoelectric eye, then it has to be placed outside where it can respond to dusk and dawn changes in light.

But there are some Woods timers that have photoelectric eye, and that feature can be overridden.
Again it depends on the timer, and clear identification would help numerous folk who are asking fixya about your same timer.

I have not heard of Woods 16ULD.
Woods timers sometimes have more than 1 model number for same timer, depending on who packaged and sold timer.

You posted under Woods plug-in timer with segments around edge of dial.
If this is not your timer, add a comment.

Also see lost of Woods timers where you might recognized photo of your model:
http://waterheatertimer.org/Woods-timers-and-manuals.html

To program Woods timers with segments:
Rotate dial until current time lines up with arrowhead located on inner dial
Segments around outer edge of dial lift up.
Use fingernail, or small screwdriver to lift up segments when you want timer to turn OFF.
Leave segments down for times you want timer ON.
Slide switch located on top of timer is manual override.
Move switch to ON position when you want lights ON full time.
Move switch other direction for timer program to operate.
Timer dial rotates with passing time.
Program repeats each 24 hours.
Table lamp must be turned ON for timer to function.
If timer doesn't work, check receptacle for power, check that lamp is turned ON, and check that bulb is good.