GE 15313 In-Wall Digital Timer. The light is partially on when it should be off and when it should be on, it is fully on. Is this normal or do I need a new switch?

The old Intermatic SS5 has not been made for a while....
There is no programmable timer that also dims,
There are Intermatic battery-operated timers that do not require neutral,
http://waterheatertimer.org/Programmable.html#st01

and Defiant / GE incandescent-only timers do not need neutral.. but do not have dimmer
http://waterheatertimer.org/Programmable.html#15313

However, some of the wifi and zwave devices offer both timed and dimming capabilities... but they require Neutral wire.

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

http://waterheatertimer.org/GE-timers-and-manuals.html#15313

Follow steps in manual?
Be careful, this timer is not rated for heavy-duty.
No neutral wire needed.

Gene

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

Try reset and reprogram
If functionality is not restored, then replace timer.
Note also the load rating for each timer.
If you are operating above or outside the load parameters for timer, then timer might not function correctly or function as long as expected.
This timer, and most timers have 1 year warranty.
http://waterheatertimer.org/GE-timers-and-manuals.html#15313

Suggest replacing with 5-year warranty Ei600
Can operate any load value, LED fluorescent incandescent motor
Has dawn-dusk or programmable mode
http://waterheatertimer.org/Programmable.html#st01

Gene

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

Wired wrong
http://waterheatertimer.org/How-to-wire-timers.html
http://waterheatertimer.org/How-to-wire-GE-15312-timer.html

Gene

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

There are 2 different timers: 15313 and 15312
15313 has Black Blue and Green wires
15312 has Black Red White and Green wires

1) Your Switch has 3 wires: sounds like a 3-way switch at each end of hallway.
The 15313 timer cannot be used to replace 3-way switch
http://waterheatertimer.org/GE-timers-and-manuals.html#15312

2) Buy GE 15312 timer for 3-way switching.
http://waterheatertimer.org/How-to-wire-GE-15312-timer.html#3-way

3) GE 15313 is for single-pole only, and rated for incandescent lights only and will not work for CFL, LED bulbs, or other inductive loads.

4) GE 15313 timer will work for single-pole or 3-way, and work with any type of bulb, or load up to 100 feet away.

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

It sounds like you are replacing 3-way switch.
Low voltage light? Are these lights connected to 120Volt circuit?

I think you want the GE 15312 timer, instead of GE 15313.
http://waterheatertimer.org/How-to-wire-GE-15312-timer.html

GE 15313 is for single-pole incandescent light bulbs only.

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

Black to black (hot), Green to green (ground) and the only one left is of course white to blue. The (neutral) white wire can be many different flavors (blue, red, orange, brown, etc.).

If the outlet your plugging into (or controlled by the service panel breaker) is 15 Amps use a minimum of 14 gage wire (or 12 gage is even better), if its a 20 Amp outlet use 12 gage wires (or 10 gage). Don't use a 16 or 18 gage wire because it may get hot and start a fire because its undersize for the Amps.

You are install GE 15313 timer
Open following link to identify timer
http://waterheatertimer.org/GE-timers-and-manuals.html#15312

15313 timer does not require Neutral wire.
The timer you are replacing has neutral wire (White wire)
So replace timer wires 1:1 except do not connect timer to white neutrals.

Keep in mind the 15313 is for incandescent lights only and is not for CFL or LED lights.
If you want timer for CFL, then install one of the other timers shown on page.

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

Timer wiring instructions shown on following page:
http://waterheatertimer.org/GE-timers-and-manuals.html#15071

You connected the white wire and red wire together, and that is why lights are clicking on-off.
I test timers and have done this intentionally during testing.
Follow instructions shown on link above, and GE timer will work correctly.
Same wiring applies to Tork, Swilight, Utilitec, Woods, Leviton, Intermatic non-battery operated timers.
Instructions are different for Aube, Brinks, UPM and Intermatic battery operated

http://www.manualsdir.com/manuals/400481/ge-in-wall-15086-ge-smart-digital-timer.html