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My intermatic timer is only turning on one light instead of all

It's supposed to control yard light, porch light and garage lights. Only the yard light turns on.

Posted by Chris Devoe on


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Broken wire ... bad connection ... call an electrician if you can't find it.

Posted on Oct 14, 2021


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Just bought my house and the porch light is controlled by Intermatic timer. Just noticed today that my porch is light is on constant. Replaced the battery in the timer. I was able to set the time and...

Don't forget to reset timer after replacing battery:
Copy following link to identify timer and download manual:

If timer does not function after reset, then buy new timer
EJ500 is rated incandescent bulbs only


If you need further help, I’m available over the phone at


I want to replace my existing single bulb porch light with a 2 bulb motion activated light. It would be operated with the existing switch. Is this ok to do?

Yes. Must keep switch turned ON.
Outdoor lights will only come on when motion is detected, otherwise light bulb does not come on. So the indoor wall switch does not work as override since the motion sensor takes over as the sole switch.
Copy following link for wiring illustrations:
Other solutions include adding separate motion sensor light nearby and keep porch light so you can turn on-off when desired.
Another option is to add photocell to outdoor light so it turns on automatically at dusk.
Another option is to use outdoor yard timer with dawn-dusk capability:
Another option is to replace indoor wall switch with with dawn-dusk timer, that can also be used as ordinary on-off switch so you can turn porch light on-off when desired. Timer such as Intermatic ST01C offers simple 2-wire connection.:

If you need further help, I’m available over the phone at


I have porch lights that are controlled by a switch in front entryway and also from garage. (3-way) I want to put a timer in entryway and by-pass the garage so lights come on from only one location.

Identify which of 2 switches has the Hot or Power wire.
Hot wire will be connected to dark screw on one of the switches.

If Hot wire is in garage box, then follow this Step 1-2-3 diagram for ST01C timer:

If Hot or power wire is in entryway box, then you have a '3-way no neutral,' so cap off 3 wires going to other switch. ..
And then wire ST01C timer as single pole no neutral.

If you need further help, I’m available over the phone at


Self adjusting in wall timer

Timer is not known.
Copy following links to identify timer and download manual
In the manual, you will see directions for resetting timer.

If resetting does not work, then review timer programming carefully to make sure there are no conflicts in the programming such as overlapping days, or inconsistent am-pm, etc

If you need further help, I’m available over the phone at


Programable light switch

Switch is not identified.
Switch might be bad. Replace the switch.
Copy following link to see switch wiring diagrams:

If you have a timer, such as EJ351, then timer can go bad even when light is working correctly.
Copy following link to help identify timer and download manual:

If you need further help, I’m available over the phone at


I have a TORK 920L timer for our church parking lights. The timer is supposed to be a 7 day timer according to the dial. Right now it is turning one revolution per 36 hours. How do I get it to turn in an...

1) It sounds like the clock motor is not operating correctly.

2) This timer is not supposed to be connected directly to the lighting circuit, and should control contactors instead.
See what contactors look like

3) I cannot find replacement clock motor for that timer.

4) Tork 920L mechanical dawn-dusk timer seems to sell for $1200

5) Contact NSI Tork directly to find sellers:

6) Intermatic shows 1:1 replacement for tork brand timer is Intermatic T51211BC
Electric wholesale on-line showsT515211BC timer for $1000.

7) Contact Intermatic directly for more information, for example their second generation astronomic electronic time clocks can perform the same functions.

Intermatic electronic Astronomic dawn-dusk ET8015C sells at 1000Bulbs for $179

8) Add a comment and explain what kind of electrical load you have, for example a small church with simple 120V lighting can use inexpensive timer like T101 that sells for $60 at Amazon. Timer trippers would need to be reset.

Add a comment for more free help.
Also take advantage of fixya phone service.
For a price, expert speaks with you over phone while you work on timer or any do-it-yourself project.
Fixya is always less expensive than a service call.


I have a intermatic ej351 in my garage to turn the outside coach lights on and off. I made the mistake of putting some 10 year bulbs in the coach lights and now the red light on the timer just flashes...

I answer questions for free.
I specialize in timers and electrical devices

Below is the manual for the EJ351
The red light is a good indicator of the EJ351 timer.
The manuals says that you can clear all programming by moving control lever to OFF-CLEAR position for 20 seconds.
After programs are cleared, the red light will turn off.
Then move control lever to ON position, and then red indicator light will start flashing.
So the problem may be that the timer programs were accidentally cleared.
Use the instruction manual to re-program your timer.
Add a comment if you need more assistance, and I will help.

Good Aftenoon, I have a intermatic 101. My

It's a common mistake. The timer is mis-wired. Both neutral (white) wires are connected to terminal "A". The incoming HOT wire from the breaker (or source) _must_ be connected to terminal #1. The outgoing LOAD wire (to the yard light) _must_ be connected to terminal #2. Check your connections and you will see that the 2 black wires need to be swapped.
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