How to Master-Slave wire two motion sensor light fixtures

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Old 08-13-16, 10:17 PM
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How to Master-Slave wire two motion sensor light fixtures

I am replacing the 2 light fixtures on either side of my entry door w/2 motion sensor models - I'd like them to go on at the same time. I'm told this is called "master slave" wiring & my 1st attempt was incorrect since one of the fixtures isn't lighting up at all.
What I did was simply wire up each of the new fixtures just like the old fixtures ie white to white, black to black & ground to ground. That's it. One works & one doesn't.
I know the new fixtures each have a "red" wire which I didn't use, since I'm not sure how to use it.
Any help would be appreciated.
Thanks in advance.
Jim
 
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Old 08-13-16, 10:30 PM
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In order for the two motion sensors to both control both lights.... you need a three wire cable between the lights. The three wire cable has an additional red wire in it that ties the two motions together.

You may have to use one fixture/motion combo to run both lights. The second motion detector would not be connected. This setup depends on your existing wiring.

What do you have now ?
A single cable at each light ?
A single cable at one and two cables at the second one ?
 
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Old 08-13-16, 10:45 PM
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Hello PJmax - thanks for your quick response. I'll chk. tomrw. & post a reply.
 
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Old 08-13-16, 10:52 PM
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BTW, only one motion would be fine - everyone enters the house from the same direction, from the driveway, up the sidewalk to the front door.
There is an unused red wire in each new motion light.
More tomorrow re the number of cables at each light....
Thanks again!
Jim
 
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Old 08-14-16, 10:48 AM
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In diagram A..... the power goes from the switch to light 2 and then light 1. You could put the motion sensor at the light 2 location. It would control both lights.

In diagram B.... there isn't a direct tie between the lights.... both motion sensors would need to be used.

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Old 08-14-16, 12:03 PM
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Thanks PJ. I'm a little stumped. I have one side working perfectly, black to black, white to white & copper to copper.I tie them into the box which has 2 blacks, 2 whites & 2 coppers.
But I can't get the other side to work. When I do the same thing on the other side the light doesn't light.
AARGH!
I'll try to attach a few photos.
Here's the left side - works perfectly.
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HERE'S INSIDE THE BOX OF THE WORKING FIXTURE:
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HERE ARE THE WIRES TO THE 2ND FIXTURE
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I FIND IT VERY DIFFICULT TO UNDERSTAND THE DIAGRAM.
What do I do with the red wire on each light fixture? That must be the key somehow.
It's stil black to 2 blacks, white to 2 whites, & copper to copper?

Thank you.
JIm
 
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Old 08-14-16, 02:08 PM
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Are there any connections at the back of the light ?
Can the light be wired without the motion sensor ?

We don't want the motion sensor to be connected at the single cable side.

You will need to open the two black wires up at the two cable end. You will need to determine which black wire is the hot wire. The hot wire goes to the black of the fixture.
The other black goes to the other light and connects to the red wire.

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The two black wires here are connected together. One is the 120v hot and the other goes to the other light.
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Old 08-14-16, 02:34 PM
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Thanks PJ. I'm gonna go try that - wish me luck!
 
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Old 08-14-16, 03:18 PM
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PJ, We'll, here's where I am. On the first fixture, the one I've always been able to get working with the motion sensor, I attached the red wire to the hot black wire (I have a circuit tester) & it continues to work well.
Now, the other fixture, I have 2 black wires from the box remaining that I need to do something with. When I hit them with the tester they both beep, but, just a little, not constantly like the hot black wire on the other fixture. Is that okay? Where do I place these 2 black wires? I guess one will be attached to the black wire of the fixture & the other one, perhaps to the red wire of this fixture? Are they interchangeable?
So sorry for the hell I'm putting you through....
JIm
 
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Old 08-14-16, 03:22 PM
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Correction! I found the hot black wire in the incomplete fixture _ I guess when I tested it before the other fixture, which is on motion sensor mode, must have been off.
So we're almost done, I think. The hot black goes where? And the other black goes where? And we're done.
Ty.
Jim
 
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Old 08-14-16, 03:27 PM
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A non contact pen tells you if you have high voltage in the area..... you do.
It's next to useless for actual measuring or testing.

Ok.... do this. On the side with only one cable. Connect that fixture only white to white and red fixture to black. Cap off the fixture black wire. This disables that motion sensor.

You MUST determine which wire is hot where the two cable are.

Try this.... connect the white fixture wire to the two white wires.
Touch the red fixture wire to one black or the other. The one that makes the fixture light is hot and goes to the black on the fixture. The other black wire goes to the red fixture wire.
 
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Old 08-14-16, 04:36 PM
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PJ,
Good news - the fixture that is on the side that never went on & off via motion sensor is now working - yipee!
Bad news - the other fixture is on all the time - thoughts? This is the side with the black fixture wire is capped off..
Thoughts?
Running out of the light - I'm in PA....
 
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Old 08-14-16, 04:50 PM
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Well, the right side is working perfectly, going on & off as it should. The left side is on all the time.
Here is a photo of the left fixture o f note:
-3 whites together
-black from fixture capped off
-red from fiture is attached to two blacks from inside the house
Thoughts?
Thank you.
Jim
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Old 08-14-16, 07:09 PM
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Sir.... you are not fully reading what I posted for you. I don't know which side is which.
You can't pick the side where the motion sensor works..... it MUST be utilized at the two cable location.

Ok.... do this. On the side with only one cable. Connect that fixture only white to white and red fixture to black. Cap off the fixture black wire. This disables that motion sensor.

You MUST determine which wire is hot where the two cable are.

Try this.... connect the white fixture wire to the two white wires.
Touch the red fixture wire to one black or the other. The one that makes the fixture light is hot and goes to the black on the fixture. The other black wire goes to the red fixture wire.


So on the side with two cables.....
All three white wires get connected together.
The HOT black wire goes to the black wire of the fixture.
The NOT HOT black wire goes to the red wire of the fixture.
 
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Old 08-14-16, 07:59 PM
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Thanks PJ. Got rained out & dark fell but I'll finish up after work some day this week.
Thanks so very much for all your time & effort. I really appreciate it.
Regards,
Jim
 
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Old 08-14-16, 08:01 PM
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My pleasure... let me know how you make out when done.
 
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