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Discussion Starter · #1 ·
Hello.

New to the chatroom and hoping there is help for my issue.

The receiving sensor on my garage door recently crapped out. I watched a few youtube videos and it all looked easy. In the videos there was always 1 wire in each side of the garage door. It was a matter of (1) connecting the white wire to white wire and then (2) connecting the white/black wire to the black wire and then you are done.

BUT, when I took a closer look at the wiring on my door I found something different. The left side where the sending sensor is located had a single wire - no problem. However, on the right side of the door where the receiving sensor is located there are 2 wires coming down from the ceiling. I believe one is from the unit and the other is in some way connected to an exterior electrical outlet on the exterior of the garage. I know this is so by playing with the breakers and using a non-contact testor.

I have attached a picture of the previous wiring. Attached to the black/white wire on the sensor was the black wire from one of the 2 ceiling wires. Attached to the white sensor wire were both of the red wires from the 2 wires coming down from the ceiling. There is an additional black wire from one of the ceiling wires, and from the end of it I can tell it was connected at one point.

My question is where do I connect the stray black wire? Does it belong (1) to the white sensor wire connected to the 2 red wires, (2) to the white/black sensor wire connected to the black wire, or (3) not connected to either?

Any help would be much appreciated.

Thanks
 

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Contact sensors can fool you. If an open wire is running parallel or in close proximity to an energized line voltage wire, the light on the contactor will sometimes come on even though the wire has no apparent connection.

All the garage door openers I have worked on had the receiver and transmitter units connected in parallel. Yours may or may not be that way. Check at the motor unit to see how many 2 cond. cables are connected to the safety sensor screws. If there are no screws with double wires under them, there is a good chance that you need to go ahead and connect that dangling black wire to the other black wire.

I would test first before connecting permanently. Briefly stick the stripped end of that black wire up into the wire nut holding the other black wire and watch for the red light to come on at the sender unit. If it does bring the light on, go ahead and make the connection permanent. If it doesn't come on, don't hold the connection together since it may damage something. Your old sensor may have been good and you may have some other problem, either with the wiring or the control board in the power head.

In that case, a make and model would be needed to get a schematic and see how it should be wired and what might be wrong.
 

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Discussion Starter · #3 ·
Thank you for your response.

In my unit there are no screws with double wires under them. I did as suggested and touched the extra black wire to the wire nut holding the other black wire and the light went on. The permanent connection is now made and the door is working.

I did swap out the sensor but agreed the problem could have been with the wiring. There was some significant corrosion on the red wire and I don't know when the black wire pulled loose.

Again thanks.
 
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