I"m installing a Cooper Devices

A single pole switch/dimmer will have two black terminal wires. Power in on one and switch leg out on the other.

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The Cooper 7729w is a three pole single throw switch with a common (connected) hot wire that supplies it. What you had before was two separate single pole single throw switches and one single pole double throw switch that is used as a three way. The short answer is NO that replacement will not work UNLESS you don't want the other switch on the other side of the room to work.


Personally, I think that if you really need to ask this question you need to seek the advice of a professional electrician.

Copy following link for specific wiring diagrams for combo switches:
http://waterheatertimer.org/How-to-wire-switches.html#combo2
Combo switches require Neutral wire in the box.
Neutral wires are usually the white wires twisted together, covered with wire nut, and pushed to back of box.

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Which combo device do you have??
Include model number so expert can look at the specific manual.

Is this a switch-outlet combo with indicator LED?
Or is this a switch-pilot-light combo that controls separate outlet.

What does the switch control?
What device did you replace?
Did you replace a single-pole switch, or a 3-way switch, or an outlet??
Add a comment including as much detail as possible.

Copy following link for specific wiring diagrams
http://waterheatertimer.org/How-to-wire-switches.html#combo

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

The Cooper combo device requires neutral wire to energize the outlet.
To control outlet with switch, the Hot side of device must have break-away fin.
Remove break-away fin.
Connect jumper wire from switch load side to outlet Hot side.
Open following link for instructions with illustration:
http://waterheatertimer.org/How-to-wire-Cooper-277-pilot-light-switch.html#combo

Add a comment for more help.

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This extra wires where taps for the non working components you mentioned.

I have 120Volt cooper 277 pilot light switch here in my office.
Dang instruction sheet shows wiring for all kinds of cooper devices.
EXCEPT pilot light switch.

So I tested with multimeter and came up with following:
Key to any wiring device is color of screws.
Hot from breaker box always goes to dark-colored screws.
Neutral always goes to silver-colored screws.
Brass screws are for Hot wires from breaker or Hot going to Load
Green screw - ground

People frequently write fixya report that lighted device doesn't light up.
And they report device is wired correctly.
Or they report one device lights up and the other doesn't.
If two devices don't work, I suggest they swap devices to see if same problem happens in other location. No fixya customer has added comment to reveal result of swapping device.

After searching Leviton, Lutron and Cooper websites, there is no conclusive answer.
Manuals show lighted devices, and show ordinary one-for-one replacement wiring ... there is no secret technique for getting device to light, just attach wires like ordinary switch.

Check that ground wire is connected.
Install device in another switch location and see if it works there, which would indicate possible electrical ground fault at first location.
The wrong device was put inside the sales box.
The device is defective.

recheck the wiring in receptacle loose wire --broken wire / connection or improper wiring

You must verify that you in fact are dealing with a Neutral wire and a Hot wire to power this device correctly. If this was an existing single pole switch it is likely that the white wire was used as a switch leg to a light fixture .