Electrical – Light switch doesn’t turn off lights

electricalswitchwiring

I just recently installed a light switch. It's not a dimmer switch, so there's just an off and on. Now, the lights are constantly on! When I turn the light switch off, they dim slightly, and when I turn the light switch on, they brighten slightly. How might I have messed up installing the light switch that this happens? Could it be the switches fault?

Process I used to install light switch:

  1. Remove old light switch. Wires going into old light switch are: bare copper wire attached to green lead, 2 black wires going into copper leads red wire going into black lead.
  2. Connect new light switch. New setup is: bare copper wire attached to green wire labeled "ground" on switch, 1 black wire attached to black wire labeled "in" on switch, 1 black wire attached to red wire labeled "out" on switch, 1 red wire attached to white wire labeled "neutral" on switch.

Best Answer

STOP!!!!

You have messed things up. Sorry to be blunt. But electricity is dangerous, so this is really a big deal.

Safety First

Turn off the breaker for this circuit. NOW! What you have described might be fairly benign, but you might have caused some parts of your electrical system to be "hot" that should not be.

Assuming you are in the US (if you are not, please say where you are as different countries have different color codes):

  • Neutral is white or gray and only needed on a switch if it has "smarts" of some sort (timer, dimmer, WiFi controls, etc.)
  • All other colors (except green/bare == ground, which you have handled correctly) are HOT or SWITCHED HOT.

Your new switch has a neutral connection? That implies it is something more than "just a switch". Not a dimmer (since you said so), but is it a "smart switch"? A timer? Something else special? In any case, the red wire is not neutral and should not be connected to neutral on the switch. If you actually need neutral then you need to find neutral - typically a bundle of white wires stuffed in the back of the box, but sometimes not in the switch box at all because old construction did not require neutral in the box.

Old switch: "2 black wires going into copper leads" - what does that mean? Was it two black wires connected together onto one wire or screw? If so, they likely need to be connected together to the "in" connection on the new switch. If they were two separate connections on the old switch then this is impossible to guess, but a 3 way switch is a possibility.

Pictures

A picture is worth a thousand words. Please upload pictures of the old switch (preferably showing model # if you can), the new switch (again showing model # if you can), and the switch box showing all wires as clearly as you can.

Related Topic