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Installing a Dimmer Switch for a Light Fixture

I am replacing a dimmer switch that controls a light fixture and an outlet. In addition, there is one more black lead that goes somewhere

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[ad#block]Question: I am replacing a dimmer switch that controls a light fixture and an outlet. In addition, there is one more black lead that goes somewhere, not sure where. So while replacing the dimmer, I thought I would separate out the outlet from the light fixture. I have removed a pig tail to the switch and left with 4 black wires. I turned the breaker back on to figure out which black wire is the source back to the breaker. I can touch one wire to two others and get 120 volts on the MM. On the third wire, I get just under 40 volts. What causes only a 40 volt reading on the circuit?

This electrical question came from: Jason, a Homeowner from Whitefield, New Hampshire

See more about Home Wiring for New Hampshire

Additional Comments: Nice resource!

Dave’s Reply:
Thanks for your electrical question Jason

The Following links will assist you with your electrical question:

Wiring a Dimmer Switch

3 Way Dimmer Switch Wiring Diagram

Fully explained 3 way dimmer switch wiring diagram will take the mystery out of wiring a 3-way dimmer switch.

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