# Is this switch wired correctly?

I'm trying to figure out why my hallway was wired in such as strange fashion:

I have two hallway lights and three switches. Switches 1 and 2 appear to be 3-way switches; if they are both ON or OFF, light 1 is on.

Switch 3 appears to control Light 2 if and only if Light 1 is ON, otherwise it has no effect.

The wires in the junction box for Switch 3 are illustrated below.

When Light 1 is on: When Switch 3 is OFF, Terminal 2 = 120V, T1=0v. When Switch 3 is ON, T2= 120V, T2=120v

Things get confusing when light 1 is off: When Switch 3 is off, the voltage at Terminal 2 is about 12 (not 120), and when Switch 3 is on, it is about 2.

My guess is that the bottom of Switch 3 leads to Light 2, and that the top left of the box for Switch 3 is the return, while top right goes to Light 2.

Is this plausible? Correct? Common?

• You say that your picture illustrates the wires of the Switch 2 and yet on the picture itself the wire details are labeled Switch 3. You are confusing us in addition to your messed up wiring. Nov 9, 2015 at 6:51
• 120 volts to what, ground, neutral? How are you measuring voltage? Nov 9, 2015 at 11:56
• Can you get us photos of the insides of the boxes? Nov 9, 2015 at 12:45
• Yes, though they aren't very clear -- there are 2 wire nuts each with three wires. One wire nut has all three white wires, white wires, other wire nut has the wires from the top two inputs pigtailed to the switch, and from the switch there's a wire to the bottom input. Nov 9, 2015 at 13:56
• @Tester101 Using a multimeter measured from the terminal on the switch to the case of the metal box, which (in theory) should be ground, but might be off a little from neutral. Nov 9, 2015 at 13:58