If you have ever stood in a hallway and realized one 3-way switch is flipped UP while the other is flipped DOWN just to keep the light on, you are dealing with out-of-sync toggles. The direct answer to how to get both light switches down (meaning both toggles rest in the same physical position when the light is OFF, and both are UP when the light is ON) is to swap the two traveler wires on the brass screws of exactly one of the 3-way switches. You do not need to rotate the switch upside down, and you do not need to re-run cable.
In a standard 3-way circuit, the physical toggle position does not inherently mean 'on' or 'off' like a single-pole switch. The circuit completes based on the internal wiper connecting the common terminal to one of two traveler terminals. When switches are out of sync, it simply means the traveler wiring logic is inverted relative to the physical toggle orientation. By swapping the travelers on one switch, you invert its logic, perfectly syncing both toggles.
This procedure involves working inside electrical boxes with 120V AC mains voltage. Before opening any wall plate, you MUST de-energize the circuit at the main breaker panel. Lock out or tag the breaker to prevent accidental re-energizing. Verify the circuit is dead using a non-contact voltage tester (NCVT) and a digital multimeter before touching any wire. Local electrical codes (NEC-style guidance) may require a licensed electrician for certain modifications; your local Authority Having Jurisdiction (AHJ) has final authority.
Tools, Materials, and Device Ratings
To execute this swap cleanly and safely, you need the right diagnostic tools and replacement hardware. Do not guess wire gauges; match the device rating to your branch circuit breaker.
- Voltage Testers: Klein NCVT-3 non-contact voltage tester and a Fluke 117 digital multimeter for verifying dead circuits and testing continuity.
- Switches: Two matching 3-way switches. For a 15A lighting circuit, use the Leviton 5603-2W (15A, 120V AC). For a 20A circuit, use the Leviton 5604-2W (20A, 120V AC).
- Wire Prep: Klein 11055 wire strippers (calibrated for 14 AWG and 12 AWG solid copper) and a Phillips #2 screwdriver.
- Assumed Cable: Standard 14/3 NM-B (Romex) with black, red, white, and bare copper conductors for 15A circuits, or 12/3 NM-B for 20A circuits.
3-Way Switch Terminal and Wire Color Map
Before touching a screwdriver, you must understand the terminal layout of a standard 3-way switch. The following table outlines the exact termination points, wire colors, and torque specifications based on NEC 2023 Article 404.2 and standard manufacturer spec sheets.
| Terminal Type | Screw Color | Wire Function | Wire Color (14/3 NM-B) | Wire Gauge | Torque Spec |
|---|---|---|---|---|---|
| Common | Black / Dark | Line (Hot) OR Load | Black | 14 AWG (15A) / 12 AWG (20A) | 12-14 in-lbs |
| Traveler 1 | Brass | Traveler A | Red | 14 AWG / 12 AWG | 12-14 in-lbs |
| Traveler 2 | Brass | Traveler B | Black (or White re-identified) | 14 AWG / 12 AWG | 12-14 in-lbs |
| Ground | Green | Equipment Ground | Bare Copper / Green | 14 AWG / 12 AWG | 12-14 in-lbs |
| Neutral (Box) | N/A (Wire nut) | Neutral Pass-through | White | 14 AWG / 12 AWG | N/A (Wire nut) |
Why 3-Way Toggles Fall Out of Sync
Inside a 3-way switch, the toggle lever moves a conductive wiper between the common terminal and one of the two traveler terminals. When you install a new switch or replace an old one, the physical orientation of the toggle (up vs. down) relative to the internal wiper position might be inverted compared to the switch at the other end of the hallway.
If Switch A connects its common to Traveler 1 when flipped UP, but Switch B connects its common to Traveler 1 when flipped DOWN, the switches are out of sync. To turn the light on, one toggle must be UP and the other DOWN. By swapping the red and black traveler wires on the brass screws of Switch B, you force Switch B to use Traveler 2 when flipped UP. This perfectly mirrors the logic of Switch A, ensuring that when both toggles are DOWN, the circuit is open (light OFF), and when both are UP, the circuit is closed (light ON).
Step-by-Step: Rewiring to Get Both Light Switches Down
We will perform the traveler swap at 'Switch B' (the switch furthest from the breaker panel, usually the load side, though the swap works identically on either switch). Ensure your circuit is 15A with 14 AWG wire or 20A with 12 AWG wire.
- De-energize and Verify: Turn OFF the 15A or 20A breaker feeding the circuit. Test the non-contact voltage tester on a known live circuit to verify the tool works, then test the wires inside both switch boxes. Confirm 0V AC.
- Extract Switch B: Remove the wall plate and the two mounting screws. Gently pull the Leviton 3-way switch out of the box. Do not disconnect any wires yet.
- Identify the Common Wire: Locate the single black (or dark-colored) screw on the switch. The wire connected to this screw is your Common (either the Line hot from the breaker or the Load wire going to the light fixture). Do not move this wire. It must remain on the black screw.
- Identify the Travelers: Locate the two brass-colored screws. Note the wire colors connected to them. In a standard 14/3 NM-B run, these will be the red wire and the black wire (or a white wire wrapped in black electrical tape).
- Disconnect the Travelers: Using your Phillips #2 screwdriver, loosen the terminal screws and remove the red traveler wire from the top brass screw and the black traveler wire from the bottom brass screw. Straighten the wire hooks with your pliers.
- Swap and Re-terminate Travelers:
- Wrap the red traveler wire clockwise around the bottom brass screw and tighten to 12-14 in-lbs.
- Wrap the black traveler wire clockwise around the top brass screw and tighten to 12-14 in-lbs.
- Verify Ground and Neutral: Ensure the bare copper ground wire is securely terminated to the green grounding screw on the switch strap. Look into the back of the box and verify the white neutral wires are spliced together with a wire nut and pushed to the back of the box (NEC 404.2(A) requires the neutral to be present at the switch box for future smart switch compatibility).
- Mount and Restore Power: Carefully fold the wires back into the box, mount the switch, attach the wall plate, and turn the breaker back ON.
Verify and Test: Expected Multimeter Readings
Do not just flip the switch and assume the job is done. Verify the sync and the voltage stability using your Fluke 117 multimeter.
- Test 1 (Both Down): Flip both switches to the DOWN position. The light should be OFF. Measure voltage at the light fixture's hot terminal. Expected reading: 0V AC.
- Test 2 (Both Up): Flip both switches to the UP position. The light should turn ON. Measure voltage at the fixture. Expected reading: 114V to 126V AC (nominal 120V).
- Test 3 (Crossed Toggles): Put Switch A UP and Switch B DOWN. The light should turn OFF. Expected reading at fixture: 0V AC.
If the light behaves correctly in all four toggle combinations and both toggles rest in the DOWN position when the light is off, your traveler swap was successful.
The Most Common Botch and Its Symptom
The most frequent mistake DIYers make when trying to fix 3-way switches is misidentifying the Common wire and connecting the Line (Hot) or Load wire to a brass traveler screw.
The Symptom: If you put the black hot wire on a brass screw and a red traveler wire on the black common screw, the circuit logic breaks entirely. The light will only turn on if Switch A is held in one specific position (e.g., UP). If Switch A is flipped DOWN, Switch B will do absolutely nothing, regardless of whether you flip it up or down. In worse scenarios, if the Line and Load wires are both landed on brass screws and the internal wiper bridges them, you can create a dead short that will instantly trip the breaker or melt the switch contacts.
The Fix: Always identify the Common wire before disconnecting anything. If you have already pulled the wires out and lost track, use your multimeter. With the breaker ON (exercise extreme caution), carefully measure voltage to ground on the loose wires. The wire that reads 120V AC is your Line (Hot) and must go to the black common screw of Switch A. The wire that shows continuity to the light fixture (with the breaker OFF) is the Load and must go to the black common screw of Switch B. The remaining two wires in the 3-conductor cable are your travelers and belong on the brass screws.
