What does this diagram show?

A hand-drawn 120V lighting circuit with two switch boxes (3-way switches), a light fixture, wire nut splice points, and a feed from a panel labeled '120V Black Hot'.

What wire colors and functions are labeled?

Black Hot (Return), Red, and White between the first switch box and the light; Black and Red travelers to the second switch box; a White Wire (Neutral); and a 120V Black Hot feed from the Panel.

Where does power originate in this diagram?

From the box labeled 'Panel' at the bottom, via a conductor labeled '120V Black Hot', with the White Wire (Neutral) returning to the panel.

Where are the wire nut splices located?

Two wire nut splices are shown in the light fixture/ceiling box area, and one wire nut is shown in the second (lower) switch box joining the neutral run.

Is this a vehicle wiring diagram?

No. The diagram shows 120V household-style wiring with switch boxes, a light fixture, and a service panel, not automotive wiring.

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Hand-Drawn 3-Way Switch Wiring Diagram - 120V Light Circuit with Two Switch Boxes

Hand-drawn switch wiring diagram with switch boxes, wire nuts and color-coded conductors

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Hand-drawn electrical wiring diagram showing switch boxes, wire nuts and color-coded black, red and white conductors to a panel.

AI caption January 2012 · Photo 2660 of 2964

This document is a hand-drawn wiring diagram (pen on paper) depicting a 3-way switch lighting circuit, apparently for a stairway light. It shows two switch boxes, each containing a 3-way switch, a light fixture in a ceiling box, and a power source labeled 'Panel' supplying 120V. Conductors are labeled by color and function: a 'Black Hot' feed from the panel (marked '120V Black Hot'), a 'White Wire (Neutral)', 'Red' and 'Black' traveler wires between the switches, a 'Black Hot (Return)' wire carrying switched power to the light, and a 'White' conductor. Wire nut splice points are called out with arrows in both the fixture box and the second switch box. A stair-step sketch on the left suggests the two switches control a light over a staircase from top and bottom. Despite being filed in an automotive gallery for a 1979 Ford F-150, this diagram documents household/shop 120V AC wiring, not vehicle wiring. A reader can learn the basic routing of hot, neutral, and traveler conductors in a two-location (3-way) switch circuit, including where splices (wire nuts) are made.

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Frequently asked questions

What does this diagram show?: A hand-drawn 120V lighting circuit with two switch boxes (3-way switches), a light fixture, wire nut splice points, and a feed from a panel labeled '120V Black Hot'.
What wire colors and functions are labeled?: Black Hot (Return), Red, and White between the first switch box and the light; Black and Red travelers to the second switch box; a White Wire (Neutral); and a 120V Black Hot feed from the Panel.
Where does power originate in this diagram?: From the box labeled 'Panel' at the bottom, via a conductor labeled '120V Black Hot', with the White Wire (Neutral) returning to the panel.
Where are the wire nut splices located?: Two wire nut splices are shown in the light fixture/ceiling box area, and one wire nut is shown in the second (lower) switch box joining the neutral run.
Is this a vehicle wiring diagram?: No. The diagram shows 120V household-style wiring with switch boxes, a light fixture, and a service panel, not automotive wiring.