Which wire on the headlight switch is always hot?

Circuit 38 (BK/O — black/orange), which connects to the fuse box, is labeled 'Always Hot.'

What wire feeds the exterior lamps from the headlight switch?

Circuit 14 (BR — brown) goes to the exterior lamps.

Which headlight switch wire is hot only in ACC or RUN?

Circuit 137 (Y/BK — yellow/black) is labeled 'Hot in ACC or RUN.'

What wire goes from the headlight switch to the headlights?

Circuit 15 (R/Y — red/yellow) goes to the MFS (multi-function switch) and to the headlights.

Which wires control the interior lighting?

Circuit 54 (LG/Y) goes to the courtesy lamps, circuit 55 (BK/PK) goes to the dome lamp, and circuit 294 (W/LB) goes to the cluster dimmer circuit.

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1994 Ford Bronco Headlight Switch Wiring Diagram - Wire Colors & Circuits

Headlight switch wiring diagram with color-coded circuits and wire codes to lamps and dimmer

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Wiring diagram of a headlight switch showing color-coded circuits to radio, exterior, courtesy, dome lamps, and instrument dimmer.

AI caption October 2013 · Photo 886 of 3001

This document is a hand-drawn/annotated wiring diagram of a headlight switch connector, uploaded to accompany a 1994 Ford Bronco and titled 'Bronco Roof Marker headlight Switch Tap.' It depicts the headlight switch connector body with its pin cavities and labels each wire by Ford circuit number and wire color code. Circuits shown include: circuit 137 (Y/BK) which is hot in ACC or RUN; circuit 484 (O/BK) going to the radio harness; circuit 38 (BK/O) which is always hot and connects to the fuse box; circuit 14 (BR) feeding the exterior lamps; circuit 195 (T/W); circuit 54 (LG/Y) to the courtesy lamps; circuit 55 (BK/PK) to the dome lamp; circuit 294 (W/LB) to the cluster dimmer circuit; and circuit 15 (R/Y) to the MFS (multi-function switch) and headlights. The diagram appears intended to show where to tap into the headlight switch wiring, likely for adding roof marker lights or auto-headlight functionality (it is part of an album containing related auto-headlight and relay wiring diagrams). A reader can learn the circuit numbers, wire colors, and destinations of each wire on the headlight switch connector.

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Frequently asked questions

Which wire on the headlight switch is always hot?: Circuit 38 (BK/O — black/orange), which connects to the fuse box, is labeled 'Always Hot.'
What wire feeds the exterior lamps from the headlight switch?: Circuit 14 (BR — brown) goes to the exterior lamps.
Which headlight switch wire is hot only in ACC or RUN?: Circuit 137 (Y/BK — yellow/black) is labeled 'Hot in ACC or RUN.'
What wire goes from the headlight switch to the headlights?: Circuit 15 (R/Y — red/yellow) goes to the MFS (multi-function switch) and to the headlights.
Which wires control the interior lighting?: Circuit 54 (LG/Y) goes to the courtesy lamps, circuit 55 (BK/PK) goes to the dome lamp, and circuit 294 (W/LB) goes to the cluster dimmer circuit.