What wire circuit feeds the headlights from the headlight switch?

Circuit 15 (R/Y, Red/Yellow), which goes to the MFS and to the headlights.

Which wires on the headlight switch are always hot?

Circuit 38 (BK/O), which connects to the fuse box, and circuit 195 (T/W) are labeled Always Hot.

What wire from the AutoLamp mirror triggers the relays?

A White/Pink wire from the mirror feeds the Parking Light Relay and Headlight Relay.

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Ford Bronco Auto Headlights Wiring Diagram - AutoLamp Mirror & Relay Circuits

Headlight and parking-lamp wiring diagram with relays and color-coded wires

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Wiring diagram showing headlight and parking-lamp relays, a multi-pin connector and color-coded circuits feeding courtesy, dome and exterior lamps.

AI caption January 2013 · Photo 554 of 3001

This hand-drawn wiring diagram documents an automatic headlight (AutoLamp) retrofit centered on a headlight switch connector. It labels the switch's wire circuits by Ford circuit number and color code: 137 (Yellow/Black, hot in ACC or RUN), 454 (Orange/Black, to radio harness), 38 (Black/Orange, always hot, connects to fuse box), 14 (Brown, exterior lamps), 195 (Tan/White, always hot), 54 (Light Green/Yellow, courtesy lamps), 294 (White/Light Blue, to cluster dimmer circuit), 53 (Black/Pink, to dome lamps), and 15 (Red/Yellow, to the multifunction switch/headlights). Red overlay lines show the added AutoLamp wiring: an AutoLamp mirror provides a White/Pink signal wire that feeds two added relays — a Parking Light Relay and a Headlight Relay. The parking light relay ties into the 14 (BR) splice for the parking lamps, while the headlight relay connects to the 15 (R/Y) headlight feed and to the Blue/Orange wire on the MFS (multifunction switch). Power for the relays is taken from the always-hot 195 (T/W) circuit. A reader can learn the headlight switch pinout/circuit colors and how to wire an auto-headlight mirror module with relays to control both parking lamps and headlights.

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Frequently asked questions

What wire circuit feeds the headlights from the headlight switch?: Circuit 15 (R/Y, Red/Yellow), which goes to the MFS and to the headlights.
Which wires on the headlight switch are always hot?: Circuit 38 (BK/O), which connects to the fuse box, and circuit 195 (T/W) are labeled Always Hot.
What wire from the AutoLamp mirror triggers the relays?: A White/Pink wire from the mirror feeds the Parking Light Relay and Headlight Relay.
What circuit controls the exterior/parking lamps?: Circuit 14 (BR, Brown) — the Parking Light Relay ties into the 14 (BR) splice for the parking lamps.
Where does the headlight relay output connect on the multifunction switch?: To the Blue/Orange wire on the MFS.