What wire color and circuit number feed the headlights from the headlight switch?

Circuit 15 (R/Y — red/yellow), which goes to the MFS (multifunction switch) and to the headlights, connecting to the blue/orange wire on the MFS.

Which headlight switch wires are always hot?

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

What triggers the parking light and headlight relays in this AutoLamp setup?

A white/pink wire from the AutoLamp mirror module triggers both the Parking Light Relay and the Headlight Relay.

Where do the added relays connect for parking lamps?

The Parking Light Relay connects to a splice in circuit 14 (BR — brown), the exterior/parking lamps circuit.

How are the relays grounded?

Both relays ground to circuit 57 (BK — black).

Home/ Registry/ Ford/ Bronco/ 1992-1996/ “Eddie Bauer”/ Photo supermotors.net/registry/media/963557

Ford Bronco AutoLamp Auto Headlights Wiring Diagram - Headlight Switch & Relays

Headlight and lamp wiring diagram with relays and color-coded circuits

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

AI caption January 2013 · Photo 563 of 3001

This document is a hand-drawn style wiring diagram for adding automatic headlights (AutoLamp) functionality, apparently to a Ford Bronco headlight circuit. It centers on the factory headlight switch connector, labeling each pin with Ford circuit numbers and wire colors: 137 (Y/BK) hot in ACC or RUN, 484 (O/BK) to the radio harness, 38 (BK/O) always hot from the fuse box, 195 (T/W) always hot, 14 (BR) to exterior lamps, 54 (LG/Y) to courtesy lamps, 55 (BK/PK) to dome lamps, 294 (W/LB) to the cluster dimmer circuit, and 15 (R/Y) to the multifunction switch (MFS) and headlights (blue/orange on MFS). The diagram shows an AutoLamp Mirror module with a white/pink output wire from the mirror driving two added relays — a Parking Light Relay tapped to the 14 (BR) splice for parking lamps, and a Headlight Relay feeding the 15 (R/Y) headlight circuit — with both relays grounded to circuit 57 (BK). A reader can learn the headlight switch pinout wire colors/circuit numbers and how to wire relays triggered by an auto-dimming AutoLamp mirror to automatically activate parking lamps and headlights.

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Frequently asked questions

What wire color and circuit number feed the headlights from the headlight switch?: Circuit 15 (R/Y — red/yellow), which goes to the MFS (multifunction switch) and to the headlights, connecting to the blue/orange wire on the MFS.
Which headlight switch wires are always hot?: Circuit 38 (BK/O), which connects to the fuse box, and circuit 195 (T/W) are both labeled Always Hot.
What triggers the parking light and headlight relays in this AutoLamp setup?: A white/pink wire from the AutoLamp mirror module triggers both the Parking Light Relay and the Headlight Relay.
Where do the added relays connect for parking lamps?: The Parking Light Relay connects to a splice in circuit 14 (BR — brown), the exterior/parking lamps circuit.
How are the relays grounded?: Both relays ground to circuit 57 (BK — black).