Ford Bronco Auto Headlights Wiring Diagram - AutoLamp Mirror & Relay Add-On
Reference · 1992-1996 BroncoAll 411 wiring diagrams
Wiring diagram showing headlight and parking-lamp relays, a multi-pin connector and color-coded circuits feeding courtesy, dome and exterior lamps.
Part of 1992-1996 Ford Bronco Wiring Diagrams
This is a hand-drawn wiring diagram, uploaded to a 1994 Ford Bronco gallery, showing how to add automatic headlights using an AutoLamp (auto-dimming/autolamp) mirror and two relays. The diagram centers on the factory headlight switch connector with its standard 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) exterior lamps, 54 (LG/Y) 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. Red lines show the added wiring: a White/Pink wire from the AutoLamp mirror drives a Parking Light Relay and a Headlight Relay, which tie into the 14 (BR) splice for parking lamps, the always-hot 195 (T/W) feed, the 15 (R/Y) headlight feed, and the Blue/Orange wire on the MFS. A reader can learn the headlight switch pinout/wire colors and how to interconnect the mirror and relays to trigger parking lamps and headlights automatically.
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Frequently asked questions
- What wire colors and circuit numbers are on the Ford Bronco headlight switch in this diagram?
- 137 (Y/BK) hot in ACC or RUN, 484 (O/BK) to radio harness, 38 (BK/O) always hot from fuse box, 195 (T/W) always hot, 14 (BR) exterior lamps, 54 (LG/Y) courtesy lamps, 55 (BK/PK) to dome lamps, 294 (W/LB) to cluster dimmer circuit, and 15 (R/Y) to the MFS and headlights.
- What triggers the relays in this auto headlight setup?
- A White/Pink wire from the AutoLamp Mirror feeds the Parking Light Relay and Headlight Relay.
- Which wire feeds the headlights from the switch?
- Circuit 15 (R/Y), which goes to the MFS and to the headlights; the added relay wiring also ties into a Blue/Orange wire on the MFS.
- How are the parking lamps connected in this modification?
- The Parking Light Relay output connects to a splice on circuit 14 (BR), the exterior lamps wire, labeled 'To 14 (BR) Splice / Parking Lamps'.
- Which wires on the headlight switch are always hot?
- Circuit 38 (BK/O), which is always hot and connects to the fuse box, and circuit 195 (T/W), labeled Always Hot.
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