Ford Bronco Auto Headlight & Parking Light Relay Wiring Diagram (Circuits 14, 15, 57)
Reference · 1992-1996 BroncoAll 411 wiring diagrams
Wiring schematic for parking-light and headlight relays showing terminals 30/85/86/87, ground 57 (BK), and circuits 14 (BR), 15 (R/Y), 195 (T/W) and 38 (BK/O).
Part of 1992-1996 Ford Bronco Wiring Diagrams
This hand-drawn wiring diagram shows how to wire two standard automotive relays, a Parking Light Relay and a Headlight Relay, for an automatic headlight setup, apparently triggered from an auto-dimming mirror circuit. Both relays are shown with standard Bosch-style pinouts (terminals 30, 85, 86, 87). On the Parking Light Relay, wire 14 (BR, brown) feeds terminal 87, wire 195 (T/W, tan/white) connects to terminal 30, and the trigger signal labeled 'Mirror (W/P)' (white/purple) energizes terminal 85. On the Headlight Relay, wire 15 (R/Y, red/yellow) feeds terminal 87 and wire 38 (BK/O, black/orange) connects to terminal 30, with the same Mirror (W/P) signal energizing terminal 85. Terminal 86 of both relays ties together and runs to circuit 57 (BK, black) ground, shown with a chassis ground symbol. The diagram uses Ford factory circuit numbers and color codes, letting a reader identify which vehicle harness wires to tap for parking lights (14/195), headlights (15/38), and ground (57) when adding relays for an automatic headlight modification. It is one page of a multi-page set covering an auto-headlight/mirror wiring project on a Ford Bronco.
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Frequently asked questions
- Which wire triggers both the parking light and headlight relays?
- The 'Mirror (W/P)' wire (white/purple) connects to terminal 85 of both the Parking Light Relay and the Headlight Relay, energizing both coils.
- How are the relays grounded?
- Terminal 86 of both relays is tied together and runs to circuit 57 (BK), the black ground wire, shown with a chassis ground symbol.
- Which circuits connect to the Parking Light Relay?
- Wire 14 (BR, brown) goes to terminal 87, wire 195 (T/W, tan/white) goes to terminal 30, and the Mirror (W/P) signal goes to terminal 85.
- Which circuits connect to the Headlight Relay?
- Wire 15 (R/Y, red/yellow) goes to terminal 87 and wire 38 (BK/O, black/orange) goes to terminal 30, with Mirror (W/P) on terminal 85 and ground 57 (BK) on terminal 86.
- What relay terminal numbers are used in this diagram?
- Both relays use standard terminals 30, 85, 86, and 87.
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