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.

Home/ Registry/ Ford/ Bronco/ 1992-1996/ “Eddie Bauer”/ Photo supermotors.net/registry/media/963315

Ford Bronco Auto Headlight & Parking Light Relay Wiring Diagram (Circuits 14, 15, 57)

Parking light relay and headlight relay wiring diagram with circuit numbers and wire colors

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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).

AI caption January 2013 · Photo 555 of 3001

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.