1979 Ford Bronco/F100-F350 Horn & Fog Lamp Wiring Diagram - Relays & Connectors

This page (page 33) from a Ford wiring diagram manual covering the Bronco and F100 through F350 trucks presents two circuit diagrams: the Horn circuit and the Fog Lamps circuit (fog lamps noted as 'F100-350 Only'). The horn diagram shows power coming from the headlight switch (hot at all times, see page 9), splitting into 'Without Speed Control' and 'With Speed Control' branches. The speed-control version routes through a horn relay and connectors C713 and C305, with splice S601 feeding the speed control switch (page 46). Wire colors include yellow (y), blue/yellow (bl/y), yellow/green (y/gr), and black (bk). The diagram distinguishes 'Low Pitch Horn Only' from 'Dual Horns Only' configurations for the low- and high-pitch horns. The fog lamp diagram shows power from the starter relay and splice S209 (page 8), routed through part of the headlamp switch (closed in parking/headlight position), the fog lamp switch, and a fog lamp relay to the LH and RH fog lamps, grounding at G1303. Wire colors include bk/o, br, bk/y, gy, bl/bk, and bk. Component location tables identify the horn relay on the dash panel, connector C305 (curved, grey, 11 terminals) under the instrument panel, the fog lamp switch and relay on the LH instrument panel, connectors C901, C1306, C1307 with descriptions, and ground G1303 on the LH radiator support.