Where is the horn relay located on a 1979 Ford Bronco/F-Series truck?

The horn relay is on the dash panel, high LH side of the steering column, mounted on the speed control amplifier.

What wire colors are used in the horn circuit?

Yellow (y) from the headlight switch, blue/yellow (bl/y) to the horns and speed control switch, yellow/green (y/gr) to the high pitch horn, and black (bk) for the horn switch ground.

Which trucks does the fog lamp diagram apply to?

The fog lamp circuit is labeled 'F100-350 Only.'

What is connector C1307 and where is it located?

Connector C1307 is an oval, black, 2-terminal connector located on the LH side near the grille.

Where does the fog lamp circuit ground?

At ground G1303, located on the LH radiator support.

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

Horn and fog lamps wiring diagram with relays and connectors

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Wiring diagram for the horn and fog-lamp circuits showing relays, switches, and connector descriptions.

AI caption August 2014 · Photo 33 of 48

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.

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Frequently asked questions

Where is the horn relay located on a 1979 Ford Bronco/F-Series truck?: The horn relay is on the dash panel, high LH side of the steering column, mounted on the speed control amplifier.
What wire colors are used in the horn circuit?: Yellow (y) from the headlight switch, blue/yellow (bl/y) to the horns and speed control switch, yellow/green (y/gr) to the high pitch horn, and black (bk) for the horn switch ground.
Which trucks does the fog lamp diagram apply to?: The fog lamp circuit is labeled 'F100-350 Only.'
Where does the fog lamp circuit get its power?: From the starter relay (hot at all times, via a bk/o wire through part of the headlamp switch, closed in parking/headlight position) and from splice S209 (hot at all times, bk/y wire), as shown on page 8.
What is connector C1307 and where is it located?: Connector C1307 is an oval, black, 2-terminal connector located on the LH side near the grille.
Where does the fog lamp circuit ground?: At ground G1303, located on the LH radiator support.