Where is the horn relay located on this Ford truck?

Per the component location table, 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, and yellow/green (y/gr) to the high pitch horn (dual horns only).

Do the fog lamps apply to the Bronco?

The fog lamps diagram is labeled 'F100-350 Only', so per this document it applies only to F100 through F350 trucks.

Where does the fog lamp circuit ground?

The fog lamps ground through black (bk) wires to ground G1303, located on the LH radiator support.

What is connector C305 and where is it?

Connector C305 is a curved, grey, 11-terminal connector located under the instrument panel, near the steering column.

Home/ Registry/ Ford/ Bronco/ 1978-1979/ “Black Betty”/ Photo supermotors.net/registry/media/1105101

1979 Ford Bronco/F100-F350 Horn & Fog Lamp Wiring Diagram - Page 33

Wiring diagram page for horn and fog lamp circuits with relays and connectors

‹ ›

Wiring diagram page showing horn and fog-lamp circuits with relays, switches, connectors, and component locations.

AI caption March 2017 · Photo 1635 of 1711

This page (page 33) from a Ford wiring diagram manual covers two circuits: the Horn circuit and the Fog Lamps circuit (labeled 'F100-350 Only'). The horn diagram shows power coming from the headlight switch (hot at all times, see page 9) through either the horn switch directly (without speed control) or through connector C713 and a horn relay (with speed control). Wire colors include yellow (y), blue/yellow (bl/y), and yellow/green (y/gr). It shows routing through connector C305 and splice S601 to the speed control switch (page 46), and branches for low pitch horn (all trucks) and high pitch horn (dual horns only). The fog lamp diagram shows feeds from the starter relay (bk/o wire) through part of the headlamp switch (closed in parking/headlight position), a brown wire through connector C901 to the fog lamp switch, then via bl/bk to the fog lamp relay, which powers the LH and RH fog lamps through connectors C1306 and C1307 (gray wires), grounding at G1303. Component location tables list the horn relay (on dash panel, high LH side of steering column), connector C305 (curved, grey, 11 terminals), fog lamp switch/relay locations, and connector descriptions for C901, C1306, and C1307.

Is this accurate? Sign in to help verify it.

Frequently asked questions

Where is the horn relay located on this Ford truck?: Per the component location table, 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, and yellow/green (y/gr) to the high pitch horn (dual horns only).
Do the fog lamps apply to the Bronco?: The fog lamps diagram is labeled 'F100-350 Only', so per this document it applies only to F100 through F350 trucks.
Where does the fog lamp circuit ground?: The fog lamps ground through black (bk) wires to ground G1303, located on the LH radiator support.
What is connector C305 and where is it?: Connector C305 is a curved, grey, 11-terminal connector located under the instrument panel, near the steering column.