What circuits are shown on this 1979 Bronco wiring diagram page?

Fig. 10.145 shows interior/courtesy lighting and seat belt warning circuits (headlamp switch feed, courtesy lamps, dome lamp, glove box lamp, cigar lighter, vanity mirror lamp, digital AM radio with clock, seat belt warning switch and lamp). Fig. 10.146 shows the horn and speed control circuits (horn switch, horn relay, low/high pitch horns, speed control switch, amplifier, speed cable sensor, and throttle actuator).

What are the speed control switch positions on the 1979 Bronco?

The diagram lists four switch positions: 1. OFF, 2. ON, 3. SET, 4. COAST.

What wire color feeds the courtesy lamp circuits?

Circuit 54 GR-Y (green-yellow) feeds the courtesy lamp switches, dome/map lamps, glove box lamp and related circuits, while circuit 53 BK-BL (black-blue) runs to the I/P courtesy lamps and dome lamp; power comes via splice S-1103 and fuse panel position F-7.

Which connectors are used for the horns on this diagram?

The low pitch horn connects via C-1603 and the high pitch horn via C-1604; the horn relay uses connector C-301.

What ground points appear on this page?

Ground G-701 is shown for the 57 BK black ground circuit in both diagrams, and G-703 grounds the speed control circuit in Fig. 10.146.

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1979 Ford Bronco Wiring Diagram - Courtesy Lamps, Horn & Speed Control

1979 Ford Bronco Wiring Diagram (Haynes Figs. 10.145-10.146)

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Haynes 1979 Bronco wiring schematics (continued) detailing speed-control and display circuits with splice points and wire colors.

AI caption May 2007 · Photo 106 of 126

This is page 269 from a Haynes repair manual, showing two continuation sheets of the factory-style wiring diagram for the 1979 Ford Bronco (Fig. 10.145 and Fig. 10.146). The upper diagram (Fig. 10.145) covers interior lighting and warning circuits: the headlamp switch feed, R.H. and L.H. courtesy lamp switches, L.H. and R.H. instrument panel courtesy lamps, dome lamp, dome/map switch lamps, digital AM radio with clock receiver, glove box switch and lamp, cigar lighter, vanity mirror switch and lamp, and the seat belt warning indicator switch, lamp, and buckle switch. The lower diagram (Fig. 10.146) covers the horn and speed control (cruise control) circuits, including horn switch, horn relay, low and high pitch horns, speed control switch (positions OFF, ON, SET, COAST), speed control amplifier, speed cable sensor, and throttle actuator. Wire circuit numbers and color codes are labeled throughout (e.g., 54 GR-Y, 53 BK-BL, 460 Y, 297 BK-GR, 57 BK, 560 BR-BL, 151 BL-BK), along with connector identifiers (C-701 through C-724, C-419/420/421, C-713, C-717, etc.), splices (S-805, S-601, S-1103), grounds (G-701, G-703), and fuse panel feeds F-4 and F-7. This is a useful reference for tracing courtesy lighting, seat belt warning, horn, and cruise control wiring on a 1979 Bronco.

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Frequently asked questions

What circuits are shown on this 1979 Bronco wiring diagram page?: Fig. 10.145 shows interior/courtesy lighting and seat belt warning circuits (headlamp switch feed, courtesy lamps, dome lamp, glove box lamp, cigar lighter, vanity mirror lamp, digital AM radio with clock, seat belt warning switch and lamp). Fig. 10.146 shows the horn and speed control circuits (horn switch, horn relay, low/high pitch horns, speed control switch, amplifier, speed cable sensor, and throttle actuator).
What are the speed control switch positions on the 1979 Bronco?: The diagram lists four switch positions: 1. OFF, 2. ON, 3. SET, 4. COAST.
What wire color feeds the courtesy lamp circuits?: Circuit 54 GR-Y (green-yellow) feeds the courtesy lamp switches, dome/map lamps, glove box lamp and related circuits, while circuit 53 BK-BL (black-blue) runs to the I/P courtesy lamps and dome lamp; power comes via splice S-1103 and fuse panel position F-7.
Which connectors are used for the horns on this diagram?: The low pitch horn connects via C-1603 and the high pitch horn via C-1604; the horn relay uses connector C-301.
What ground points appear on this page?: Ground G-701 is shown for the 57 BK black ground circuit in both diagrams, and G-703 grounds the speed control circuit in Fig. 10.146.