What years and model does this wiring diagram cover?

The diagram is titled "'75-77 Bronco Power Distribution," covering 1975–1977 Ford Broncos, with several circuits noted as '75 ONLY or NEW YORK '75 ONLY.

What are the ignition switch positions shown?

S-START, R-RUN, O-OFF, and A-ACCY, with terminals B, I, S, A, and P shown at connectors C-240, C-241, and C-242.

What wire feeds the starter motor relay from the ignition switch?

Circuit 32 R-BU (red-blue) runs from the ignition switch S terminal to the starter motor relay I terminal via connectors C-211/C-214, with battery feed through C-207.

What is special about connector C-249 on 1975 models?

A note states that for '75 only, the Pu/Bu (735) and Bk/Gn (733) wires are reversed in C-249, the breakerless ignition modulator connector on the left side of the cowl.

What distributor is shown in the diagram?

An 8-cylinder 302 breakerless distributor (connector C-209), wired to the breakerless ignition modulator via wires 735 PU-BU, 733 BK-GN, 734 O-Y, and 232 GN-Y, with a 1.10 ohm ±0.5 resistance wire (16 R-GN) from the ignition switch.

What does the carburetor valve control solenoid apply to?

The diagram notes the carburetor valve control solenoid (connector C-262) is for high altitude vehicles only (RPO).

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1975-1977 Ford Bronco Power Distribution Wiring Diagram - Ignition, Charging

1975-1977 Ford Bronco power distribution wiring diagram, color-coded

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1975-77 Bronco power distribution wiring diagram: alternator, voltage regulator, starter relay, ignition switch positions, fuse panel, breakerless ignition module and neutral safety switch, with boxed repair-location codes.

AI caption July 2021 · Photo 4 of 33

This is a color-coded power distribution wiring diagram for 1975–1977 Ford Broncos, titled "'75-77 Bronco Power Distribution," with boxed codes referencing a repair locations grid (columns 1–15, rows A–J). It traces circuits from the alternator, alternator voltage regulator, battery, starter motor relay, and starter motor through the ignition switch (positions S-Start, R-Run, O-Off, A-Accy), loop ammeter, fuse links, and fuse panel positions (Fuses 1–5 at grid codes A38, A19, B31, A34, A33). It covers the breakerless ignition modulator and 8-cylinder 302 breakerless distributor with ignition coil, the neutral safety switch (auto/manual trans), instrument cluster voltage regulator, oil pressure/water temperature/fuel gauges and senders, fuel tank selector switch, front and rear fuel gauge senders, dual brake warning switch and brake warning lamp, horn relay, horn speed switch, cable speed sensor, horn selector relay, city/country/low-pitch horns, engine block heater, and the high-altitude carburetor valve control solenoid (RPO). Every wire is identified by circuit number and color code (e.g., 32 R-BU, 904 GN-R, 297 BK-GN, 735 PU-BU), and connectors (C-201 through C-414), splices (S-201–S-205), and grounds (G-201–G-205) are labeled with physical locations. Notes flag '75-only and New York '75-only variations, including reversed Pu/Bu and Bk/Gn wires in connector C-249.

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Frequently asked questions

What years and model does this wiring diagram cover?: The diagram is titled "'75-77 Bronco Power Distribution," covering 1975–1977 Ford Broncos, with several circuits noted as '75 ONLY or NEW YORK '75 ONLY.
What are the ignition switch positions shown?: S-START, R-RUN, O-OFF, and A-ACCY, with terminals B, I, S, A, and P shown at connectors C-240, C-241, and C-242.
What wire feeds the starter motor relay from the ignition switch?: Circuit 32 R-BU (red-blue) runs from the ignition switch S terminal to the starter motor relay I terminal via connectors C-211/C-214, with battery feed through C-207.
What is special about connector C-249 on 1975 models?: A note states that for '75 only, the Pu/Bu (735) and Bk/Gn (733) wires are reversed in C-249, the breakerless ignition modulator connector on the left side of the cowl.
What distributor is shown in the diagram?: An 8-cylinder 302 breakerless distributor (connector C-209), wired to the breakerless ignition modulator via wires 735 PU-BU, 733 BK-GN, 734 O-Y, and 232 GN-Y, with a 1.10 ohm ±0.5 resistance wire (16 R-GN) from the ignition switch.
What does the carburetor valve control solenoid apply to?: The diagram notes the carburetor valve control solenoid (connector C-262) is for high altitude vehicles only (RPO).