Wiring Diagrams — Ford Bronco 1978-1979

Technical Reference

Member-uploaded diagrams & documents for this generation. AI-classified; community-verified where badged.

Wiring Diagrams

• Automotive wiring diagram showing windshield wiper, washer, back-up light and ignition circuits with color-coded wire labels.
• Wiring connector pinout diagram for connectors behind the instrument panel near the radio with color-coded wire IDs
• Wiring diagram of AM/FM radio and CB receiver circuits showing connectors, speakers and color-coded wires
• Custom electric fan control wiring diagram for a 1995 Taurus 3.0L 2-speed setup using Holley Sniper EFI fan outputs, SPDT relays, a 175A MegaFuse and toggle switches.
• Bronco-only power rear window page with how-it-works text and wiring schematic: fuse 10 feed through accessory safety relay to the tailgate three-way switch and two-way motor.
• Wiring diagram page showing conventional and interval windshield wiper circuits with wiper motors, switches, and governor.
• Radio wiring schematic showing the 7.5A fused feed in RUN/ACCY to AM/AM-FM monaural dash speaker and AM/FM stereo door speakers, with a component connector location table.
• Wiring diagram page showing horn and fog-lamp circuits with relays, switches, connectors, and component locations.
• Speed control wiring/operation page showing the servo, amplifier, speed sensor, switch positions (Off/On/Set/Coast), check valve and vacuum reserve tank, plus trouble-shooting steps.
• Heater/AC electrical wiring: blower motor, compressor clutch coil, de-icing switch, resistor pack through fuse 3; includes blower-speed continuity chart for wire 270 (bk/y) at connector C604.
• Heater-only blower wiring: 4-position blower switch and resistor pack fed through fuse 3 vary motor speed; includes terminal 3/4 diagnostic checks and a wiring diagram with connector table.
• Bronco power rear window wiring through fuse 10 and accessory safety relay to dash three-way switch and key-actuated tailgate switch; window motor with limit switch, plus troubleshooting steps.
• Wiring diagram for conventional and interval windshield wipers including wiper motor, governor, and circuit paths.
• Radio wiring through fuse 12 (7.5A): AM/AM-FM monaural and AM/FM stereo radio speakers, CB radio choke and microphone, with door/cowl speaker connector locations and connector descriptions.
• Wiring diagram for the horn and fog-lamp circuits showing relays, switches, and connector descriptions.
• Gage wiring through fuse 5: fuel sender, water temperature sending unit, oil pressure sender, and fuel tank selector valve/solenoid with connector C209-C339, splices and ground table.
• Warning-light wiring: dual brake warning switch, oil pressure switch (varies 300/351-400/450 CID locations), seat belt buzzer through fuse 4 (15A) and fuse (20A), with connector and ground table.
• Control and instrument cluster illumination wiring: light switch rheostat feeds fuse 2 to cluster lights; includes troubleshooting steps for dim/spotty illumination and a wiring diagram with connector table.
• Glove box and cargo lamp wiring: fuse 7 (15A, gray) feeds the in-line fuse, courtesy lamp switches, vanity mirror, cargo lamp switch, and digital AM radio display, with connector locations.
• Turn signal / emergency warning / stop light circuit: fuse 9 (15A) and stop light fuse (15A) feed plunger- and mechanical-type stop switches, turn signal switch, and flashers; shows trailer-tow option wiring.
• Wiring diagram for turn-signal and emergency warning lights with a component-location and connector-description table.
• Backup lamp wiring for Bronco and F-100-350: separate paths for 3-speed/4-speed manual and automatic transmission backup-light switches through fuse 13, with connector and ground locations.
• Trailer wiring schematic tying stop light switch, turn signal flasher, emergency warning flasher, and trailer exterior light relay to the customer-installed trailer connector, with component locations.
• Bronco-only exterior lamp wiring: routes from light switch and dimmer switch through front marker lamps and trailer exterior light relay, with full connector/splice/ground location table.
• Wiring diagram showing marker and rear light circuits with and without the trailer-tow option and headlight switch.
• Wiring diagram routing rear, camper, and running lights through the headlight switch with numbered connectors.
• Wiring diagram for the headlights and marker lights showing connectors, grounds, and circuit routing for F100-F350.
• Exterior lights wiring schematic over a truck body cutaway (Bronco/F-series): headlights, parking/marker/license, turn signals, emergency warning, backup and stop lights with switch locations.
• Ignition system wiring schematic (Ford Duraspark) showing ignition module, coil, distributor, starter relay and engine speed sensor with cranking spark-test procedure (white wire voltage within 1 volt).
• Wiring schematic (Bronco/F100-350) of the headlight switch, ignition switch and 12-position fuse panel showing circuit feeds to accessories, seat belt, carburetor, backup lamps and warning systems.
• Power distribution and charging system wiring schematic (Bronco/F100-350) showing fuse links A-J, junction block, accessory safety relay, alternator and starter relay circuits with/without gauges.
• Main speed control system wiring diagram for Ford F-100/F-350 and Bronco showing speed control amplifier, servo throttle actuator, speed cable sensor, horn switch and 4-position control switch (OFF/ON/SET/COAST) with wire colors.
• Speed control (cruise) system wiring diagram for Ford F-100/F-350 and Bronco showing servo assembly, amplifier, speed sensor, brake switches, 20A fuse and the wire color/stripe code table by circuit number.
• Wiring connector diagram for turn signal flasher (C-806) on Y brace behind I/P with pin wire numbers and color codes.
• Wiring connector diagram for emergency warning flasher (C-805) behind I/P left side with pin wire numbers and color codes.
• Wiring connector diagram for stop lamp switch plunger (C-802) on brake pedal support with pin wire numbers and color codes.
• Wiring connector diagram for steering column assembly (C-713) under I/P with speed control, listing pin wire numbers and colors.
• Wiring connector diagram for steering column assembly (C-305) under I/P, listing all-gray connector pin wire numbers and colors.
• Wiring connector diagram (C-306) at left fender apron rear, showing mating connector pinouts with wire numbers and color codes.
• Wiring connector diagram for rear of instrument cluster printed circuit (C-208) without gages, listing pin wire numbers and colors.
• Wiring connector diagram for distributor assembly (C-322) on engine near distributor, listing pin wire numbers and color codes.
• Wiring connector diagram for breakerless ignition module (C-321) on left fender apron with pin wire numbers and color codes.
• Wiring connector diagram for alternator (C-209) on engine left side, showing pinouts for cluster gages and warning lights.
• Wiring connector diagram for alternator regulator (C-204) at right radiator support, showing pinouts with and without gages.
• Wiring connector diagram for rear of instrument cluster printed circuit (C-208A) listing pin wire numbers and color codes.
• Wiring connector diagram for headlamp switch (C-701) right side behind I/P, listing pin wire numbers and color codes.
• Wiring connector diagram for ignition switch (C-412) behind I/P left side, listing pin wire numbers and color codes.
• Wire color code page covering circuits 908-998: starter motor relay lock-in coil, speed regulator/cruise control, trans neutral switch, throttle solenoid, emission modulator and turn signal switch circuits.
• Wire color code page covering circuits 701-834: CB radio (squelch, push-to-talk, scan), speaker, distributor electronic control, breakerless ignition module, fuel pump relay and speedo servo circuits.
• Wire color code page covering circuits 594-697: oil pressure safety, fuel pump primer, brake skid control module wheel sensors, EGR valve, fuel gauge and tractor-trailer controller circuits.
• Wire color code page covering circuits 374-585: emergency warning flasher, back window switch, seat belt warning relay, fog lamp switch and intermittent governor circuits with wire colors.
• Wire color code page covering circuits 208-371: water temp/delay relay, heater blower, emission control valve, 3-speed axle solenoid valves and alternator relay circuits with wire colors.
• Wire color code page covering circuits 90-207: windshield wiper ground, remote control mirror, power door lock motor, 2-speed axle, glow plug and radio circuits with wire colors.
• Clean standard wire color code page mapping circuits 1-95 to descriptions and wire colors (horn relay, turn signals, headlamp dimmer high/low, 24V alternator output, windshield wiper).
• Continued wire color code reference covering breakerless/transistor ignition (ballast resistor, pick-up coil), starter relay and speed/cruise control circuits with wire colors.
• Continued wire color code reference covering brake skid control module wheel sensors, thermocouple, EGR valve and oil temperature warning circuits with their wire colors.
• Continued wire color code reference mapping circuit numbers to descriptions and wire colors for HVAC, 3-speed axle, alternator and brake skid control circuits on a heavy-duty Ford truck.
• Standard wire color code reference table mapping circuit numbers to descriptions and wire colors (e.g. horn switch to horn relay, headlamp dimmer to high/low beams) for a Ford truck electrical system.
• Wiring diagram showing ignition switch, dual brake and oil pressure warning circuits with color-coded wires and connector pinout charts.
• Wiring diagram of 5.0L electronic engine control, showing the eight fuel injectors, idle air control valve, and canister purge solenoid wired to the PCM.
• Wiring diagram of 5.0L electronic engine control, showing the barometric pressure sensor, park/neutral switch, clutch pedal position switch, and starter relay.
• Wiring diagram of 5.0L electronic engine control, showing the VSS, IAT, ECT, EGR valve position, and throttle position sensors with the PCM and cluster.
• Wiring diagram of 5.0L electronic engine control, showing the fuel pump relay, inertia switch, secondary air injection solenoids, and EGR vacuum regulator.
• Wiring diagram of 5.0L electronic engine control, showing the PCM power relay, mass air flow sensor, heated oxygen sensors, and data link connector.
• Wiring diagram of the 5.0L ignition system, showing the ignition switch, fuse link, PCM, and manual/automatic transmission start circuits.
• Wiring diagram of the 5.0L ignition system, showing the ignition coil, distributor, TFI ignition control module, PCM, and ignition shield circuits.
• Wiring diagram of electronic engine control for a 4-cylinder turbo, showing the vane air flow meter, throttle position, knock, MAP, and coolant temperature sensors.
• Wiring diagram of electronic engine control for a 4-cylinder turbo, showing fuel injectors, EGR solenoid, idle speed actuator, and exhaust gas oxygen sensor.
• Electronic engine control (4-cyl turbo) wiring schematic showing EEC power relay, ECA solid-state module, fuel pump relay, inertia switch, and EEC test connector grounds.
• Wiring diagram of electronic engine control for an 8-cylinder SFI, showing the fuel injectors, canister purge solenoid, and idle speed actuator circuits.
• Wiring diagram of electronic engine control for an 8-cylinder SFI, showing the inertia switch, fuel pump relay, thermactor solenoids, and ignition module.
• Wiring diagram of electronic engine control for an 8-cylinder SFI, showing the EEC power relay, heated EGO sensors, and compressor clutch control circuits.
• Wiring diagram of electronic engine control for an 8-cylinder SFI, showing EGR, throttle position, MAP, and coolant temperature sensor circuits.
• Wiring diagram of the start and ignition system for an 8-cylinder SFI, showing the ignition switch, starter relay, and electronic control assembly.
• Wiring diagram of the start and ignition system for a 4-cylinder turbo, showing the ignition switch, starter relay, and ECA with color-coded wires.
• Comparison wiring schematic for one-touch window modules: stock single-module wiring vs dual-module auto up-and-down setup fed by a 20A circuit breaker.
• Factory wiring diagram for the heater/AC blower-motor circuit: power distribution fuse panels, blower switch positions, blower motor resistors, A/C clutch solenoid, with connector C-590/C-533/C-580 pinout views.
• Scanned chassis-electrical manual page detailing blower motor, lighting, ignition, and wiper wiring circuits with color codes.
• Scanned chassis-electrical service manual page showing two automotive wiring diagrams with circuit routing and connectors.
• Scanned chassis-electrical manual page detailing blower motor, lighting, ignition, and wiper wiring circuits with color codes.
• Scanned chassis-electrical manual page with 1976-78 Ford F-Series body wiring diagrams showing circuits, switches, and connectors.
• Scanned chassis-electrical manual page with two 1976-78 Ford F-Series wiring diagrams showing harness routing and connectors.
• Scanned chassis-electrical manual page with two 1976-78 Ford F-Series wiring diagrams showing harness routing and connectors.
• Scanned chassis-electrical manual page with 1976-78 Ford F-Series body wiring diagrams showing circuits, switches, and connectors.
• Scanned chassis-electrical manual page detailing blower motor, lighting, ignition, and wiper wiring circuits with color codes.
• Scanned chassis-electrical service manual page showing two automotive wiring diagrams with circuit routing and connectors.
• Final sheet of the Haynes 1979 Bronco wiring schematic showing remaining distribution circuits, splices and connectors with wire colors.
• Haynes 1979 Bronco wiring schematic (continued) showing transmission, lamp and connector circuits with splice and wire-color identification.
• Scanned Haynes manual page showing two 1979 Ford Bronco wiring diagrams with circuit lines and component callouts.
• Haynes Bronco wiring schematic (continued) showing connector S-201/S-202, fuse-link runs and transmission/instrument circuits with wire colors.
• Haynes 1979 Bronco wiring schematic (continued) detailing circuit runs, splices and connectors with wire-color and gauge identification.
• Haynes 1978/1979 Bronco wiring schematic showing power distribution, in-line connectors and fuse links with wire color and gauge callouts.
• Wiring diagram detailing ignition switch wiring with annotations identifying the resistor wire to the coil.
• Automotive wiring diagram showing ignition switch, fuel gauge and color-coded circuit branches.
• Wiring diagram for a breakerless ignition system showing distributor, ignition coil, switches and color-coded circuits.