Wiring Diagrams — Ford Bronco 1987-1991

Technical Reference

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

Wiring Diagrams

• Wiring diagram of the Ford 3G alternator charging circuit showing mega fuse, battery, regulator sensing/switching, and Y/W and LG/R wires.
• Wiring diagram of a conventional 1973-1974 point-type ignition system showing battery, coil, distributor, and spark plug with primary and secondary circuits.
• Wiring diagram showing starter relay connections to battery, ignition switch, ignition coil, and starter solenoid and motor.
• Annotated Ford 4-terminal starter solenoid wiring diagram explaining the battery, starter, S start terminal, and I terminal connections.
• Auxiliary lighting wiring diagram showing relays, fuse block, rocker switch, battery and LED light bar with red and blue wires.
• Wiring diagram for a 1986-95 speed-density V8 truck mapping engine sensors, injectors, and EEC pins with circuit numbers.
• Ford speed control (cruise) wiring diagram page 31-2 showing the servo amplifier, modulating valve (40-125/60-190 ohm), servo motor, vacuum dump valve, EEC module and vehicle speed sensor with wire colors.
• Speed control wiring diagram (page 31-1) showing the speed control amplifier, switches, fuse panel, and color-coded circuits with connector callouts.
• Connector pinout diagram identifying EEC test connector pins for STO/CEL, Fuel Pump, SIGRTN and STI signals.
• Wiring diagram of the 5.0L engine controls showing the PCM, MAP sensor, heated oxygen sensor and color-coded circuits.
• Wiring diagram of the courtesy lamps circuit showing dome, map and cargo lamps, door jamb switches and color-coded wires.
• Wiring diagram of the manual level position sensor connector showing terminal circuit numbers and color-coded wires.
• Connector face/pinout chart (page 150-14) for the Ford main light switch, manual level position sensor, and master tailgate window switch with terminal wire colors and circuit IDs.
• Connector face/pinout chart (page 150-12) for the Ford instrument cluster connectors C250 and C251, listing pin numbers, circuit IDs, wire colors and functions for gasoline applications.
• Wiring diagram of warning chime module connector C280 with pin-by-pin circuit functions and wire color codes.
• Wiring diagram of the warning chime circuit showing fuse panels, switches, the chime module and color-coded wires.
• Ignition system wiring diagram showing primary and secondary circuits through coil, amplifier module, breakerless distributor and battery.
• Wiring diagram showing throttle air bypass valve solenoid and diode with circuit 361/67 GY/W wires and splice S165.
• Wiring diagram showing the idle air bypass valve and canister purge solenoid with circuit number 361.
• Wiring diagram detail showing idle speed control and a diode with color-coded RED and GRN/WHT wires.
• Wiring diagram of the instrument cluster showing coolant temperature and oil pressure gauge circuits with color-coded wires.
• Wiring diagram of a relay circuit converting constant to momentary 12v output using a capacitor and fixed resistor.
• A/C-heater electrical wiring diagram showing the clutch cycling pressure switch, blower resistor and color-coded circuits.
• Ford start/ignition (Duraspark) wiring diagram page 27 covering 5.8L and 7.5L: ignition switch, starter relay/motor, 1.005-ohm resistance wire, fuse link, coil and charge circuits.
• Connector pinout diagram showing numbered terminal positions across a multi-pin electrical connector.
• Wiring diagram of a rocker switch showing terminal connections from DC power to a DC motor with positive and negative leads.
• Wiring/pinout diagram of a gray distributor-mounted TFI ignition module showing PIP, SPOUT, coil and ignition-ground terminals.
• Wiring diagram showing battery, transmission case connector, relays and a vacuum switch for overdrive/TCC control.
• Pin-view diagram of a 14-pin module harness connector (two rows, pins 1-8 lower and 9-14 upper) with pin 2 highlighted and a ground symbol at left.
• Engine controls wiring diagram for a 1995 5.0L Bronco showing the fuel pump module, inertia fuel shutoff and color-coded circuits.
• Radio C258 connector pin-out diagram for a 1995 Bronco with a pin-to-speaker-circuit function table and connector reference list.
• Radio C257 connector pin-out diagram for a 1995 Bronco with a table listing each pin's circuit number and function.
• Premium sound radio wiring diagram for a 1995 Bronco showing the amplifier, speaker circuits and color-coded wiring.
• Radio wiring diagram for a 1995 Bronco showing speaker circuits, fuse panel, illumination feed and color-coded wiring.
• Mass air flow sensor connector wiring diagram showing color-coded MAF SIG, RTN, GND and VPWR wires with an electrical test conditions table.
• 1988-93 Mass Air Mustang EEC-IV engine wiring diagram mapping sensors (ECT, ACT, TPS, BP, VSS, MAF, HEGO) and 8 injectors to EEC pin numbers and grounds.
• A/C-heater schematic for 1995 Ford Bronco: PCM-controlled A/C clutch, cycling pressure switch and high-pressure cut-out switch with kPa/psi thresholds and connector reference list.
• Manual A/C-heater electrical schematic for 1995 Ford Bronco gasoline trucks: blower motor resistor, thermal limiter, function selector switch and A/C clutch cycling pressure switch circuits with wire colors.
• 1995 Bronco 5.0L engine controls wiring (24-1, second crop) detailing PCM power diode/relay, fuel pump relay, MAF sensor, E40D/4R70W transmission feeds and inertia fuel shutoff.
• 1995 Bronco 5.0L engine controls wiring (24-1) showing PCM power relay, fuel pump relay, PCM power diode, MAF sensor, data link connectors and 20A power-distribution feeds.
• Start/ignition wiring (20-4) for 5.0L/5.8L showing TFI ignition module, ignition coil, distributor, suppression resistor, EEC module and power relay with wire codes R/LG, DG/Y, DB.
• Instrument cluster wiring (60-2, gas without tach) showing fuel, coolant temp, oil pressure gauges and voltmeter fed by fuse 18 via 640 R/Y; lists fuel sender 145 ohms full / 22.5 ohms empty.
• Instrument cluster wiring diagram for gas-with-tachometer clusters showing fuel, temperature, oil pressure gauges, senders and color-coded circuits.
• Powertrain control module C185 gray connector pin-out diagram for a 1995 5.8L Bronco showing each pin position with its wire color code.
• Charging system wiring diagram for a 1995 Bronco showing the generator/voltage regulator, battery, charge indicator and color-coded circuits.
• 5.0L engine-controls schematic showing PCM, PCM power relay/diode, fuel pump relay, mass air flow sensor, E4OD/4R70W transmission feeds and data link connectors (DLC).
• Wiring diagram for 5.8L California engine controls showing the powertrain control module, heated oxygen sensor, malfunction indicator lamp and color-coded circuits.
• Wiring diagram for the EFI 5.0L electronic engine control showing ECA, emissions solenoids, sensors, and numbered circuits.
• Starting system schematic showing 32 R/LB start circuit through the TR sensor (allows start in Park/Neutral), starter relay, and starter motor solenoid grounds.
• Wiring diagram for the 1995 Bronco starting system showing ignition switch, clutch pedal position switch, and anti-theft module.
• Wiring diagram for the 1995 Bronco backup lamp circuit showing transmission range sensor and backup lamp switch.
• Wiring diagram for the 1995 Bronco E4OD transmission showing PCM, transmission range sensor, and color-coded circuits.
• Wiring diagram for the 1995 Bronco anti-theft system showing door lock motors and ignition cylinder tamper sensor circuits.
• Wiring diagram for the 1995 Bronco anti-theft system showing ignition, headlamp, and remote keyless entry circuits.
• Wiring diagram for the 1995 Bronco anti-theft system showing controller module, door switches, and color-coded circuits.
• Wiring diagram of a remote-mounted TFI ignition module showing distributor connector, EEC pins, and shielding.
• Wiring diagram of a distributor-mounted TFI ignition module showing EEC pins, SPOUT connector, ignition relay, and battery.
• RJM wiring diagram for a gray remote-mounted TFI ignition module: distributor connector, SPOUT connector, 22K-ohm resistor and EEC pins 4/16/36/56, fed by ignition relay and battery.
• RJM wiring diagram for a gray distributor-mounted TFI ignition module: 6-pin connector, SPOUT connector, 22K-ohm IDM resistor and EEC pins 4/16/36/56, fed by ignition relay and battery.
• Ignition system schematic showing PCM, SPOUT check connector, Ignition Control Module (ICM), distributor, ignition coil and radio capacitor; coil produces up to 40,000-volt secondary pulses.
• Ford 5.0L/5.8L Start/Ignition schematic (page 20-4): EEC control, TFI ignition module and shield, timing test lead, ignition coil and radio suppression circuits with wire codes (R/LG, BK/O, DG/Y).
• RJM Speed Density EEC-IV wiring schematic for 1986-95 Ford V8 trucks: ECT, ACT, TPS, MAP, VSS, HEGO sensors and 8 injectors mapped to EEC pins, ground codes and EFI relay.
• Wiring diagram showing TFI coil and Duraspark module circuits with color-coded wires and numbered connector pins.
• Rear Anti-Lock Brake (RABS) wiring schematic showing the 1400-ohm rear axle sensor, RABS module, RABS valve assembly with 1.2 and 4.0 ohm coils, and 4x4 hi/low indicator switch.
• 1989-95 Mass Air Flow (MAF) sensor connector pinout identifying terminals A-D as +12V, ground, MAF-RTN, and MAF signal.
• Hand-drawn wiring diagram showing color-coded ignition wires to toggle switches for ACC, IGN and a push-button starter.
• Connector faces/pinout (150-19) showing the TFI module connector terminals with circuit numbers and wire color codes for 4.9L/5.0L/5.8L.
• HEGO sensor connector pinout diagram labeling the +12 volts, ground, signal return, and HEGO signal terminals.
• Kawasaki KLX 140/140L wiring diagram with handwritten owner notes marking the front headlight switch, battery and ground; shows ignition coil, magneto, starter motor, relays and color code key.
• Ignition system diagram (21-2, 1995 Bronco) showing ICM connector C1021 pinout with circuit colors and a pin function table.
• In-line connector faces (150-2, 1995 Bronco) showing C103F and C103M pin layouts with circuit numbers and wire color codes.
• Transmission Range (TR) sensor component testing: ohmmeter resistance values per shift position for W/E4OD and W/4R70W, with circuit numbers, wire colors, and schematic.
• E4OD automatic transmission wiring schematic showing PCM control of the transmission oil temperature sensor, coast clutch, shift solenoids 1 and 2, TCC solenoid and Electronic Pressure Control (EPC) solenoid.
• E4OD transmission wiring diagram (30-2, gasoline) showing EEC module connections, manual lever position sensor, and color-coded solenoid circuits.
• E4OD transmission connector C1048 (gray) 12-pin pinout: power from PCM relay, shift solenoids, TCC, coast clutch, fluid temp sensor, EPC with circuit numbers and wire colors.
• E4OD transmission connector pinout for diesel applications: 12-pin chart with shift solenoids, TCC, coast clutch, oil temp sensor, and separate EPC circuits for gas (925 W/Y) and diesel (912 W/R).
• Horn/cigar lighter wiring diagram (44-1) showing with and without speed control circuits, fuse panel feeds, relays, and grounds.
• Grounds diagram (G103, 10-8) for 5.0L showing ground circuit 89 routing from EEC module and HEGO sensor through splices to G103.
• Trailer wiring color-code chart mapping connector functions to wire colors and minimum gauges: right turn green, left turn yellow, ground white, brake blue, battery red, backup purple.
• Trailer wiring diagram with color-coded wires (green, yellow, brown, white) routed to rear markers, stop/turn lamps, and grounds.
• Ford shop-manual diagram 17-09-35 of the E4OD transmission solenoid-body connector showing test harness T89T-70100-A terminal locations and wire color codes.