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- Aug 23, 2007
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I've collected a lot of bronco factory wiring info over the years and would like to share the wealth. These circuits are for 75+ but almost all colors are the same for earlier years. These are real helpful for troubleshooting.
Color–––––––––––––––Circuit #–––––Description
Blue-yellow––––––––––––1–––––horn Switch To Horn Relay
White-lt Blue Stripe–––––2–––––rh Front Turn Signal Lamp
Lt Green-white Stripe––––3–––––lh Front Turn Signal Lamp
White-black Stripe––––––4–––––electric Choke To Alternator "S" Term
Yellow-lt Green Hash–––––6–––––horn Relay To Horn
Orange-yellow Stripe–––––8–––––turn Signal Flasher Feed
Lt Green-black Stripe––––12–––––headlamp Dimmer Switch To High Beams
Red-black Stripe––––––––13–––––headlamp Dimmer Switch To Low Beams
Red-yellow Stripe–––––––15–––––headlamp Switch To Headlamp Dimmer Switch
Red-lt Green Stripe–––––16–––––ignition Switch To Ignition Coil Batt. Term.
Lt Blue-red Stripe––––––19–––––instrument Panel Lamps Feed
Yellow––––––––––––––––21–––––ignition Sw Main Power
Black-orange––––––––––25–––––power Feed To Headlamp Switch
Black-red–––––––––––––26–––––alternator Ground At Voltage Reg
Black-white–––––––––––28–––––windshield Wiper Sw. To Windshield Wiper Motor
Yellow-white Stripe–––––29–––––fuel Gage To Aux Tank Fuel Gage Sender
Black-green–––––––––––30–––––constant Voltage Unit And Indicator Lamps Feed
White-red Stripe–––––––31–––––oil Pressure Indicator To Oil Pressure Sending Unit
Red-lt Blue Stripe–––––––32–––––starter Control
Yellow––––––––––––––––33–––––starter Solenoid To Horn Relay
Orange–––––––––––––––35–––––alternator Regulator "f" Term. To Alternator
Black-yellow–––––––––––37–––––ammeter To Fusebox, Alternator Output To Main Power In
Black-red–––––––––––––38–––––starter Solenoid To Ammeter
Red-white Stripe–––––––39–––––temp. Gage To Temp. Sending Unit
Lt Blue-white Stripe–––––40–––––cigar Lighter Feed
Lt Blue––––––––––––––––44–––––turn Signal Flasher To Turn Signal Switch
White-blue––––––––––––49–––––right Hand Turn Signal Indicator
Green-white–––––––––––50–––––left Hand Turn Signal Indicator
Black-lt Blue Stripe–––––53–––––courtesy Lamp Switch To Courtesy Lamp
Lt Green-yellow Stripe–––54–––––interior Lamp Switch Feed
Dk Blue–––––––––––––––56–––––windshield Wiper Sw. To Windshield Wiper Motor
Black–––––––––––––––––57–––––ground Circuit
White-orange––––––––––58–––––windshield Wiper Sw. To Windshield Wiper Motor
Black-white–––––––––––60–––––constant Voltage Unit To Gage
Red––––––––––––––––––63–––––windshield Wiper Sw. To Windshield Wiper Motor
Yellow-black Hash––––––137–––––radio Antenna Switch Feed
Black-red–––––––––––––140–––––back-up Lamp
Yellow––––––––––––––––152–––––voltage Regulator Feed
Green-yellow––––––––––232–––––coil To Breakerless Ign Module
Brown––––––––––––––––262–––––starting Motor Relay To Ign. Coil "1" Term.
Dk Green–––––––––––––282–––––turn Signal Sw. To Rh Rear Turn Signal Lamp
Yellow-black Stripe–––––283–––––turn Signal Sw. To Lh Rear Turn Signal Lamp
Red––––––––––––––––––284–––––headlamp Sw To Stoplight Sw
Brown––––––––––––––––285–––––headlamp Sw To Exterior Lights
Orange–––––––––––––––286–––––main Fuel Sender To Fuel Gauge
Red––––––––––––––––––296–––––horn Speed Sensor Switch (ny Only)
Black-lt Green Hash–––––297–––––accy. Feed From Ignition Switch
Red-white Hash––––––––383–––––emergency Warning Flasher Feed
White-red Hash––––––––385–––––flasher To Emergency Warning Switch
Brown––––––––––––––––399–––––heater Blower Switch Feed
Yellow––––––––––––––––460–––––country Horn (ny Only)
Yellow-green––––––––––461–––––city Horn (ny Only)
Blue-yellow––––––––––––482–––––horn Speed Sensor Override Switch (ny Only)
Green–––––––––––––––––614–––––horn Speed Sensor Switch To Speed Cable Sensor (ny Only)
Red-yellow Hash––––––––640–––––distributor Modulator Feed
Black-green––––––––––––733–––––distributor To Breakerless Ign Module
Orange-yellow––––––––––734–––––distributor To Breakerless Ign Module
Purple-blue––––––––––––735–––––distributor To Breakerless Ign Module
Orange-white––––––––––763–––––wiper Power Feed
Red-black–––––––––––––810–––––stoplamp Sw. To Turn Signal Switch
Lt Green-red Stripe–––––904–––––Ign. Sw. To Alt. Reg. (ign. Term.)
Blue––––––––––––––––––932–––––carburetor Throttle Solenoid
White-black Stripe––––––950–––––washer Control Switch Feed
Green-black–––––––––––951–––––washer Pump Motor Feed
Purple-white Stripe–––––977–––––brake Warning Switch To Indicator Lamp
Brown––––––––––––––––984–––––marker Lamp Feed
Yellow––––––––––––––––994–––––distributor Vac Control Valve
These diagrams are also 75+ but the same rules apply, most years are similar with the exception of the breakerless ignition. The connector diagrams are really helpful when used with the above chart.
Color–––––––––––––––Circuit #–––––Description
Blue-yellow––––––––––––1–––––horn Switch To Horn Relay
White-lt Blue Stripe–––––2–––––rh Front Turn Signal Lamp
Lt Green-white Stripe––––3–––––lh Front Turn Signal Lamp
White-black Stripe––––––4–––––electric Choke To Alternator "S" Term
Yellow-lt Green Hash–––––6–––––horn Relay To Horn
Orange-yellow Stripe–––––8–––––turn Signal Flasher Feed
Lt Green-black Stripe––––12–––––headlamp Dimmer Switch To High Beams
Red-black Stripe––––––––13–––––headlamp Dimmer Switch To Low Beams
Red-yellow Stripe–––––––15–––––headlamp Switch To Headlamp Dimmer Switch
Red-lt Green Stripe–––––16–––––ignition Switch To Ignition Coil Batt. Term.
Lt Blue-red Stripe––––––19–––––instrument Panel Lamps Feed
Yellow––––––––––––––––21–––––ignition Sw Main Power
Black-orange––––––––––25–––––power Feed To Headlamp Switch
Black-red–––––––––––––26–––––alternator Ground At Voltage Reg
Black-white–––––––––––28–––––windshield Wiper Sw. To Windshield Wiper Motor
Yellow-white Stripe–––––29–––––fuel Gage To Aux Tank Fuel Gage Sender
Black-green–––––––––––30–––––constant Voltage Unit And Indicator Lamps Feed
White-red Stripe–––––––31–––––oil Pressure Indicator To Oil Pressure Sending Unit
Red-lt Blue Stripe–––––––32–––––starter Control
Yellow––––––––––––––––33–––––starter Solenoid To Horn Relay
Orange–––––––––––––––35–––––alternator Regulator "f" Term. To Alternator
Black-yellow–––––––––––37–––––ammeter To Fusebox, Alternator Output To Main Power In
Black-red–––––––––––––38–––––starter Solenoid To Ammeter
Red-white Stripe–––––––39–––––temp. Gage To Temp. Sending Unit
Lt Blue-white Stripe–––––40–––––cigar Lighter Feed
Lt Blue––––––––––––––––44–––––turn Signal Flasher To Turn Signal Switch
White-blue––––––––––––49–––––right Hand Turn Signal Indicator
Green-white–––––––––––50–––––left Hand Turn Signal Indicator
Black-lt Blue Stripe–––––53–––––courtesy Lamp Switch To Courtesy Lamp
Lt Green-yellow Stripe–––54–––––interior Lamp Switch Feed
Dk Blue–––––––––––––––56–––––windshield Wiper Sw. To Windshield Wiper Motor
Black–––––––––––––––––57–––––ground Circuit
White-orange––––––––––58–––––windshield Wiper Sw. To Windshield Wiper Motor
Black-white–––––––––––60–––––constant Voltage Unit To Gage
Red––––––––––––––––––63–––––windshield Wiper Sw. To Windshield Wiper Motor
Yellow-black Hash––––––137–––––radio Antenna Switch Feed
Black-red–––––––––––––140–––––back-up Lamp
Yellow––––––––––––––––152–––––voltage Regulator Feed
Green-yellow––––––––––232–––––coil To Breakerless Ign Module
Brown––––––––––––––––262–––––starting Motor Relay To Ign. Coil "1" Term.
Dk Green–––––––––––––282–––––turn Signal Sw. To Rh Rear Turn Signal Lamp
Yellow-black Stripe–––––283–––––turn Signal Sw. To Lh Rear Turn Signal Lamp
Red––––––––––––––––––284–––––headlamp Sw To Stoplight Sw
Brown––––––––––––––––285–––––headlamp Sw To Exterior Lights
Orange–––––––––––––––286–––––main Fuel Sender To Fuel Gauge
Red––––––––––––––––––296–––––horn Speed Sensor Switch (ny Only)
Black-lt Green Hash–––––297–––––accy. Feed From Ignition Switch
Red-white Hash––––––––383–––––emergency Warning Flasher Feed
White-red Hash––––––––385–––––flasher To Emergency Warning Switch
Brown––––––––––––––––399–––––heater Blower Switch Feed
Yellow––––––––––––––––460–––––country Horn (ny Only)
Yellow-green––––––––––461–––––city Horn (ny Only)
Blue-yellow––––––––––––482–––––horn Speed Sensor Override Switch (ny Only)
Green–––––––––––––––––614–––––horn Speed Sensor Switch To Speed Cable Sensor (ny Only)
Red-yellow Hash––––––––640–––––distributor Modulator Feed
Black-green––––––––––––733–––––distributor To Breakerless Ign Module
Orange-yellow––––––––––734–––––distributor To Breakerless Ign Module
Purple-blue––––––––––––735–––––distributor To Breakerless Ign Module
Orange-white––––––––––763–––––wiper Power Feed
Red-black–––––––––––––810–––––stoplamp Sw. To Turn Signal Switch
Lt Green-red Stripe–––––904–––––Ign. Sw. To Alt. Reg. (ign. Term.)
Blue––––––––––––––––––932–––––carburetor Throttle Solenoid
White-black Stripe––––––950–––––washer Control Switch Feed
Green-black–––––––––––951–––––washer Pump Motor Feed
Purple-white Stripe–––––977–––––brake Warning Switch To Indicator Lamp
Brown––––––––––––––––984–––––marker Lamp Feed
Yellow––––––––––––––––994–––––distributor Vac Control Valve
These diagrams are also 75+ but the same rules apply, most years are similar with the exception of the breakerless ignition. The connector diagrams are really helpful when used with the above chart.
