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'73-74 Bronco Interior Lights Headlights Horn Cigar Lighter
IF THE IMAGE IS TOO SMALL, click it.

NOTE that C233 is partially shown (for clarity) on this page in circuit 285 Br, and again on the next page completely. This will create a slight mismatch if the pages are combined in a strip.

Repair Locations Grid:


Improved, corrected, & combined versions of Seabiscuit's colorized diagrams. Connector faces, component locations, and technical oversight provided by Viperwolf1. When printed at full scale, the diagrams can be combined into a continuous strip.

Before printing, click the image to make sure you have the largest version.

See also:

. . .
. . .

https://www.fleet.ford.com/truckbbas/non-html/1997/c37_39_p.pdf

Index '73-74 Bronco Wiring
--------------------------------------------------
Components
Alternator . . . . . . . A1-B1
Alternator Voltage Regulator . J1-K1
AM Radio . . . . . . . . D16
Ambient Switch . . . . . . E7
Ammeter . . . . . . . . B4
Auxilliary Fuel Tank Sender . J12
Backup Lamp, LHR . . . . . K15
Backup Lamp, RHR . . . . . K16
Backup Lamp Switch . . . . E14, F4
Ballast Resistor . . . . . E4
Battery . . . . . . . . D3-E3
Beam Select Switch . . . . D20
Blinker Switch . . . . . . E29-E30
Block Heater . . . . . . K32
Blower Motor . . . . . . G38
Blower Motor Resistor . . . D38
Blower Motor Switch . . . . C38
Brake Lamp, LHR . . . . . G33
Brake Lamp, RHR . . . . . G35
Brake Lamp Switch . . . . . C29
Brake Warning Lamp . . . . F6
Brake Warning Switch . . . . J6
Breakerless Ignition Module . K3
Capacitor, Noise Suppression . E2
Carburetor Valve . . . . . J5
Cigar Lighter . . . . . . E22
Coil . . . . . . . . . H4-J4
Constant Voltage Unit . . . C9
Coolant Temperature Gauge . . F8
Coolant Temperature Sender . . K8
CV Unit . . . . . . . . C9
Distributor . . . . . . . G3-K3
Dome Lamp . . . . . . . D17
Dual Brake Warning Switch . . J6
Emergency Signal Flasher . . E32
Emergency Signal Switch . . . G32
Emission Control Solenoid . . J5, G7
Engine Block Heater . . . . K32
Flasher, Emergency Signal . . E32
Flasher, Turn Signal . . . . C32
Front Fuel Sender . . . . . J12
Fuel Gauge . . . . . . . C10
Fuel Sender . . . . . . . J10, J12
Fuel Tank Selector Switch . . E11
Fuse 1 (20A) Blower . . . . A38
Fuse 2 (15A) Turn Wash Radio . B15
Fuse 3 (2A) Illumination . . B18
Fuse 4 (15A) Cigar Crtsy Rev . B23
Fuse 5 (20A) Hazards . . . . B32
Fuse Inline (7.5A) TRS Switch . C7
Fusible Link . . . . . . C3
Gauge, Ammeter . . . . . . B4
Gauge, Fuel . . . . . . . C10
Gauge, Oil Pressure . . . . F9
Gauge, Temperature . . . . F8
Generator . . . . . . . A1-B1
Hazard Signal Flasher . . . E32
Hazard Signal Switch . . . . G32
Headlamp, Left . . . . . . H19
Headlamp, Right . . . . . H20
Headlamp Dimmer Switch . . . D20
Headlamp Switch . . . . . C21-C22
Headlamp Switch Lamp . . . . J18
Heater, Block Immersion . . . K32
Heater Blower Switch . . . . C38
Heater Blower Motor . . . . G38
Heater Blower Resistor . . . D38
Heater Control Lamp . . . . E17
High-Altitude Solenoid Valve . J5
High-Beam Switch . . . . . D20
High-Beam Indicator Lamp . . G20
Horn . . . . . . . . . E18
Horn Switch . . . . . . . D19
ICVR . . . . . . . . . C9
Ignition Coil . . . . . . H4-J4
Ignition Module . . . . . K3
Ignition Resistor . . . . . E4
Ignition Switch . . . . . C6-D6
Immersion Heater . . . . . K32
Indicator Lamp, Brake Warning . F6
Indicator Lamp, L Turn . . . H29
Indicator Lamp, High-Beam . . G20
Indicator Lamp, R Turn . . . H30
Inline Fuse (7.5A) TRS Switch . C7
Instrument Cluster Lamp . . . H18
Instrument Cluster Voltage Reg. C9
Key Switch . . . . . . . C6-D6
Lamp, Backup, LHR . . . . . K15
Lamp, Backup, RHR . . . . . J16
Lamp, Brake, LHR . . . . . G33
Lamp, Brake, RHR . . . . . G35
Lamp, Brake Warning Indicator . F6
Lamp, Dome . . . . . . . D17
Lamp, Head, Left . . . . . H19
Lamp, Head, Right . . . . . H20
Lamp, Headlamp Switch . . . J18
Lamp, Heater Control . . . . E17
Lamp, High-Beam Indicator . . G20
Lamp, Instrument Cluster . . H18
Lamp, Left Turn Indicator . . H29
Lamp, License . . . . . . G37
Lamp, Map . . . . . . . C17
Lamp, Park, LHF . . . . . J22
Lamp, Park, LHR . . . . . G33
Lamp, Park, RHF . . . . . F22
Lamp, Park, RHR . . . . . G35
Lamp, PRNDL Illumination . . G18
Lamp, Reverse, LHR . . . . K15
Lamp, Reverse, RHR . . . . K16
Lamp, Right Turn Indicator . . H30
Lamp, Shifter Illumination . . G18
Lamp, Side Marker, LHF . . . K22
Lamp, Side Marker, LHR . . . G34
Lamp, Side Marker, RHF . . . H22
Lamp, Side Marker, RHR . . . G36
Lamp, Stop, LHR . . . . . G33
Lamp, Stop, RHR . . . . . G35
Lamp, Turn, LHF . . . . . J22
Lamp, Turn, LHR . . . . . G33
Lamp, Turn, RHF . . . . . F22
Lamp, Turn, RHR . . . . . G35
Lamp, Wiper Switch . . . . J18
License Lamp . . . . . . G37
Lighter Socket . . . . . . E22
Loop Ammeter . . . . . . B4
Main Fuel Tank Sender. . . . J10
Map Lamp . . . . . . . . C17
Marker Lamp, LHF Side . . . K22
Marker Lamp, LHR Side . . . G34
Marker Lamp, RHF Side . . . H22
Marker Lamp, RHR Side . . . G36
Module, Breakerless Ignition . K3
Motor, Heater Blower . . . . G38
Motor, Starter . . . . . . H3-J4
Motor, Windshield Wiper . . . J13
Motor, Washer Pump . . . . K13
Neutral Safety Switch . . . F4
Oil Pressure Gauge . . . . F9
Oil Pressure Sender . . . . K9
Park Lamp, LHF . . . . . . J22
Park Lamp, LHR . . . . . . G33
Park Lamp, RHF . . . . . . F22
Park Lamp, RHR . . . . . . G35
Park Neutral Position Switch . F4
Power Point . . . . . . . E22
PRNDL Illumination Lamp . . . G18
Radio . . . . . . . . . D16
Radio Capacitor . . . . . E2
Radio Speaker . . . . . . F15
Rear Fuel Sender . . . . . J10
Relay, Horn . . . . . . . F11
Relay, Starter . . . . . . D3
Resistor, Ignition Ballast . . E4
Resistor, Blower Motor . . . D38
Reverse Lamp, LHR . . . . . K15
Reverse Lamp, RHR . . . . . K16
Reverse Lamp Switch . . . . E14, F4
Sender, Fuel, Front . . . . J12
Sender, Fuel, Rear . . . . J10
Sender, Oil Pressure . . . . K9
Sender, Temperature . . . . K8
Shifter Illumination Lamp . . G18
Side Marker Lamp, LHF . . . K22
Side Marker Lamp, LHR . . . G34
Side Marker Lamp, RHF . . . H22
Side Marker Lamp, RHR . . . G36
Solenoid, Carburetor Emission . J5, G7
Solenoid, Vacuum Valve . . . G7
Speaker . . . . . . . . F15
Starter Motor . . . . . . H3-J4
Starter Relay . . . . . . D3
Stop Lamp, LHR . . . . . . G33
Stop Lamp, RHR . . . . . . G35
Stop Lamp Switch . . . . . C29
Switch, Ambient . . . . . E7
Switch, Backup Lamp . . . . E14, F4
Switch, Blinker . . . . . E29-E30
Switch, Blower Motor . . . . C38
Switch, Brake Lamp . . . . C29
Switch, Dual Brake Warning . . J6
Switch, Emergency Signal . . G32
Switch, Fuel Tank Selector . . E11
Switch, Hazard Signal . . . G32
Switch, Headlamp . . . . . C21-C22
Switch, Heater Blower . . . C38
Switch, High-Beam Dimmer . . D20
Switch, Horn . . . . . . D19
Switch, Ignition . . . . . C6-D6
Switch, Neutral Safety (PNP) . F4
Switch, Reverse Lamp . . . . E14, F4
Switch, Stop Lamp . . . . . C29
Switch, TRS . . . . . . . J7
Switch, Turn Signal . . . . E29-E30
Switch, Windshield Washer . . B13
Switch, Windshield Wiper . . B13
Temperature Gauge . . . . . F8
Temperature Sender . . . . K8
TRS Switch . . . . . . . J7
Turn Signal, LHF . . . . . J22
Turn Signal, LHR . . . . . G33
Turn Signal Flasher . . . . C32
Turn Signal Indicator, L . . E22
Turn Signal Indicator, R . . E23
Turn Signal, RHF . . . . . F22
Turn Signal, RHR . . . . . G35
Turn Signal Switch . . . . E29-E30
Vacuum Valve Solenoid . . . G7
Valve, Carburetor Solenoid . . C9
Voltage Regulator, Alternator . J1-K1
Voltage Regulator, Instruments C9
Water Temperature Gauge . . . F8
Water Temperature Sender . . K8
Windshield Washer Switch . . B13
Windshield Washer Pump Motor . K13
Windshield Wiper Motor . . . J13
Windshield Wiper Switch . . B13
Windshield Wiper Switch Lamp . J18
--------------------------------------------------
Connectors
C201 (Alternator) . . . . . A1-B2
C202 (Voltage Regulator) . . E1
C203 (Radio Capacitor) . . . D2
C205 (Ammeter) . . . . . . B4
C206 (Inline) . . . . . . A3
C207 (Battery ) . . . . . C3
C208 (Battery -) . . . . . E3
C209 (Distributor Cap) . . . G3, J3
C210 (Distributor) . . . . H3, K3
C211 (Starter Relay Battery) . C3
C212 (Starter Relay Starter) . D3
C213 (Starter Relay S) . . . D3
C214 (Starter Relay I) . . . D4
C215 (Ignition Coil) . . . . H4
C216 (Ignition Coil) . . . . H4
C217 (Ignition Coil) . . . . J4
C218 (Inline) . . . . . . F4, H8-H9
C219 (Ambient Switch) . . . E7
C220 (Inline) . . . . . . F7
C221 (Vacuum Valve Solenoid) . G7
C222 (Inline, NSS) . . . . E3-E4, E15
C223 (ICVR) . . . . . . . B9
C224 (ICVR) . . . . . . . B9
C225 (Temp Gauge) . . . . . E8
C226 (Temp Gauge) . . . . . G8
C227 (Temp Sender) . . . . J8
C228 (Oil Gauge) . . . . . E9
C229 (Oil Gauge) . . . . . G9
C230 (Oil Sender) . . . . . J9
C231 (Fuel Gauge) . . . . . B10
C232 (Fuel Gauge) . . . . . D10, G10
C233 (Inline) . . . . . . D23, D30-D31, H10
C234 (Rear Fuel Sender) . . . J10
C235 (Tank Select Switch) . . D11
C236 (Tank Select Switch) . . F11
C237 (Tank Select Switch) . . F11
C238 (Inline) . . . . . . H11
C239 (Front Fuel Sender) . . J11
C240 (Ignition Switch) . . . C6
C241 (Ignition Switch) . . . C6
C242 (Ignition Switch) . . . D6
C243 (Inline) . . . . . . G6, G15
C244 (TRS Switch) . . . . . J7
C245 (Starter) . . . . . . K2
C301 (Wiper Switch) . . . . C13
C302 (Inline) . . . . . . E13
C303 (Inline) . . . . . . F13
C304 (Wiper Motor) . . . . H13
C305 (Washer Pump) . . . . K14
C307 (Brake Warning Switch) . J6
C308 (L Backup Lamp) . . . . J15
C309 (R Backup Lamp) . . . . J16
C310 (Backup Switch) . . . . E15
C311 (H/L & Wiper Ill.) . . . J17
C312 (Heater Ill.) . . . . F17
C313 (Inline) . . . . . . B17
C314 (Dome Lamp) . . . . . D17
C315 (Map Lamp) . . . . . A17
C316 (Horn) . . . . . . . E18
C317 (Inline) . . . . . . G5
C318 (Carb Solenoid) . . . . H5
C319 (Speaker) . . . . . . E16
C320 (Inline) . . . . . . H15, C33-C37
C321 (Turn Signal Switch) . . D18, F29-F30
C322 (Radio) . . . . . . C16
C401 (Headlamp Dimmer Switch) . E20
C402 (L Headlamp) . . . . . H19
C403 (R Headlamp) . . . . . H20
C404 (RHF Marker) . . . . . H21
C405 (RHF Turn) . . . . . F22
C406 (LHF Marker) . . . . . K21
C407 (LHF Turn) . . . . . J22
C408 (Headlamp Switch) . . . B21-C22
C409 (Hazard Switch) . . . . G32
C410 (A/C Outlet) . . . . . J32
C411 (Turn Flasher) . . . . C32
C412 (Hazard Flasher) . . . E32
C413 (Cigar Lighter) . . . . D22
C414 (Block Heater) . . . . J32
C415 (Brake Switch) . . . . C29
C501 (L Taillamp) . . . . . F33
C502 (LHR Marker) . . . . . F34
C503 (R Taillamp) . . . . . F35
C504 (RHR Marker) . . . . . F36
C505 (License Lamp) . . . . F37
C506 (Blower Switch) . . . . C38
C507 (Blower Switch) . . . . C38
C508 (Blower Resistor) . . . D38
C509 (Blower Motor) . . . . E38
--------------------------------------------------
Grounds
G201 (Voltage Regulator) . . H1
G202 (Block) . . . . . . E3
G204 (Rear Fuel Tank) . . . K10
G205 (Front Fuel Tank) . . . K11
G206 (L Valve Cover) . . . . K7
G301 (Instrument Panel) . . . K17
G302 (W/S Frame) . . . . . K17
G303 (Wiper Motor) . . . . K13
G401 (L Core Support) . . . K19, K22
G402 (R Core Support) . . . K21, G22
G501 (LHR Side Marker) . . . K34
G502 (RHR Side Marker) . . . K36
G503 (L T/G) . . . . . . K37
G504 (Blower Case) . . . . K38
--------------------------------------------------
Splices
S201 (Starter Relay) . . . . C2
S202 (Ignition Switch) . . . A5-A15
S203 (Ignition Switch) . . . E5
S204 (Ignition Switch) . . . A4-A21
S205 (Ignition Switch) . . . E7
S301 (Steering Column) . . . G18
S302 (Headlamp Switch) . . . C15
S401 (Headlamp Dimmer Switch) . E20
S402 (Headlamp Dimmer Switch) . F20