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1985 Ford F-Series & Bronco Wiring Diagram - EEC, Lighting, Alternator (Fig 109)

Manual wiring diagram of the 1985 Ford F-Series/Bronco engine and charging circuits with color-coded wires.

AI caption · Photo 675 of 706

This is a scanned page (6-70, Chassis Electrical) from an automotive service manual showing Figure 109, a wiring diagram labeled '1985 F-Series pick-up and Bronco, section two.' The schematic covers the front lighting and engine-control wiring: battery, starter and starter relay, alternator (with F/S/B terminals) and alternator regulator, fusible link, right and left headlights, marker lights, park/direction lights, beam select (lo/hi) switch, horns, carb solenoid, throttle actuator, EEC power relay, EGR control/vent solenoids, by-pass and diverter solenoids, coolant temperature sensor, carburetor stepper motor, EGR position sensor, ignition coil with noise filter, feed-back solenoid, distributor/ignition module, throttle position sensor, MAP sensor, and the Engine Control Module connector. Wire color codes are given throughout (e.g., RED/GRN to the alternator regulator, GRN/BLK to the high beam indicator, TAN/BLU and TAN/RED to the carburetor stepper motor, ORN/WHT and BLK/WHT to the throttle position sensor). Cross-references indicate connections to the ignition switch, light switch, ammeter, warning indicator, tachometer, headlight switch, and marker light relay. Useful for tracing feedback-carbureted EEC and lighting circuits on 1985 Ford F-Series trucks and Broncos.

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Frequently asked questions

What vehicles does this wiring diagram cover?
The caption states 'Fig. 109 1985 F-Series pick-up and Bronco, section two,' so it covers 1985 Ford F-Series pickups and Broncos.
What wire colors go to the throttle position sensor?
The diagram shows ORN/WHT and BLK/WHT wires at the throttle position sensor.
What color wire runs to the high beam indicator?
A GRN/BLK wire from the beam select switch circuit goes to the high beam indicator.
What components connect to the Engine Control Module in this diagram?
Wires from the EEC power relay, EGR control/vent solenoids, by-pass and diverter solenoids, coolant temp sensor, carburetor stepper motor, EGR position sensor, ignition coil, feed-back solenoid, distributor/ignition module, throttle position sensor, and MAP sensor route to the Engine Control Module connector.
What wire colors are at the carburetor stepper motor?
TAN/BLU, TAN/Lt.BLU, TAN/RED, and BLK/WHT wires are shown at the carburetor stepper motor.

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