1986 Ford Bronco Speed Control (Cruise) Wiring Diagram - Servo & Amplifier

This is a photographed page from a Ford wiring diagram manual (EVTM-style) showing the speed control (cruise control) system schematic, filed by the uploader for a 1986 Ford Bronco. The diagram traces power from a hot-at-all-times fuse through the hazard flasher and stop lamp switch (closed with brake depressed) on circuit 511 LG, with branches for manual transmissions through a clutch switch (open with clutch depressed). The main components shown are the speed control servo, containing a regulating valve that controls vacuum applied to the servo motor and an actuator connecting to the throttle linkage, a vacuum dump valve that vents to atmosphere when the brake is depressed, the speedometer cable and speed sensor, and the solid-state speed control amplifier. Wire circuits between the servo and amplifier include 140 GY/BK, 144 O/Y, 146 W/PK, 143 RD/LG, 147 P/LB, and 150 Y/R, with ground on circuit 57 BK. Connector pinout illustrations for the speed control amplifier and servo are shown at the right and bottom of the page. A column of system-operation text on the right edge (describing SET/ACCEL and COAST functions) is largely cut off and illegible in this scan.