Ford F-100–F-350 & Bronco Cruise Control Wiring Diagram – Speed Control 37-01-6

This is page 37-01-6 from a Ford factory service manual section covering the Speed Control (cruise control) System. It presents FIG. 7, the Main Wiring Diagram applicable to F-100 through F-350 trucks and the Bronco. The diagram traces the cruise control circuit from a 20-amp accessory fuse in the fuse panel through circuit 297 BK-GR to the speed control switch, which has four positions (1. OFF, 2. ON, 3. SET, 4. COAST) and shares wiring with the horn switch (circuit 57 BK to ground). Circuit 151 BL-BK runs through connector C-305 to the speed control amplifier via connector C-717. The amplifier connects to the speed cable sensor through connectors C-720 and C-721 using circuits 614 GR and 57 BK, and grounds through 57 BK at C-703. Output circuits 826 W-PK, 825 GY-BK, 734 O-Y, 828 BR-GR, 827 Y-R, and 735 P-BL pass through connectors C-714, C-716, and C-715 to the throttle actuator (servo assembly). Other identified circuits include 810 O-BK/R-BK and 1 BL-Y. Diagram reference number L2192-2E appears at lower right. Readers can learn wire colors, circuit numbers, connector identifications, and fuse rating for diagnosing factory cruise control on these trucks.