What years and models does this wiring diagram cover?

The figure captions state it covers 1976-78 Ford F-Series trucks (Fig. 86 section one and Fig. 87 section two, Chassis Electrical page 6-30).

What fuses and amperages are shown in the fuse box?

INST LT 3A, HEATER 35A, FUEL TANK 15A, RADIO 75A (likely 7.5A), SEAT BELT 75A (likely 7.5A), B/U/WIPER 15, ACC. 20A, DIRECT. 15, CTSY/CIG. 15, HAZ/STOP LT. 20A, plus a THROTTLE SOL. position. Section two also shows a 15A back-up/washer fuse and a 15A back-up light fuse.

What wire colors run to the blower switch?

The blower switch shows RED/BLK, BLU/RED, and BLK/YEL wires; the blower motor itself is fed by a BLK/YEL wire through the blower motor resistor (H M L terminals).

What wire color goes from the ignition coil to the distributor circuit?

The ignition coil shows RED/GRN and GRN/YEL wires (GRN/YEL through a noise filter), and the distributor shows BLK/GRN and RED/BLU wires connecting toward the ignition module.

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1976-78 Ford F-Series Wiring Diagram - Chassis Electrical, Fuse Box & Ignition

Scanned 1976-78 F-Series chassis electrical wiring diagram manual page

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Scanned chassis-electrical manual page with 1976-78 Ford F-Series body wiring diagrams showing circuits, switches, and connectors.

AI caption January 2008 · Photo 825 of 1632

This is a two-page scan (page 6-30, 'Chassis Electrical') from a repair manual showing complete chassis wiring diagrams labeled Fig. 86 and Fig. 87 for 1976-78 Ford F-Series trucks. Section one (diagram 85766101) covers the interior/lighting circuits: blower motor and resistor, blower switch, coolant temperature and oil pressure switches, instrument panel printed circuit connector pinout with wire colors, light switch, hazard flasher, stop light switch, low brake switch, ignition switch, directional flasher and switch, marker/tail/direction/back-up/license lights, and the fuse box layout with positions and amperages (INST LT 3A, HEATER 35A, FUEL TANK 15A, RADIO 7.5A, SEAT BELT 7.5A, B/U/WIPER 15, ACC. 20A, DIRECT. 15, CTSY/CIG. 15, HAZ/STOP LT. 20A, THROTTLE SOL.). Section two (diagram 85766102) covers the engine/front-end circuits: battery, starter relay, starter, alternator and regulator, fusible link, headlights, beam select switch, horn relay and horns, washer motor, windshield wiper motor and switch, 15A back-up/washer fuse, back-up light fuse and switch, neutral/clutch safety switch, ignition coil, noise filter, distributor, and ignition module. Wire color codes (e.g., BLK/YEL, RED/GRN, PPL/WHT) are labeled throughout, making this useful for tracing circuits on 1976-78 F-Series trucks and closely related vehicles.

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Frequently asked questions

What years and models does this wiring diagram cover?: The figure captions state it covers 1976-78 Ford F-Series trucks (Fig. 86 section one and Fig. 87 section two, Chassis Electrical page 6-30).
What fuses and amperages are shown in the fuse box?: INST LT 3A, HEATER 35A, FUEL TANK 15A, RADIO 75A (likely 7.5A), SEAT BELT 75A (likely 7.5A), B/U/WIPER 15, ACC. 20A, DIRECT. 15, CTSY/CIG. 15, HAZ/STOP LT. 20A, plus a THROTTLE SOL. position. Section two also shows a 15A back-up/washer fuse and a 15A back-up light fuse.
What wire colors run to the blower switch?: The blower switch shows RED/BLK, BLU/RED, and BLK/YEL wires; the blower motor itself is fed by a BLK/YEL wire through the blower motor resistor (H M L terminals).
What circuits are covered in section two of the diagram?: Section two (Fig. 87) covers the battery, starter relay and starter, alternator and alternator regulator, fusible link, headlights and beam select switch, horn relay and horns, washer motor, windshield wiper motor and switch, back-up light fuse and switch, neutral/clutch safety switch, ignition coil, noise filter, distributor, and ignition module.
What wire color goes from the ignition coil to the distributor circuit?: The ignition coil shows RED/GRN and GRN/YEL wires (GRN/YEL through a noise filter), and the distributor shows BLK/GRN and RED/BLU wires connecting toward the ignition module.