What years and models do these wiring diagrams cover?

The figure captions state they are for 1976-78 Ford F-Series trucks: Fig. 86 is 'section one' and Fig. 87 is 'section two' of the chassis electrical diagram.

What fuses and amp ratings are shown in the fuse box?

The fuse box in section one shows: INST LT 3A, HEATER 35A, FUEL TANK 15A, RADIO 75A (likely 7.5A), SEAT BELT 75A (likely 7.5A), B/U/WIPER 15, THROTTLE SOL., ACC. 20A, DIRECT. 15, CTSY/CIG. 15, and HAZ/STOP LT. 20A.

What size is the back-up light fuse?

The diagram shows a 15A back-up light fuse and a 15A back-up/washer fuse in section two.

What wire colors go to the blower switch?

The blower switch is shown with RED/BLK, BLU/RED, and BLK/YEL wires; the blower motor feed is BLK/YEL through the H-M-L blower motor resistor.

What terminals are shown on the alternator regulator?

The alternator regulator is drawn with terminals A+, S, F, and I, connected via YEL, ORN, WHT/BLK and BLK/RED wiring to the alternator, with a RED/GRN wire to the ignition switch side.

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1976-78 Ford F-Series Chassis Wiring Diagram - Dash, Fuse Box & Engine Circuits

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 September 2008 · Photo 1217 of 1632

This scanned page (page 6-30, 'Chassis Electrical') from an automotive repair manual contains two chassis wiring diagrams for 1976–78 Ford F-Series trucks: Fig. 86 'section one' (diagram 85766101) and Fig. 87 'section two' (diagram 85766102). Section one covers the interior/dash side of the harness: blower motor, blower resistor and switch, coolant temperature and oil pressure switches, instrument panel printed circuit connector (with its wire color list), hazard flasher, stop light switch, light switch, low brake switch, ignition switch, directional switch and flasher, marker/tail/back-up/direction lights, and the fuse box with individual fuse positions and amperages (INST LT 3A, HEATER 35A, FUEL TANK 15A, RADIO 7.5A, SEAT BELT, THROTTLE SOL., B/U/WIPER 15, ACC. 20A, DIRECT. 15, CTSY/CIG. 15, HAZ/STOP LT. 20A). Section two covers the engine compartment and lighting side: battery, starter relay, starter, alternator and regulator (A+, S, F, I terminals), fusible link, headlights and beam select switch, horn relay and horns, washer motor, windshield wiper motor and switch, 15A back-up/washer and back-up light fuses, back-up light 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 and diagnosing electrical faults.

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Frequently asked questions

What years and models do these wiring diagrams cover?: The figure captions state they are for 1976-78 Ford F-Series trucks: Fig. 86 is 'section one' and Fig. 87 is 'section two' of the chassis electrical diagram.
What fuses and amp ratings are shown in the fuse box?: The fuse box in section one shows: INST LT 3A, HEATER 35A, FUEL TANK 15A, RADIO 75A (likely 7.5A), SEAT BELT 75A (likely 7.5A), B/U/WIPER 15, THROTTLE SOL., ACC. 20A, DIRECT. 15, CTSY/CIG. 15, and HAZ/STOP LT. 20A.
What size is the back-up light fuse?: The diagram shows a 15A back-up light fuse and a 15A back-up/washer fuse in section two.
What wire colors go to the blower switch?: The blower switch is shown with RED/BLK, BLU/RED, and BLK/YEL wires; the blower motor feed is BLK/YEL through the H-M-L blower motor resistor.
What terminals are shown on the alternator regulator?: The alternator regulator is drawn with terminals A+, S, F, and I, connected via YEL, ORN, WHT/BLK and BLK/RED wiring to the alternator, with a RED/GRN wire to the ignition switch side.