What vehicles do these wiring diagrams cover?

The figure captions identify them as Fig. 86 and Fig. 87 for 1978-79 F-Series trucks, sections one and two of the chassis electrical wiring diagram.

What fuse ratings are shown in the fuse box?

Visible fuse positions include INST LT 3A, FUEL TANK 15A, CTSY/CIG 15, RADIO 7.5A, DIRECT. 20A, ACC. 15, HAZ/STOP LT 20A, plus a 15A back-up light fuse and a 15A back-up/washer fuse shown in section two.

What wire colors go to the starter relay?

The starter relay shows BLK/YEL, BLK/RED, BLK, BRN, RED/GRN, and RED/BLU wires, with a fusible link called out near the battery feed (RED).

Which diagram covers the headlights and alternator?

Fig. 87 (section two, diagram 85766102) covers the left and right headlights, park/marker/direction lights, beam select switch, horn relay, battery, starter relay, ignition module, distributor, wiper system, alternator, and alternator regulator.

What components connect to the blower circuit?

Section one shows the blower motor (BLK/YEL), blower motor resistor with H, M, L terminals (RED/BLK, BLU/RED, BLU/YEL), and the blower switch connected via GRN, BLK/RED, and BLK wires.

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1978-79 Ford F-Series Chassis Wiring Diagram - Fuse Box, Lighting & Charging

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

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Scanned chassis-electrical manual page with two 1976-78 Ford F-Series wiring diagrams showing harness routing and connectors.

AI caption January 2008 · Photo 826 of 1632

This is a scanned page (page 6-30, 'Chassis Electrical') from a repair manual showing two chassis wiring diagrams for 1978-79 Ford F-Series trucks. Figure 86 (diagram 85766101), 'section one,' covers the fuse box (with fuse positions such as INST LT 3A, FUEL TANK 15A, CTSY/CIG 15, DIRECT. 20A, HAZ/STOP LT 20A), hazard and directional flashers, stop light switch, directional switch, ignition switch, low brake switch, light switch, instrument panel printed circuit connector, blower motor, blower motor resistor and blower switch, oil pressure and coolant temperature switches, and rear lighting (tail, back-up, license, marker, and direction lights) with wire color codes. Figure 87 (diagram 85766102), 'section two,' covers the front lighting and charging/ignition systems: headlights, park and direction lights, marker lights, beam select switch, horn relay, battery, fusible link, starter relay and starter, ignition module, distributor, ignition coil and noise filter, back-up light switch and 15A fuses, neutral/clutch safety switch, windshield wiper motor and switch, washer motor, alternator, and alternator regulator. Wire colors (e.g., BLK/YEL, RED/GRN, WHT/BLU) are labeled throughout. A reader can trace circuit paths and wire colors for lighting, ignition, charging, and wiper systems on these trucks.

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Frequently asked questions

What vehicles do these wiring diagrams cover?: The figure captions identify them as Fig. 86 and Fig. 87 for 1978-79 F-Series trucks, sections one and two of the chassis electrical wiring diagram.
What fuse ratings are shown in the fuse box?: Visible fuse positions include INST LT 3A, FUEL TANK 15A, CTSY/CIG 15, RADIO 7.5A, DIRECT. 20A, ACC. 15, HAZ/STOP LT 20A, plus a 15A back-up light fuse and a 15A back-up/washer fuse shown in section two.
What wire colors go to the starter relay?: The starter relay shows BLK/YEL, BLK/RED, BLK, BRN, RED/GRN, and RED/BLU wires, with a fusible link called out near the battery feed (RED).
Which diagram covers the headlights and alternator?: Fig. 87 (section two, diagram 85766102) covers the left and right headlights, park/marker/direction lights, beam select switch, horn relay, battery, starter relay, ignition module, distributor, wiper system, alternator, and alternator regulator.
What components connect to the blower circuit?: Section one shows the blower motor (BLK/YEL), blower motor resistor with H, M, L terminals (RED/BLK, BLU/RED, BLU/YEL), and the blower switch connected via GRN, BLK/RED, and BLK wires.