What fuses and amperages are shown in the F-Series fuse box diagram?

The fuse box shows INST LT 3A, FUEL TANK/SEAT BELT 15A, THROTTLE SOL 7.5A, CTSY/CIG 15, HEATER, RADIO 7.5A, B/U WIPER 15, DIRECT. 20A, ACC. 15, and HAZ/STOP LT. 20A.

What circuits does section two (Fig. 87) of the diagram cover?

Section two covers the headlights, park and marker lights, horn relay, beam select switch, battery, fusible link, starter relay and starter, ignition module, distributor, ignition coil, back-up light switch, neutral/clutch safety switch, windshield wiper and washer motors, wiper switch, and the alternator with its regulator.

What is the fuse rating for the back-up light and washer circuits?

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

What terminals are shown on the alternator regulator?

The alternator regulator connector shows terminals labeled I, S, F, and A+.

What wire colors feed the blower motor resistor?

The blower motor resistor (terminals H, M, L) is fed by RED/BLK, BLU/RED, and BLK/YEL wires, with the blower motor grounded via BLK/YEL.

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1970-78 Ford F-Series Chassis Wiring Diagram - Fuse Box, Lights & 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 February 2008 · Photo 938 of 1632

This scanned page (page 6-30, 'Chassis Electrical') from an automotive service manual contains two full-page chassis wiring diagrams for Ford F-Series trucks, labeled Fig. 86 and Fig. 87 (sections one and two, approximately 1970-78 F-Series). Section one covers the fuse box (with fuse positions and amperages such as INST LT 3A, FUEL TANK/SEAT BELT 15A, RADIO 7.5A, DIRECT. 20A, HAZ/STOP LT 20A), hazard and directional flashers, stop light switch, ignition switch, light switch, directional switch, instrument panel printed circuit connector, blower motor with resistor and switch, oil pressure and coolant temperature switches, and rear lighting (tail, direction, back-up, license, and marker lights) with wire color codes. Section two covers front lighting (headlights, park lights, marker lights, direction lights), horn relay, beam select switch, battery, fusible link, starter relay and starter, ignition module, distributor, ignition coil, noise filter, back-up light and washer fuses (15A each), neutral/clutch safety switch, windshield wiper motor and switch, washer motor, alternator and alternator regulator. Wire colors (e.g., RED/GRN, BLK/YEL, WHT/BLU) are marked along each circuit, making the page useful for tracing chassis electrical circuits and diagnosing lighting, charging, starting, and wiper faults.

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Frequently asked questions

What fuses and amperages are shown in the F-Series fuse box diagram?: The fuse box shows INST LT 3A, FUEL TANK/SEAT BELT 15A, THROTTLE SOL 7.5A, CTSY/CIG 15, HEATER, RADIO 7.5A, B/U WIPER 15, DIRECT. 20A, ACC. 15, and HAZ/STOP LT. 20A.
What circuits does section two (Fig. 87) of the diagram cover?: Section two covers the headlights, park and marker lights, horn relay, beam select switch, battery, fusible link, starter relay and starter, ignition module, distributor, ignition coil, back-up light switch, neutral/clutch safety switch, windshield wiper and washer motors, wiper switch, and the alternator with its regulator.
What is the fuse rating for the back-up light and washer circuits?: The diagram shows a 15A back-up light fuse and a 15A back-up/washer fuse.
What terminals are shown on the alternator regulator?: The alternator regulator connector shows terminals labeled I, S, F, and A+.
What wire colors feed the blower motor resistor?: The blower motor resistor (terminals H, M, L) is fed by RED/BLK, BLU/RED, and BLK/YEL wires, with the blower motor grounded via BLK/YEL.