What amperage is the heater/A-C fuse on a 1979 Ford Bronco or F-Series truck?

Fuse 3, which feeds the heater or A/C, is rated 35 A per this diagram.

Which fuse protects the radio in the 1979 Bronco/F100-F350 fuse panel?

Fuse 12, rated 7.5 A, feeds the radio (the diagram cross-references Page 35).

What does Fuse 10 power on the 1979 Bronco/F-Series?

Fuse 10 (20 A) is the accessory relay feed and also supplies the speed control and heated backlight (See Page 46).

Which fuse is used only on F100-F350 trucks and not the Bronco?

Fuse 6 (7.5 A) for the fuel tank selector switch is marked 'F100 F350 Only'.

What fuse covers the back-up lamps and windshield washer pump?

Fuse 11, rated 15 A, feeds the back-up lamps and windshield washer pump (See Page 19).

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1979 Ford Bronco F100-F350 Fuse Panel & Ignition Switch Wiring Diagram

1979 Bronco/F-series ignition switch and fuse panel power-feed wiring schematic

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Wiring schematic (Bronco/F100-350) of the headlight switch, ignition switch and 12-position fuse panel showing circuit feeds to accessories, seat belt, carburetor, backup lamps and warning systems.

AI caption August 2014 · Photo 9 of 48

This page is one sheet from a factory-style wiring diagram set covering the 1979 Ford Bronco and F100 through F350 trucks. It illustrates the headlight switch (HEAD/PARK/DOME positions), the ignition switch with its ACCY/OFF/RUN/START contacts, the engine compartment light with mercury switch, and the interior fuse panel. Each fuse position is labeled with its amperage and circuits served: Fuse 7 (15A) dome/cargo/courtesy/glove box lights and cigar lighter; Fuse 8 (20A) stoplamps and emergency warning flasher; Fuse 2 (3A) interior and instrument panel illumination; Fuse 3 (35A) heater or A/C; Fuse 4 (7.5A) seat belt warning switch; Fuse 5 (7.5A) carburetor solenoid; Fuse 6 (7.5A) fuel tank selector switch (F100–F350 only); Fuse 9 (15A) turn signal flasher; Fuse 10 (20A) accessory relay feed, speed control, heated backlight; Fuse 11 (15A) back-up lamps and windshield washer pump; Fuse 12 (7.5A) radio. Wire colors (e.g., bk/y, gr/y, r/bl) and splice points (S208, S303, S401, S403, S1103) are identified, along with cross-references to other pages of the diagram set and notes distinguishing Bronco-only and with/without-gauges variations.

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Frequently asked questions

What amperage is the heater/A-C fuse on a 1979 Ford Bronco or F-Series truck?: Fuse 3, which feeds the heater or A/C, is rated 35 A per this diagram.
Which fuse protects the radio in the 1979 Bronco/F100-F350 fuse panel?: Fuse 12, rated 7.5 A, feeds the radio (the diagram cross-references Page 35).
What does Fuse 10 power on the 1979 Bronco/F-Series?: Fuse 10 (20 A) is the accessory relay feed and also supplies the speed control and heated backlight (See Page 46).
Which fuse is used only on F100-F350 trucks and not the Bronco?: Fuse 6 (7.5 A) for the fuel tank selector switch is marked 'F100 F350 Only'.
What fuse covers the back-up lamps and windshield washer pump?: Fuse 11, rated 15 A, feeds the back-up lamps and windshield washer pump (See Page 19).