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

Fuse position 3 is a 35 Amp fuse with an orange (o) feed wire, protecting the Heater A/C circuit.

Which fuse controls the turn signal flasher?

Fuse position 9, a 15 Amp fuse with a bk/gr feed wire, protects the Turn Signal Flasher.

What does fuse position 10 protect?

Position 10 is a 20 Amp fuse (bk/gr wire) protecting Accessory Feeds, Speed Control, Power Tailgate Window (Bronco Only), Marker Lamp Relay, Dual Battery Relay, Axle Control, and the Four-Wheel Drive Indicator Lamp.

Is the fuse block the same in the Bronco and F-Series trucks?

Yes. The document states the fuse block is used in both Bronco and F-Series vehicles, with fuses mostly protecting the same circuits. Exceptions: fuse 6 (7.5A Auxiliary Fuel Tank Selector) is F-100/350 only and blank on Bronco, the lighted vanity on fuse 7 is F-Series only, and the power tailgate window on fuse 10 is Bronco only.

How should an ammeter be connected to read current flow?

Connect the ammeter in series with the circuit; connections may be made anywhere beyond a common point, such as between the resistor pack and motor or between the motor and ground. Refer to the shop manual for current draw specifications.

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1979 Ford Bronco & F100-F350 Fuse Block Diagram - Fuse Positions & Amp Ratings

Ford Bronco/F-Series fuse block chart with meter usage; fuse position, amp size, wire color, circuit protected

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Fuse block identification chart for Bronco/F-Series listing each fuse position, amp rating, feed wire color and protected circuit, alongside voltmeter/ohmmeter/ammeter usage notes.

AI caption August 2014 · Photo 48 of 48

This page from a Ford service/reference publication covers basic electrical test equipment and the fuse block used in Bronco and F-Series (F-100 through F-350) trucks. Three short instructional sections explain how to connect and use a DC voltmeter (measuring voltage and voltage drop to ground), an ohmmeter (measuring resistance with the battery negative terminal disconnected), and a DC ammeter (connected in series to read current draw of motor-driven mechanisms such as the blower and power window), each with an accompanying photo. The main feature is a 'Fuse Block' section stating the same fuse block is used in both Bronco and F-Series vehicles, with a diagram showing the physical layout of fuse positions 1–12 and a table listing each fuse position's amperage, feed wire color, and circuits protected. Notable entries include position 1 (blank), position 2 (3A, PRNDL lamp and instrument illumination), position 3 (35A heater A/C), position 6 (7.5A auxiliary fuel tank selector, F-100/350 only, blank on Bronco), position 7 (15A dome/cargo/courtesy/cigar lighter), position 8 (20A emergency flasher and stop lights), position 10 (20A accessory feeds including Bronco power tailgate window and 4WD indicator), and position 12 (7.5A radio). Readers can identify fuse locations, ratings, wire colors, and Bronco-vs-F-Series differences.

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Frequently asked questions

What size fuse protects the heater A/C on a 1979 Ford Bronco or F-Series truck?: Fuse position 3 is a 35 Amp fuse with an orange (o) feed wire, protecting the Heater A/C circuit.
Which fuse controls the turn signal flasher?: Fuse position 9, a 15 Amp fuse with a bk/gr feed wire, protects the Turn Signal Flasher.
What does fuse position 10 protect?: Position 10 is a 20 Amp fuse (bk/gr wire) protecting Accessory Feeds, Speed Control, Power Tailgate Window (Bronco Only), Marker Lamp Relay, Dual Battery Relay, Axle Control, and the Four-Wheel Drive Indicator Lamp.
Is the fuse block the same in the Bronco and F-Series trucks?: Yes. The document states the fuse block is used in both Bronco and F-Series vehicles, with fuses mostly protecting the same circuits. Exceptions: fuse 6 (7.5A Auxiliary Fuel Tank Selector) is F-100/350 only and blank on Bronco, the lighted vanity on fuse 7 is F-Series only, and the power tailgate window on fuse 10 is Bronco only.
How should an ammeter be connected to read current flow?: Connect the ammeter in series with the circuit; connections may be made anywhere beyond a common point, such as between the resistor pack and motor or between the motor and ground. Refer to the shop manual for current draw specifications.