Which fuse powers the radio in the 1979 Ford Bronco/F-Series?

Fuse 10 supplies power to the radio when the ignition switch is turned to RUN or ACCY.

What should speaker resistance measure when checking the speaker circuit?

The document says to check speaker connections for a resistance of 2 - 4 ohms.

Where are the speakers located for the different radio options?

AM and AM/FM monaural radios have a single dash-mounted speaker; the AM/FM multiplex radio has a speaker mounted in each door.

What steps should I take if the radio produces no sound?

Turn the tuner to make sure the radio is on a broadcasting frequency, check for a loose or disconnected antenna lead at the radio, and check for unplugged connector(s) at the speaker(s). If still inoperative, check fuse 10, power to fuse 10, and power to the radio connector.

What does the wiring diagram show about CB radio installations?

The diagram shows the radio speaker circuit through connector C514 with two branches — 'Without CB Radio' and 'With CB Radio' — the latter routing through a CB Radio Relay, using black (bk) and brown (br) wires.

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1979 Ford Bronco/F100-F350 Radio Circuit Troubleshooting & Wiring Diagram

Ford truck radio circuit operation and troubleshooting page with speaker resistance spec

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Radio how-it-works and troubleshooting: powered via fuse 10 in RUN/ACCY; AM/AM-FM monaural use one dash speaker, AM/FM multiplex uses door speakers; check speaker resistance 2-4 ohms.

AI caption August 2014 · Photo 34 of 48

This is page 34 of a Ford service/trouble-shooting reference covering the Radio circuit for 1979 Bronco and F100 through F350 trucks. The "How the Circuit Works" section explains that when the ignition switch is in RUN or ACCY, power travels through fuse 10 to the radio; AM and AM/FM monaural radios use a single dash-mounted speaker while the AM/FM multiplex radio has a speaker in each door. The Trouble-Shooting section provides step-by-step diagnostics: if there is no sound, verify the tuner is on a broadcast frequency, check the antenna lead, and check speaker connectors; if still inoperative, check fuse 10, power to fuse 10, and power at the radio connector (illustrated with a photo captioned "Checking For Power At Radio Connector"). Speaker circuit checks include continuity testing at speaker connections, verifying 2–4 ohm speaker resistance, and listening for a popping sound with a self-powered test light. Guidance is given for single and dual speaker system failures, ending with speaker replacement if all wiring checks pass. A partial wiring diagram shows the radio speaker circuit through connector C514, with branches for "Without CB Radio" and "With CB Radio" via a CB Radio Relay, using black (bk) and brown (br) wires.

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Frequently asked questions

Which fuse powers the radio in the 1979 Ford Bronco/F-Series?: Fuse 10 supplies power to the radio when the ignition switch is turned to RUN or ACCY.
What should speaker resistance measure when checking the speaker circuit?: The document says to check speaker connections for a resistance of 2 - 4 ohms.
Where are the speakers located for the different radio options?: AM and AM/FM monaural radios have a single dash-mounted speaker; the AM/FM multiplex radio has a speaker mounted in each door.
What steps should I take if the radio produces no sound?: Turn the tuner to make sure the radio is on a broadcasting frequency, check for a loose or disconnected antenna lead at the radio, and check for unplugged connector(s) at the speaker(s). If still inoperative, check fuse 10, power to fuse 10, and power to the radio connector.
What does the wiring diagram show about CB radio installations?: The diagram shows the radio speaker circuit through connector C514 with two branches — 'Without CB Radio' and 'With CB Radio' — the latter routing through a CB Radio Relay, using black (bk) and brown (br) wires.