What circuits does this 1979 Bronco wiring diagram page cover?

Two sections: Fig. 10.139 shows the radio circuits (AM, AM/FM monaural, digital AM with clock, AM/FM/MPX, C.B. radio and speakers) plus the 4-wheel drive indicator lamp and differential lockout indicator lamp switch; Fig. 10.140 shows the headlamp switch, dimmer switch, headlamps, hi-beam indicator, park/turn-signal lamps and side marker lamps.

What wire feeds the 1979 Bronco radios?

Circuit 137 Y-BK (yellow-black) feeds the radio receivers, running through connectors C-506/C-506A, with speaker circuits 784 P, 806 W and 807 O through C-507 to speakers at C-510 and C-511.

Where do the headlamp circuits ground on a 1979 Bronco?

The lamps ground through circuit 57 BK via splices S-807 to grounds G-801 and G-802.

What wire colors run the low-beam headlamps in Fig. 10.140?

Circuit 12 GR-BK (low beam) and 13 R-BK (high beam) from the headlamp dimmer switch at connector C-803, through splice S-801 and connectors C-801/C-807; the hi-beam indicator uses 34 GR-BK.

What connector is the headlamp switch on this diagram?

The headlamp switch connects at C-701, fed from the fuse panel via circuits 8 O-Y and 383 R-W, with park lamp output on circuit 285 BR and 15 R-Y to the dimmer switch.

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1979 Ford Bronco Wiring Diagram - Radio, Headlamps & Exterior Lighting (Haynes)

1979 Ford Bronco Wiring Diagram (Haynes Fig. 10.140)

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Haynes 1979 Bronco wiring schematic (continued) detailing additional circuit branches, connectors and component grounds with wire callouts.

AI caption May 2007 · Photo 103 of 126

This page (page 266) from a Haynes manual contains two wiring diagram sections for the 1979 Ford Bronco. The upper diagram, Fig. 10.139, covers the radio and indicator circuits, including the AM radio receiver, digital AM radio with clock receiver, AM/FM monaural radio receiver, AM/FM/MPX radio receiver, C.B. receiver/transmitter radio, C/B radio suppression choke, radio receiver speakers, the 4-wheel drive indicator lamp, and the differential lockout indicator lamp switch. Wire circuits shown include 137 Y-BK, 784 P, 806 W, 807 O, 282 GR, 287 BK, 822 BR, 210 BL, 297 BK-GR and 932 BL, with connectors C-416 through C-418, C-506 through C-514, and C-530 through C-533. The lower diagram, Fig. 10.140, covers exterior lighting: the headlamp switch (C-701), headlamp dimmer switch (C-803), left and right low-beam headlamps, hi-beam indicator lamp, front park & turn-signal lamps, front side marker lamps, and turn/emergency signal wiring. Power feeds come from the fuse panel (circuits 8 O-Y and 383 R-W) and splices, with common circuits 285 BR (park lamps), 12 GR-BK and 13 R-BK (headlamps), 15 R-Y, 810 R-BK, and 57 BK grounds at G-801 and G-802. A reader can trace wire colors, circuit numbers, connectors, splices and grounds for these systems.

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Frequently asked questions

What circuits does this 1979 Bronco wiring diagram page cover?: Two sections: Fig. 10.139 shows the radio circuits (AM, AM/FM monaural, digital AM with clock, AM/FM/MPX, C.B. radio and speakers) plus the 4-wheel drive indicator lamp and differential lockout indicator lamp switch; Fig. 10.140 shows the headlamp switch, dimmer switch, headlamps, hi-beam indicator, park/turn-signal lamps and side marker lamps.
What wire feeds the 1979 Bronco radios?: Circuit 137 Y-BK (yellow-black) feeds the radio receivers, running through connectors C-506/C-506A, with speaker circuits 784 P, 806 W and 807 O through C-507 to speakers at C-510 and C-511.
Where do the headlamp circuits ground on a 1979 Bronco?: The lamps ground through circuit 57 BK via splices S-807 to grounds G-801 and G-802.
What wire colors run the low-beam headlamps in Fig. 10.140?: Circuit 12 GR-BK (low beam) and 13 R-BK (high beam) from the headlamp dimmer switch at connector C-803, through splice S-801 and connectors C-801/C-807; the hi-beam indicator uses 34 GR-BK.
What connector is the headlamp switch on this diagram?: The headlamp switch connects at C-701, fed from the fuse panel via circuits 8 O-Y and 383 R-W, with park lamp output on circuit 285 BR and 15 R-Y to the dimmer switch.