What circuits are shown on this 1979 Bronco wiring diagram page?

The upper diagram (Fig. 10.141) covers the turn and emergency signal switch, stoplamp switches (plunger and mechanical), emergency warning flasher, turn signal flasher, and turn indicator lamps. The lower diagram (Fig. 10.142) covers power distribution to the backup lamp switches, transmission gear shift neutral switch, and left rear lamps (side marker, stop/park/turn, backup, and license).

What wire color feeds the 1979 Bronco backup lamp circuit from the fuse panel?

Circuit 138 W-P (white-purple) comes from the fuse panel position F-11 (Power Distribution) and feeds the backup lamp switches; the output side is circuit 140 BK-R (black-red) to the backup lamps.

Which connectors are used for the 3-speed and 4-speed backup lamp switches?

The 3-speed backup lamp switch uses connector C-1016 and the 4-speed backup lamp switch uses connector C-1018, joined through connectors C-1017 and C-1015.

What does the diagram note about speed control on the turn signal circuit?

It notes that a marked connection point (X) makes no connection when the vehicle has speed control, and shows separate 810 R-BK routings for 'with speed control' versus 'without speed control,' plus a note that two circuits (284 R) may be reversed.

Where do the left rear lamps ground on the 1979 Bronco?

The L.H. rear side marker, stop/park/turn, and backup lamps ground through 57 BK (black) wires joined at splice S-1105 to ground G-1001.

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1979 Ford Bronco Wiring Diagram - Turn Signal, Flasher & Rear Lamp Circuits

1979 Ford Bronco Wiring Diagram (Haynes Fig. 10.142)

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Haynes 1979 Bronco wiring schematic (continued) showing transmission, lamp and connector circuits with splice and wire-color identification.

AI caption May 2007 · Photo 104 of 126

This is page 267 of a Haynes manual showing two continued wiring diagram sections for the 1979 Ford Bronco (Fig. 10.141 and Fig. 10.142). The upper diagram covers the turn and emergency signal switch circuit, including stoplamp switches (plunger and mechanical types), the emergency warning flasher, turn signal flasher, R.H. front park & turn signal lamp, and left/right turn indicator lamps, with distinctions between circuits with and without speed control (a note states an 'X' point makes no connection when the vehicle has speed control). Wire circuit numbers and colors such as 810 R-BK, 285 BR, 383 R-W, 282 GR, 283 Y-BK, 385 W-R, 44 BL, 2 W-BL, 3 GR-W and 57 BK are shown along with connectors C-305, C-713, C-802, C-804, C-805, C-806, C-208/C-208A and splice S-805 (Charge Start Run). The lower diagram covers power distribution from splice S-1202 and fuse panel position F-11 (138 W-P) to the backup lamp switches (3-speed and 4-speed manual), the transmission gear shift neutral switch (automatic transmission only), and left rear lighting: side marker, stop/park/turn, backup, and license lamps, grounding at G-1001 via splice S-1105. Connectors C-1015 through C-1018, C-1207, C-1209 and splice S-1104 appear.

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Frequently asked questions

What circuits are shown on this 1979 Bronco wiring diagram page?: The upper diagram (Fig. 10.141) covers the turn and emergency signal switch, stoplamp switches (plunger and mechanical), emergency warning flasher, turn signal flasher, and turn indicator lamps. The lower diagram (Fig. 10.142) covers power distribution to the backup lamp switches, transmission gear shift neutral switch, and left rear lamps (side marker, stop/park/turn, backup, and license).
What wire color feeds the 1979 Bronco backup lamp circuit from the fuse panel?: Circuit 138 W-P (white-purple) comes from the fuse panel position F-11 (Power Distribution) and feeds the backup lamp switches; the output side is circuit 140 BK-R (black-red) to the backup lamps.
Which connectors are used for the 3-speed and 4-speed backup lamp switches?: The 3-speed backup lamp switch uses connector C-1016 and the 4-speed backup lamp switch uses connector C-1018, joined through connectors C-1017 and C-1015.
What does the diagram note about speed control on the turn signal circuit?: It notes that a marked connection point (X) makes no connection when the vehicle has speed control, and shows separate 810 R-BK routings for 'with speed control' versus 'without speed control,' plus a note that two circuits (284 R) may be reversed.
Where do the left rear lamps ground on the 1979 Bronco?: The L.H. rear side marker, stop/park/turn, and backup lamps ground through 57 BK (black) wires joined at splice S-1105 to ground G-1001.