What fuse powers the backup lights on the Bronco and F100-350?

Fuse 11, rated 15 Amps, which is hot when the ignition switch is in Accessory or Run.

What wire colors are used in the backup light circuit?

Black/green (bk/gr) from the ignition feed to Fuse 11, black/red (bk/r) from the switch to the lights, black/pink (bk/p) and white/purple (w/p) at the switches, black/yellow (bk/y) on the F100-350 automatic transmission switch, and black (bk) to ground.

Where is the backup light switch located?

Per the component table: 3 speed manual — in the engine compartment on the steering column; 4 speed manual — top rear of the transmission.

Where do the backup lights ground?

Grounds G1001 and G1002, which are eyelets on the "D" pillar reinforcement, via splices S1105 and S1205 (near the eyelet grounds).

What is connector C1017 and where is it located?

C1017 is an oval, brown, 2-terminal connector located in the engine compartment on the LH fender apron.

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1979 Ford Bronco & F100-F350 Backup Lights Wiring Diagram - Fuse 11 Circuit

Ford Bronco and F-100-350 backup light wiring diagram with manual and automatic switches

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Backup lamp wiring for Bronco and F-100-350: separate paths for 3-speed/4-speed manual and automatic transmission backup-light switches through fuse 13, with connector and ground locations.

AI caption August 2014 · Photo 19 of 48

This page (page 19) from a Ford wiring diagram manual covers the Backup Lights circuit for the Bronco and F100 through F350 trucks. Two schematics are shown side by side: the left applies to the Bronco only and the right to F100-350 pickups. Both circuits are powered through Fuse 11 (15 Amps), hot when the ignition switch is in Accessory or Run, fed by a black/green (bk/gr) wire. Power passes through connector C1015 to the backup light switch — separate switches shown for manual (3 or 4 speed) and automatic transmissions — then out on black/red (bk/r) wiring through connector C1017 to the left and right backup lights, which ground at G1001 and G1002 (eyelets on the "D" pillar reinforcement). The F100-350 diagram also shows branches for Styleside pickup versus all other styles, a splice S1003, and a feed at C1013 for camper backup lights. A legend table lists each component's location and connector description, including connectors C1002, C1004, C1006, C1009, C1013, C1015, C1017, C1204 and C1207 (with shapes, colors, and terminal counts), splices S1003, S1105, S1205, and grounds G1001/G1002. Wire color codes (bk/gr, bk/r, bk/p, w/p, bk/y, bk) are labeled throughout.

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Frequently asked questions

What fuse powers the backup lights on the Bronco and F100-350?: Fuse 11, rated 15 Amps, which is hot when the ignition switch is in Accessory or Run.
What wire colors are used in the backup light circuit?: Black/green (bk/gr) from the ignition feed to Fuse 11, black/red (bk/r) from the switch to the lights, black/pink (bk/p) and white/purple (w/p) at the switches, black/yellow (bk/y) on the F100-350 automatic transmission switch, and black (bk) to ground.
Where is the backup light switch located?: Per the component table: 3 speed manual — in the engine compartment on the steering column; 4 speed manual — top rear of the transmission.
Where do the backup lights ground?: Grounds G1001 and G1002, which are eyelets on the "D" pillar reinforcement, via splices S1105 and S1205 (near the eyelet grounds).
What is connector C1017 and where is it located?: C1017 is an oval, brown, 2-terminal connector located in the engine compartment on the LH fender apron.