What wire color feeds the backup lamps on a Bronco/F-Series?

Circuit 140, a BK/PK (black/pink) wire, feeds both left and right backup lamps, showing 12V in reverse.

How are the backup lamps grounded?

Through circuit 57 (BK, black). On the Bronco, via splices S406/S405 to S401 and ground G100 (see grounds page 10-5). On F-Series, via S406/S404 to G100 (see grounds page 10-4).

What connectors are used at the left and right backup lamps?

C433 for the left backup lamp and C434 for the right backup lamp.

How do trailer backup lamps get power?

On trailer-tow vehicles, the trailer backup lamps relay in the trailer relay box is triggered by circuit 140 BK/PK (via C149) and fed 12V by circuit 37 Y from power distribution (pages 13-2, 13-8); when energized it sends 12V on circuit 963 R/Y through C149, C424, and C417 to the trailer backup lamps.

What circuit controls the automatic day/night mirrors reverse signal?

The same 140 BK/PK backup lamp circuit branches from splice S232 to the automatic day/night mirrors (page 125-1).

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1996 Ford Bronco & F-Series Backup Lamps Wiring Diagram (Page 93-3)

Ford 93-3 Backup Lamps wiring diagram for Bronco and F-Series with backup lamps and trailer relay

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Wiring diagram for backup lamps showing Bronco and F-Series left and right backup lamp circuits with trailer backup lamp relay.

AI caption July 2018 · Photo 334 of 386

This is page 93-3 of a Ford factory wiring diagram covering the Backup Lamps circuit for Bronco and F-Series trucks. It shows circuit 140 (BK/PK, black/pink wire) feeding from connector C103 (referenced on page 93-1) through splice S116 and connectors C202/C205, with branches to the automatic day/night mirrors (page 125-1), Bronco backup lamps, F-Series backup lamps (including a Flare Side variant via C401), and a trailer-tow-only trailer backup lamps relay. On the Bronco side, circuit 140 splits at S424 through connectors C405/C406 to C433 (left backup lamp) and C434 (right backup lamp), grounding through circuit 57 (BK) via splices S406/S405/S401 to ground G100 (grounds on page 10-5). The F-Series side runs through S254, S426, C406 to C433/C434 lamps, grounding through S406/S404 to G100 (page 10-4). The trailer backup lamps relay in the trailer relay box receives circuit 140 at C149 and circuit 37 (Y, yellow, 12V from power distribution pages 13-2/13-8), outputting circuit 963 (R/Y) through C149, C424, and C417 to the trailer backup lamps, with ground via 57 BK through S104 (grounds pages 10-1, 10-7). Voltage test values (12V, 12V reverse, 0V, relay energized) are annotated throughout.

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Frequently asked questions

What wire color feeds the backup lamps on a Bronco/F-Series?: Circuit 140, a BK/PK (black/pink) wire, feeds both left and right backup lamps, showing 12V in reverse.
How are the backup lamps grounded?: Through circuit 57 (BK, black). On the Bronco, via splices S406/S405 to S401 and ground G100 (see grounds page 10-5). On F-Series, via S406/S404 to G100 (see grounds page 10-4).
What connectors are used at the left and right backup lamps?: C433 for the left backup lamp and C434 for the right backup lamp.
How do trailer backup lamps get power?: On trailer-tow vehicles, the trailer backup lamps relay in the trailer relay box is triggered by circuit 140 BK/PK (via C149) and fed 12V by circuit 37 Y from power distribution (pages 13-2, 13-8); when energized it sends 12V on circuit 963 R/Y through C149, C424, and C417 to the trailer backup lamps.
What circuit controls the automatic day/night mirrors reverse signal?: The same 140 BK/PK backup lamp circuit branches from splice S232 to the automatic day/night mirrors (page 125-1).