What wire color and circuit number feeds the backup lamps?

Circuit 140, BK/PK (black/pink), which comes from connector C103 (page 93-1) through splice S116 and connectors C202 and C205 to splice S424, then to the left and right backup lamps.

How do the backup lamps ground?

Both lamps ground on circuit 57 BK (black) through splices S406 and S405 to splice S401, then to ground G100 (see grounds page 10-3).

What does the Trailer Backup Lamps Relay do?

Per the diagram callout, it "directs current to operate trailer backup lamps." It is located in the Trailer Relay Box, is fed by circuit 37 Y from Power Distribution (page 13-2) and the 140 BK/PK reverse signal, and when energized outputs circuit 963 BK/LG to the trailer backup lamps.

What circuit also branches off the backup lamp feed?

The Automatic Day/Night Mirror (page 125-1) is fed from the 140 BK/PK circuit through connectors C200M/C200F.

Which connectors carry circuit 963 BK/LG to the trailer backup lamps?

From the relay, circuit 963 BK/LG passes through C202M/C202F, C205F/C205M, C424M/C424F, and C417M/C417F to the trailer backup lamps.

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1996 Ford Bronco Backup Lamps Wiring Diagram (93-2) – Reverse & Trailer Relay

Ford EVTM page 93-2: backup lamps wiring diagram with day/night mirror and trailer relay

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Backup lamp wiring diagram showing left/right backup lamps, automatic day/night mirror and trailer backup lamps relay circuits.

AI caption July 2018 · Photo 327 of 386

This is page 93-2 ("Backup Lamps") of a Ford wiring diagram set, uploaded as part of a multi-page collection for a 1996 Ford Bronco. It shows the backup (reverse) lamp circuit. Power enters from connector C103 (referenced on page 93-1) on circuit 140 BK/PK (black/pink), passes through splice S116 and connectors C202M/C202F, with a branch through C200M/C200F feeding the Automatic Day/Night Mirror (page 125-1). The 140 BK/PK circuit continues through C205F/C205M to splice S424, which feeds the Left Backup Lamp (via C406F/C406M and C433) and the Right Backup Lamp (via C405F/C405M and C434). Both lamps ground on circuit 57 BK through splices S406, S405, and S401 to ground G100 (grounds page 10-3). The diagram also shows the Trailer Backup Lamps Relay in the Trailer Relay Box: it receives reverse-signal power on 140 BK/PK, battery feed on circuit 37 Y from Power Distribution page 13-2, grounds on 57 BK through S102 to G100 (grounds page 10-1), and when energized sends power on circuit 963 BK/LG (black/light green) through connectors C202, C205, C424M/C424F, and C417M/C417F to the trailer backup lamps. A callout notes the relay "Directs current to operate trailer backup lamps."

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Frequently asked questions

What wire color and circuit number feeds the backup lamps?: Circuit 140, BK/PK (black/pink), which comes from connector C103 (page 93-1) through splice S116 and connectors C202 and C205 to splice S424, then to the left and right backup lamps.
How do the backup lamps ground?: Both lamps ground on circuit 57 BK (black) through splices S406 and S405 to splice S401, then to ground G100 (see grounds page 10-3).
What does the Trailer Backup Lamps Relay do?: Per the diagram callout, it "directs current to operate trailer backup lamps." It is located in the Trailer Relay Box, is fed by circuit 37 Y from Power Distribution (page 13-2) and the 140 BK/PK reverse signal, and when energized outputs circuit 963 BK/LG to the trailer backup lamps.
What circuit also branches off the backup lamp feed?: The Automatic Day/Night Mirror (page 125-1) is fed from the 140 BK/PK circuit through connectors C200M/C200F.
Which connectors carry circuit 963 BK/LG to the trailer backup lamps?: From the relay, circuit 963 BK/LG passes through C202M/C202F, C205F/C205M, C424M/C424F, and C417M/C417F to the trailer backup lamps.