What fuse powers the tailgate window circuit in this diagram?

Fuse panel position 14, a 20A circuit breaker that is hot in ACC or RUN, feeding a LB/BK wire to the master tailgate window switch.

What type of relays does this alternate tailgate wiring use?

Two SPDT relays with standard pin numbering: 85, 30, 87a, 87, and 86 (85/86 for the coil, 30/87/87a for the switched contacts).

What does the tailgate latch switch do in this circuit?

The tailgate latch switch is open when the tailgate is not fully closed, interrupting the circuit to the tailgate power window motor.

What wire colors run from the switches to the tailgate window motor?

The key-operated tailgate window switch feeds Y/R and T/BK wires; the T/BK goes through the tailgate latch switch, then an R/Y wire continues to the tailgate power window motor. Other colors in the circuit include P/LG, PK/LB, BK/W and LB/BK.

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Ford Bronco Tailgate Power Window Relay Wiring Diagram - SPDT Relay Upgrade

Wiring diagram for tailgate power window with relays, switches and color-coded wires

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Wiring diagram showing the tailgate power-window circuit with SPDT relays, master and key switches, fuse panel, and color-coded wires.

AI caption November 2017 · Photo 2933 of 3001

This document is a hand-modified color wiring diagram (credited to "eighty5eddie") showing an alternate wiring scheme for a Ford Bronco power tailgate window using two SPDT relays. Power originates from fuse panel position 14 (a 20A circuit breaker, hot in ACC or RUN) via a LB/BK wire feeding the master tailgate window switch, plus a heavy 10-gauge wire run from the battery to the driver's side taillight area supplying the relays. The master tailgate window switch (marked "no ground needed") outputs P/LG and PK/LB wires to trigger the coils (pins 85/86) of two SPDT relays, whose contacts (30, 87, 87a) switch battery power. Relay outputs feed through connector 517 to the key-operated tailgate window switch, then via Y/R and T/BK wiring through the tailgate latch switch (which is open when the tailgate is not fully closed) and an R/Y wire to the tailgate power window motor. Wire color codes shown include LB/BK, P/LG, PK/LB, BK/W, Y/R, T/BK, and R/Y. Relay pin numbering (85, 30, 87a, 87, 86) and ground points are labeled for both relays. A reader can learn the complete relay-upgraded circuit path for the tailgate window, including the latch-switch safety interlock.

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Frequently asked questions

What fuse powers the tailgate window circuit in this diagram?: Fuse panel position 14, a 20A circuit breaker that is hot in ACC or RUN, feeding a LB/BK wire to the master tailgate window switch.
What gauge wire is used for the relay power feed?: A 10-gauge wire coming from the battery to the driver's side taillight area supplies power to the SPDT relays.
What type of relays does this alternate tailgate wiring use?: Two SPDT relays with standard pin numbering: 85, 30, 87a, 87, and 86 (85/86 for the coil, 30/87/87a for the switched contacts).
What does the tailgate latch switch do in this circuit?: The tailgate latch switch is open when the tailgate is not fully closed, interrupting the circuit to the tailgate power window motor.
What wire colors run from the switches to the tailgate window motor?: The key-operated tailgate window switch feeds Y/R and T/BK wires; the T/BK goes through the tailgate latch switch, then an R/Y wire continues to the tailgate power window motor. Other colors in the circuit include P/LG, PK/LB, BK/W and LB/BK.