What fuse powers the tailgate window circuit in this diagram?

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

Where does the main power feed for the relays come from?

A 10-gauge wire run from the battery to the driver's side taillight area supplies the two SPDT relays.

What relays are used and what are their pin numbers?

Two SPDT relays with standard pins 85, 30, 87a, 87, and 86; the coil terminals are shown grounded on one side.

What does the tailgate latch switch do in this circuit?

It is open when the tailgate is not fully closed, interrupting the circuit (via the T/BK and R/Y wires) so the power window motor cannot run unless the tailgate is latched.

Home/ Registry/ Ford/ Bronco/ 1992-1996/ “Eddie Bauer”/ Photo supermotors.net/registry/media/1117998

Ford Bronco Tailgate Power Window Alternate Wiring Diagram with SPDT Relays

Wiring diagram for a tailgate power window circuit with relays and switches

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Color-coded wiring diagram of a tailgate window circuit showing master switch, SPDT relays, latch switch, and power motor.

AI caption August 2017 · Photo 2567 of 3001

This is a hand-drawn/edited wiring diagram (credited to "eighty5eddie") showing an alternate wiring scheme for a Ford Bronco power tailgate window circuit. Power originates from fuse panel position 14 (20A circuit breaker, hot in ACC or RUN) via a LB/BK wire to the master tailgate window switch on the dash, and separately from a 10-gauge wire run from the battery to the driver's side taillight area to feed two SPDT relays. Each relay (with pins labeled 85, 30, 87a, 87, and 86 and grounded 87a/coil terminals) controls the up and down motor circuits. The master switch outputs P/LG and PK/LB wires to the relay coils; a BK/W wire and circuit 517 connect to the key-operated tailgate window switch on the tailgate itself. A T/BK wire feeds the tailgate latch switch, which is noted as "open when tailgate is not fully closed," acting as a safety interlock. Y/R and R/Y wires connect the relays and latch switch to the tailgate power window motor. The diagram notes "no ground needed" at the master switch. Wire color codes, relay pinouts, and the safety-latch logic are the key takeaways for anyone rewiring a failing tailgate window circuit with relays.

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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 (c.b.), which is hot in ACC or RUN, feeding a LB/BK wire to the master tailgate window switch.
Where does the main power feed for the relays come from?: A 10-gauge wire run from the battery to the driver's side taillight area supplies the two SPDT relays.
What relays are used and what are their pin numbers?: Two SPDT relays with standard pins 85, 30, 87a, 87, and 86; the coil terminals are shown grounded on one side.
What does the tailgate latch switch do in this circuit?: It is open when the tailgate is not fully closed, interrupting the circuit (via the T/BK and R/Y wires) so the power window motor cannot run unless the tailgate is latched.
What wire colors connect the master switch to the relays and tailgate switch?: P/LG and PK/LB wires run from the master tailgate window switch to the relays, a BK/W wire and circuit 517 connect to the key-operated tailgate window switch, and Y/R and R/Y wires feed the tailgate power window motor.