What fuse powers the Bronco power rear tailgate window?

Fuse 10, a 20 amp fuse. It powers the dash-mounted switch through the accessory safety relay only when the ignition switch is in the ON or ACCY position.

Why does the key switch in the tailgate work when the dash switch doesn't?

The tailgate switch is an 'always hot' three-way switch powered through a fuse link and connector 222 on the engine compartment right hand fender apron, so it has a separate feed from the dash switch. If the key switch works, check the feed to fuse 10 and the wire from fuse 10 to the safety relay.

Where is the accessory safety relay for the Bronco rear window located?

On the instrument panel reinforcement of the brake pedal support.

What should I check if neither switch will operate the tailgate window?

First check for binding of the rear window glass on its run and repair any binding. If the glass is not binding, test for continuity across the limit switch with the window closed (plunger in); replace the limit switch if there is no continuity, or repair/replace the power window motor if there is continuity.

Where are connectors C1903, C1905, C1907 and C1911 located?

C1903: engine compartment LH side near dash panel (round, brown, 3 terminals); C1905: rear of vehicle, LH frame side member (rectangular, blue, 3 terminals); C1907: rear of vehicle in the 'D' pillar forward of the LH rear lamps (round, brown, 3 terminals); C1911: inside tailgate center (rectangular, brown, 2 terminals).

Home/ Registry/ Ford/ Bronco/ 1978-1979/ “Black Betty”/ Photo supermotors.net/registry/media/1105106

1979 Ford Bronco Power Rear Window Wiring Diagram & Troubleshooting (Tailgate)

Ford Bronco power rear window wiring and trouble-shooting: fuse 10, accessory safety relay, tailgate switch

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Bronco-only power rear window page with how-it-works text and wiring schematic: fuse 10 feed through accessory safety relay to the tailgate three-way switch and two-way motor.

Part of 1978-1979 Ford Bronco Wiring Diagrams

AI caption March 2017 · Photo 1639 of 1710

This is page 38 of a Ford electrical/vacuum troubleshooting manual covering the Bronco and F100-F350 trucks, showing the Power Rear Window circuit (Bronco Only). The 'How It Works' section explains that the dash-mounted three-way (UP/DOWN/OFF) switch is powered through Fuse 10 (20 amps) via the accessory safety relay, only with the ignition in ON or ACCY, while the key-actuated tailgate switch is always hot through a fuse link and connector 222 on the right fender apron. Upward window travel is limited by a tailgate window limit switch, and the glass is driven by a two-way motor. A step-by-step trouble-shooting flow covers checking fuse 10, relay input/output power, control switch outputs, key-actuated switch power, window glass binding, limit switch continuity, and motor replacement. The wiring diagram shows the accessory safety relay, tailgate window regulator control switch, rear window regulator control switch (key actuated), limit switch, and tailgate power window motor with wire colors (bk/w, bl/bk, bk/gr, p/gr, p/bl, y/r, r/y, t/bk) and connectors C1903, C1905, C1907, C1911, splices S211, S403, S805, and ground G701. A legend table lists each component's physical location and connector descriptions (shape, color, terminal count).

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Frequently asked questions

What fuse powers the Bronco power rear tailgate window?: Fuse 10, a 20 amp fuse. It powers the dash-mounted switch through the accessory safety relay only when the ignition switch is in the ON or ACCY position.
Why does the key switch in the tailgate work when the dash switch doesn't?: The tailgate switch is an 'always hot' three-way switch powered through a fuse link and connector 222 on the engine compartment right hand fender apron, so it has a separate feed from the dash switch. If the key switch works, check the feed to fuse 10 and the wire from fuse 10 to the safety relay.
Where is the accessory safety relay for the Bronco rear window located?: On the instrument panel reinforcement of the brake pedal support.
What should I check if neither switch will operate the tailgate window?: First check for binding of the rear window glass on its run and repair any binding. If the glass is not binding, test for continuity across the limit switch with the window closed (plunger in); replace the limit switch if there is no continuity, or repair/replace the power window motor if there is continuity.
Where are connectors C1903, C1905, C1907 and C1911 located?: C1903: engine compartment LH side near dash panel (round, brown, 3 terminals); C1905: rear of vehicle, LH frame side member (rectangular, blue, 3 terminals); C1907: rear of vehicle in the 'D' pillar forward of the LH rear lamps (round, brown, 3 terminals); C1911: inside tailgate center (rectangular, brown, 2 terminals).