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1979 Ford Bronco Power Rear Window Wiring Diagram & Troubleshooting - Fuse 10
Reference · 1978-1979 BroncoAll 116 wiring diagrams
Bronco power rear window wiring through fuse 10 and accessory safety relay to dash three-way switch and key-actuated tailgate switch; window motor with limit switch, plus troubleshooting steps.
Part of 1978-1979 Ford Bronco Wiring Diagrams
This page (page 38) from a Ford Bronco/F100-F350 electrical troubleshooting manual covers the Power Rear Window system, noted as "Bronco Only." It explains how the system works: power feeds through Fuse 10 (20 Amps) to the accessory safety relay, then to a dash-mounted three-way UP/DOWN/OFF switch, while a key-actuated tailgate switch is always hot through a fuse link and connector 222 on the right-hand fender apron. A two-way motor raises and lowers the tailgate window, and a limit switch governs upward travel. A detailed trouble-shooting flow guides diagnosis: checking Fuse 10, testing the key switch, checking power at relay input/output terminals (black with green stripe and black with white stripe wires), the control switch, tailgate switch feed, glass binding, limit switch continuity, and motor replacement. A wiring schematic shows the circuit with wire color codes (bk/w, bk/gr, bl/bk, p/gr, p/bl, y/r, r/y, etc.), splices S211, S403, S805, ground G701, and connectors C1903, C1905, C1907, and C1911. A component location table lists physical locations of the relay, switches, limit switch, motor, connectors (with shape/color/terminal counts), splices, and ground point.
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Frequently asked questions
- Which fuse powers the Bronco power rear (tailgate) window?
- Fuse 10, rated 20 Amps, powers the dash-mounted switch when the ignition switch is in ON or ACCY positions.
- Why does the key switch in the tailgate work when the dash switch doesn't?
- The tailgate key switch is "always hot" through a fuse link. If the key switch operates the window, check the feed to fuse 10 and the wire from fuse 10 to the accessory safety relay.
- Where is the accessory safety relay located?
- On the instrument panel reinforcement of the brake pedal support.
- What should I check if neither switch operates the tailgate window?
- Check for binding of the rear window glass on the run and repair binding first. If the glass isn't binding, test for continuity across the limit switch in the closed window position (plunger in); replace the limit switch if there is no continuity, or repair/replace the power window motor if there is continuity.
- What connectors are used in the power rear window circuit and where are they?
- C1903 (round, brown, 3 terminals) in the engine compartment LH side near the dash panel; C1905 (rectangular, blue, 3 terminals) at the rear of vehicle, LH frame side member; C1907 (round, brown, 3 terminals) in the "D" pillar forward of the LH rear lamps; and C1911 (rectangular, brown, 2 terminals) inside the tailgate center.
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