What fuse protects the windshield wiper circuit and what is its rating?

Fuse 11, rated at 15 Amps, protects both the conventional and interval windshield wiper/washer circuits.

What wire colors connect the wiper switch to the wiper motor?

Circuits 56 bl (blue), 58 w/o (white/orange), 28 bk/w (black/white), and 63 r (red) run from the wiper/washer switch through connector C502 to the windshield wiper motor.

What extra component does the interval (intermittent) wiper system use?

The interval wiper system adds a Windshield Wiper Governor module and a 2-speed intermittent wiper/washer switch, connected through connector C504 and grounded at G502.

Where does the windshield washer pump motor ground?

The washer pump motor grounds through black (bk) wires via splice S805 to ground point G701 in both diagrams.

What wire feeds the washer pump motor?

Circuit 951 gr/bk (gray/black) runs through connector C505 to the windshield washer pump motor.

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1979 Ford Bronco/F100-F350 Wiring Diagram - Conventional & Interval Wipers

Wiring diagram page for conventional and interval windshield wiper circuits

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Wiring diagram page showing conventional and interval windshield wiper circuits with wiper motors, switches, and governor.

AI caption March 2017 · Photo 1639 of 1711

This page (page 37) from a Ford wiring diagram manual shows two side-by-side schematics for the windshield wiper and washer circuits: 'Conventional Wipers' on the left and 'Interval Wipers' on the right. Both circuits are fed by Fuse 11 (15 Amps) on a circuit hot at all times, plus a feed hot when the ignition switch is in Run or Accessory (referencing page 9 for power distribution). The conventional circuit shows the windshield wiper/washer switch (Off/Low/Hi positions) connected through connectors C501, C502, and C505 to the windshield wiper motor and windshield washer pump motor, grounding at splice S805 and ground G701. The interval circuit adds a 2-speed intermittent switch (Intermittent/Off/Low/High) and a windshield wiper governor module, with connectors C501, C502, C504, C505 and grounds G502 and G701. Wire circuit numbers and color codes are labeled throughout, including 763 o/w, 950 w/bk, 951 gr/bk, 56 bl, 58 w/o, 28 bk/w, 63 r, 296 r, 297 bk/gr, 941 bk/w, 57 bk, and bk/lg. A reader can trace wiper power, switch logic, motor speed wiring, washer pump feed, and ground points for both wiper system variants.

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Frequently asked questions

What fuse protects the windshield wiper circuit and what is its rating?: Fuse 11, rated at 15 Amps, protects both the conventional and interval windshield wiper/washer circuits.
What wire colors connect the wiper switch to the wiper motor?: Circuits 56 bl (blue), 58 w/o (white/orange), 28 bk/w (black/white), and 63 r (red) run from the wiper/washer switch through connector C502 to the windshield wiper motor.
What extra component does the interval (intermittent) wiper system use?: The interval wiper system adds a Windshield Wiper Governor module and a 2-speed intermittent wiper/washer switch, connected through connector C504 and grounded at G502.
Where does the windshield washer pump motor ground?: The washer pump motor grounds through black (bk) wires via splice S805 to ground point G701 in both diagrams.
What wire feeds the washer pump motor?: Circuit 951 gr/bk (gray/black) runs through connector C505 to the windshield washer pump motor.