Which fuse powers the windshield wiper switch?

Power is supplied through fuse 11 to the windshield wiper switch when the ignition switch is in the RUN or ACCY position. Fuse 11 also protects the washer circuit — a blown fuse 11 is a first check if the washer fails.

Where is the windshield wiper motor located?

The W/S wiper motor is under the LH side of the instrument panel; the wiper governor is behind the instrument panel left of the column; the washer pump motor is in the engine compartment on the LH inner fender, on the windshield washer reservoir.

What are the wire colors at wiper connector C502?

For the conventional wiper: 951 gr/bk, 763 o/w, 950 w/bk, 63 r, 56 bl, 58 w/o, 28 bk/w. For the interval wiper: 941 bk/w, 297 bk/gr, 296 r, 63 r, 56 bl, 58 w/o, 28 bk/w. C502 is a curved, gray, 7-terminal connector behind the instrument panel, left of the column.

What should I check if the wipers fail to park?

Turn the wiper switch to OFF and check for power at terminals of wires 63 (r), 28 (bk/w) and 58 (w/o) at connector C502. If all three are hot or only one is hot, repair or replace the wiper motor. If 63 and 28 are hot but 58 is not: replace the wiper switch (conventional) or the governor (interval wipers).

What if the windshield washer doesn't work?

Check for fluid in the reservoir, check for a blown fuse 11, and check voltage at terminal of wire 950 (w/bk) of the wiper switch. Then verify voltage at wire 951 (gr/bk) with the knob pushed in, check that the washer pump motor ground is good, and check for voltage at the motor; replace the switch or repair/replace the washer pump motor as indicated.

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1979 Ford Bronco F100-F350 Windshield Wiper/Washer Circuit Troubleshooting

Ford truck windshield wiper and washer circuit operation and troubleshooting page with C502 connector views

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Wiper/washer how-it-works and troubleshooting for conventional and intermittent wipers through fuse 11; lists wire 763 (o/w), 58 (w/o), 56 (bl) test points and C502 connector pinouts.

AI caption August 2014 · Photo 36 of 48

This page (page 36) from a Ford electrical troubleshooting guide covers the Windshield Wiper/Washer circuit, apparently for 1979 Ford Bronco and F100–F350 trucks based on the album set. It explains how the circuit works: the system includes a wiper motor, washer pump and motor, fluid reservoir, control switch with an internal circuit breaker, and (for intermittent wipers) a variable governor. Power is supplied through fuse 11 with the ignition in RUN or ACCY. Two step-by-step trouble-shooting flows are provided: one for conventional wipers and one for interval (intermittent) wipers, covering wipers that do not operate, fail to park, and washer failures. Each step references specific circuit numbers and wire colors, e.g. 763 (o/w), 63 (r), 58 (w/o), 56 (bl), 28 (bk/w), 297 (bk/gr), 950 (w/bk), 951 (gr/bk), 57 (bk), 941 (bk/w), 296 (r). Two connector pinout diagrams show wiper connector C502 for interval and conventional wipers. A component location table lists the wiper motor, governor, washer pump motor, connectors C501, C502, C504, C505 (with connector descriptions), splice S805, and grounds G502 and G701. Useful for diagnosing wiper switch, motor, governor, and washer pump problems using wire numbers and connector locations.

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Frequently asked questions

Which fuse powers the windshield wiper switch?: Power is supplied through fuse 11 to the windshield wiper switch when the ignition switch is in the RUN or ACCY position. Fuse 11 also protects the washer circuit — a blown fuse 11 is a first check if the washer fails.
Where is the windshield wiper motor located?: The W/S wiper motor is under the LH side of the instrument panel; the wiper governor is behind the instrument panel left of the column; the washer pump motor is in the engine compartment on the LH inner fender, on the windshield washer reservoir.
What are the wire colors at wiper connector C502?: For the conventional wiper: 951 gr/bk, 763 o/w, 950 w/bk, 63 r, 56 bl, 58 w/o, 28 bk/w. For the interval wiper: 941 bk/w, 297 bk/gr, 296 r, 63 r, 56 bl, 58 w/o, 28 bk/w. C502 is a curved, gray, 7-terminal connector behind the instrument panel, left of the column.
What should I check if the wipers fail to park?: Turn the wiper switch to OFF and check for power at terminals of wires 63 (r), 28 (bk/w) and 58 (w/o) at connector C502. If all three are hot or only one is hot, repair or replace the wiper motor. If 63 and 28 are hot but 58 is not: replace the wiper switch (conventional) or the governor (interval wipers).
What if the windshield washer doesn't work?: Check for fluid in the reservoir, check for a blown fuse 11, and check voltage at terminal of wire 950 (w/bk) of the wiper switch. Then verify voltage at wire 951 (gr/bk) with the knob pushed in, check that the washer pump motor ground is good, and check for voltage at the motor; replace the switch or repair/replace the washer pump motor as indicated.