Wiper Switch

This procedure removes and replaces the windshield wiper switch on a 1972 Ford F-100 with 302ci V8, accessed from beneath the dashboard.

Warnings

Tools required

Parts

• Windshield wiper switch × 1 — Use OEM specification
• Wire terminals (if damaged) × 1 — Use OEM specification

Preparation

1. Park vehicle on level surface and set parking brake
2. Disconnect negative battery cable to prevent electrical shorts
3. Allow steering column and dashboard area to cool if vehicle was recently driven
4. Position work light or flashlight to illuminate under-dash area on driver side

Procedure

1. 1

   Access the wiper switch area
   Position yourself lying on your back with your head beneath the steering column, looking upward at the underside of the dashboard. Locate the wiper switch mounted to the back of the instrument panel, accessible from beneath. The switch will have a mechanical cable connection to the wiper motor and electrical wire connections.
2. 2

   Label and document wire connections
   Before disconnecting anything, use masking tape and marker to label each wire terminal on the wiper switch. Note the wire colors and their positions. The switch typically has multiple electrical terminals (often 4 or more) to control LOW/HIGH wiper speeds and power; note the exact count and wire colors on your specific switch before disconnecting. Take a photo if possible for reference during reassembly. Verified detail (1972 F-100 wiper switches typically have 2 electrical terminals (power in and switched output to motor), not 3. Ground is usually through the mounting or switch body, not a dedicated terminal. The mechanical cable controls speeds, not multiple electrical connections.): The switch typically has 2 electrical terminals for power input and switched motor output.
3. 3

   Disconnect wiper motor cable
   This switch is electrically operated only and does not have a mechanical push-pull cable connection to the wiper motor. The two-speed wiper motor is controlled through the wiring harness. Skip this step if no cable is present; verify only that all electrical connections have been documented and disconnected.
4. 4

   Disconnect electrical terminals
   Using the wire terminal tool or needle-nose pliers, carefully disconnect each electrical wire terminal from the back of the switch. The terminals are spade-type connectors that pull straight off. Note that these are not grouped in a connector block but are individual wire terminals. Keep the wires separated and organized according to your labels.
5. 5

   Remove switch knob from front of panel
   From the driver seat position, grasp the wiper switch knob on the front of the instrument panel. Depending on the knob style, either pull it straight off (if friction-fit) or look for a small setscrew on the underside of the knob that must be loosened with a flathead screwdriver before pulling the knob free.
6. 6

   Remove switch bezel nut
   After removing the knob, you will see a threaded bezel nut or retaining collar on the switch shaft protruding through the instrument panel. From the front of the panel, unscrew this nut by turning it counterclockwise. This nut may be finger-tight or require gentle pressure with pliers wrapped in cloth to protect the finish.
7. 7

   Remove switch from instrument panel
   Return to the underside of the dashboard. With the bezel nut removed and all connections disconnected, pull the wiper switch straight back through the mounting hole in the instrument panel. The switch body will come free from the panel. Inspect the mounting hole and surrounding area for any damage or corrosion.
8. 8

   Prepare and install new switch
   Compare the old and new switches to verify correct replacement. Insert the new wiper switch through the instrument panel mounting hole from behind, ensuring the shaft protrudes through the front of the panel. The switch should sit flush against the back of the instrument panel.
9. 9

   Install bezel nut and knob
   From the driver seat position, thread the bezel nut onto the switch shaft and tighten it clockwise by hand until snug. Do not overtighten as this can crack the panel or damage the switch threads. Install the switch knob onto the shaft, aligning any setscrew holes, and secure according to the knob type.
10. 10

    Reconnect electrical terminals
    Working from beneath the dashboard, reconnect each electrical wire terminal to the new switch according to your labels and documentation. Push each spade terminal firmly onto its corresponding switch terminal until fully seated. Verify connections are secure by gently tugging on each wire.
11. 11

    Reconnect wiper motor cable
    No mechanical cable exists on this electrical wiper switch, so no cable reconnection is required. Proceed to verifying all electrical wire terminals are fully seated on the new switch.
12. 12

    Reconnect battery and test operation
    Reconnect the negative battery cable. Turn the ignition to the ON position (engine does not need to run). Test all wiper switch positions: OFF, LOW, and HIGH. Verify the wipers operate at correct speeds and return to the proper park position when switched off. Test the washer function if integrated with the switch. Verified detail (Intermittent (delay) wiper function was not available on the 1972 F-100. Mentioning it as a possible position is era-inappropriate and misleading for this vehicle.): Test all wiper switch positions: OFF, LOW, and HIGH. Verified detail (The 1972 F-100 has no electronic wiper-system warning lights or diagnostic indicators. This verification item is anachronistic.): Confirm the wiper system operates correctly through all speeds; note this vehicle has no wiper-related dashboard warning lights.

Reassembly

1. Ensure all wire terminals are fully seated and not loose
2. Verify the wiper motor cable is securely clipped to the switch
3. Check that the switch knob operates smoothly through all positions without binding
4. Reset clock and radio presets after battery reconnection

Verification

• Turn ignition to ON position and test wiper switch through all speed settings
• Verify wipers park correctly in the down position when switched off
• Confirm no binding or unusual resistance when moving the switch knob
• Check that all wiper speeds operate as expected (LOW and HIGH speeds are noticeably different)
• Test washer function if switch includes washer control
• Ensure no dashboard warning lights are illuminated related to wiper system

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