1. Check the Wiper Switch:
* Visual Inspection: Remove the switch (usually involves removing the steering column shroud) and carefully inspect it for any obvious damage, burnt contacts, or loose connections. Look for corrosion.
* Continuity Test (Requires a multimeter): With the switch disconnected, use a multimeter to check for continuity between the terminals. Refer to a wiring diagram for your Probe to identify the correct terminals for the wiper motor circuit. The switch should show continuity when in the "on" positions and no continuity when off. A faulty switch will fail this test. A wiring diagram is crucial here.
2. Check the Wiring and Connections:
* Visual Inspection: Trace the wiring harness from the wiper switch to the wiper motor. Look for any broken, frayed, or corroded wires. Pay close attention to the connectors at each end.
* Continuity Test (Requires a multimeter): With the switch in the "on" position, check for continuity between the wiper motor connector and the switch. If there's no continuity, you have a break in the wiring somewhere between these points. You'll need to carefully trace the wires to find the break.
* Ground Connection: Make sure the wiper motor has a good ground connection. A poor ground can prevent the motor from operating. Clean any corrosion from the ground point.
3. Check the Wiper Motor Itself:
* Power to the Motor: If you have continuity from the switch to the motor, connect the multimeter directly to the motor connector while someone turns the switch on. You should see power at the motor connector if the switch and wiring are good. No power here points to a wiring or switch problem.
* Direct Power Test (Use caution!): *Only do this as a last resort*. Directly connect 12V power to the wiper motor terminals (using alligator clips). Be extremely careful not to short the connections. Refer to a wiring diagram to correctly identify the power and ground terminals for the motor. If the motor runs, the problem is in the switch or wiring. If it doesn't run, the motor is likely faulty.
4. Accessing the Wiper Motor:
The wiper motor is usually located under the hood, behind the cowl (the area where the windshield meets the hood). Accessing it will require some work, depending on your model. Consult a repair manual or online resources specific to your 1994 Ford Probe for detailed instructions.
Important Considerations:
* Wiring Diagram: A wiring diagram for your specific 1994 Ford Probe is essential for accurate troubleshooting. You can often find these online through forums or repair manual websites.
* Safety: Disconnect the battery negative terminal before working with any electrical components.
* Repair Manual: A repair manual will provide detailed instructions and diagrams to help you troubleshoot and repair the system.
If you're not comfortable working with car electrical systems, it's best to take your Probe to a qualified mechanic. Replacing a wiper motor is usually relatively straightforward, but diagnosing the problem beforehand is crucial to avoid unnecessary parts replacement.
