Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSMERCURY1991TRACER BASE, 4D SEDAN, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 149 (WIPER/WASHER SYSTEM - REAR)TESTINGWIPER CIRCUIT TEST
1991 Mercury Tracer Base, 4D Sedan, Automatic
Wiper Circuit Test
1991 Mercury Tracer Base, 4D Sedan, AutomaticSECTION Wiper Circuit Test
WARNING: This page is about a different car, the 1994 Mercury Tracer and 1994 Ford Escort. However, it is still accessible from the selected car via links, so may be relevant.
- Inspect WIPER fuse. If fuse is okay, go to next step. If fuse is blown, inspect Dark Blue/Green wire for short to ground. Repair circuit as necessary. If fuse does not blow again, go to next step.
- Turn ignition and rear wiper on. Inspect WIPER fuse again. If fuse is okay, Dark Blue/Green wire is not shorted to ground. If fuse blows again, replace wiper motor.
- Unplug rear wiper motor connector. Turn ignition on. Check for battery voltage on Dark Blue/Green wire at wiper motor harness connector. If battery voltage exists, go to next step. If battery voltage does not exist, repair open in Dark Blue/Green wire.
- Reconnect wiper motor wiring. Unplug wiper switch connector. Turn ignition on. Measure voltage on Dark Blue/Black wire at wiper switch connector. If battery voltage exists, go to next step. If battery voltage does not exist, repair open in Dark Blue/Black wire.
- Turn ignition off. Measure resistance of Black wire between wiper switch connector and ground. If resistance is less than 5 ohms, go to next step. If resistance is greater than 5 ohms, repair poor ground or open in Black wire.
- Unplug wiper switch connector. Connect jumper between Dark Blue/Black wire of wiper switch connector and ground. Turn ignition on. If wiper operates, replace wiper switch. If wiper motor does not operate, replace wiper motor.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.