Lincoln 9L1Z-17508-B Motor Assembly - Wiper

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Probe a grounded 12-volt test light to each terminal at a connector until it lights; this verifies voltage (power) at the terminal.

Ensure the battery is in good condition and has a strong charge. If the battery is fine, remove the wiper motor and operate the wiper arms by hand to check for binding linkage and pivots. Lubricate or repair as necessary, then reinstall the wiper motor. If the wipers still operate slowly, check for loose or corroded connections, especially the ground connection. If all connections look OK, replace the motor.