Safari Van M V6-262 4.3L VIN Z TBI (1990)
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Wiper Switch: Testing and Inspection
Fig. 3 Permanent Magnet Type Windshield Wiper Motor W/Pulse Wipers
1.
Disconnect electrical connectors from wiper motor.
2.
Check switch voltage using a digital voltmeter with ignition switch in the On position. If readings are not as specified at between various switch
positions and ground, replace switch.