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Home >> Jeep >> 1978 >> Cherokee Base, 2D Utility, 6.6L Eng VIN Z >> Repair and Diagnosis >> Electrical >> Body Electrical >> Tailgate Window Defogger >> Testing >> Control Switch
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Control Switch

Turn ignition switch "ON" and press defogger switch. Disconnect the wiring harness at connector under dash. Connect a test lamp (12 volt) from purple wire to ground and test lamp should light. Turn defogger switch off and test lamp should not light.

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