1993 GMC C1500 4 wheel drive

1993 GMC C1500
157,000 MILES • V8 • 4WD • AUTOMATIC
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When I shift to 4 wheel the front diff doesn't lock in I used an ohm meter on the sensor in the front diff and it show continiuty. checking the wires leading to the sensor I show no voltage, using a vdc meter do I insert the leads into each wire end to check or do I need to ground the black lead. Thanks
Jun 26, 2010 at 12:21 PM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.
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