Question about 2004 GMC Sierra
For easy testing, purchase a low voltage test light. It resembles a screwdriver with a wire pigtail. Clip the aligator clip on the pigtail to a grounding point on the car and use the probe to test for power in your light sockets. If there's power, your problem could be loss of grounding. You need both a power wire and a grounding wire to complete the ciruit. Look for a damaged or severed grounding wire.
Posted on Nov 18, 2009
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Posted on Jan 02, 2017
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