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I have been investigating this and I've come to assume that since most people don't use their 4 wheel drive that often. Sometimes the switch it's self becomes rusty and the actuator that kicks in your 4 wheel drive and so forth. Make sure the switch is still getting contact and then the actuator try and lubricate it up so it slides in and out freely. And then from now on after you get it going. Kick it in 4 wheel drive about once a month to keep it free.

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Q: 99 silverado 4x4 switch light dont light up or go into 4wd?
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