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Re: 00 Sierra Z71 transfer case troubles.
Check your fuses, usually there is one for the transfer case and one for the front actuator(4WD?). You could check the connector for the front axle actuator for power. One wire should have 12v any time the key is on(brown?) and another should have power whenever a 4WD mode(4HI or 4LO) is selected(lt blue?)
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