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The easy things to check are:
-is the 4x4 fuse burnt?
-is your transfer case too full?
To check if the Tcase is too full you can open the upper (fill/level check) plug. If transmission fluid comes pouring out you could have a faulty gasket.
If it isn't one of those two problems it can be the switch, vacuum line problem, or the actuator motor itself. If your switch is flashing I would venture to guess it's not your switch. If you're hearing a clicking I would venture to guess it's a too much fluid problem or a vacuum problem.
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