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The system is up and running electrically if the the lights coincide what you are doing and not flashing. This tells me that there is a mechanical issue in the front axle most likely. Give me a minute to refresh myself I believe there is a vacuum solenoid but want to make sure. brb.
Okay that helps this means that the t-case motor is most likely stuck from lack of use pretty common. I would try TAPPING the t-case motor with a hammer while you have someone pushing the 4x4 button. Should jar it free if not may be time for a new t-case motor it is 13 now. What buttons do you have 4x2, 4x4 hi,lo,and auto? or no hi just lo and auto
Good luck and keep me posted.Use 4 hi while tapping.
Accept the first and i will respond