my 93 blazer does not even get a lite to 4 wheel drive and does not go into 4 wheel at all why?
Check vacuum lines from the tranny up!!!!
switch or most likely the TCCM. disconnect the battery and see what happens when you press it then. Also listen for clicking sound near the passenger floor board when you press the button, clicking means it's working. Before replaceing it be sure to check for power and ground to the TCCM
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