my front diff does not engauge on 1996 chevy blazer

check the encoder motor on the tcase and solenoid on axle for power.

i can hear the encoder motor moving when i press the buttons but the front wheels never engauge the tcase works i just believe the diff has a problem i even tryed manually pulling the cable under the battery to engauge the passenger side but it wont buge i would believe the driver side needs to be engauged 1st for it to work