my transfercase will lock but my hubs will not lock but if i take the vacuum line off the front axle the light goes off but it will not go off when i take it out of 4wd the part time light stay on how can i fix this ?

Here is an 88 diagram...
http://www.dua1.com/AdminFiles/Jeep/88/88_Transfer_case_command_trac_with_vacuum.pdf