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Diff lock switch on '87 4kq



Last year, my diff locks worked as needed.  Earlier this year I had to tear
apart my dash, which involved disconnecting the diff lock switch/panel.  Now
my diff locks are not engaging.  I'm assuming (hoping) that the problem is
with the switch/vaccuum system and not the diffs themselves.  Do I have to
do something to "prime" the system since I had disconnected the vaccuum
hoses?  If not, I assume I'm looking for a vaccuum leak.  Is there an easy
way to diagnose?

TIA,
Aaron Peloquin
'87 4kq - awd, but not ready for snow :(