4kq diff lock switch explanation?

[Lines Peter]

I don't have the Bentley in front of me, so I can't help you with the
various hose colors.
I can tell you that the diff will lock or unlock while moving.  The key to
locking is a lack of relative speed between the left rear and right rear
wheel.  If they are turning at different speeds, it won't lock.  As long as
you aren't in a tight turn or mid-burnout, this shouldn't be a problem.  The
key to unlocking is torque...  If the clutch is transmitting torque from
side to side, it can't unlock.  A little back and forth with the steering
wheel will usually free things up and allow it to unlock.
Does your car have an indicator light?  If so I'd recommend keeping it.  The
nice thing about the lights is that they show the ACTUAL clutch ring
position, not just the control knob position.

Peter Lines
'86 4kq