Let me ask the question a different way then previuosly to see if there is some help out there.
I replaced the starter solenoid on my 78 CJ5 304ci as it failed and kept the starter engaged. (burnt out the starter). I replaced the starter and the solenoid.
Voltage on the 'blue wire' from ignition to terminal says 12V when activated but solenoid will not 'click'. Tried the old solenoid (with starter cable disconnected) and the solenoid activated (but i know that the internals are bad) and it 'clicked'. I then applied 12V directly to the the new solenoid from baterry post and it clicked. So I think that there isn't enough power from the ignition switch to pull in the solenoid.
Does this make sense? I read somewhere that in older vehicles the wiring over time increases its resistance and could cause a voltage drop, which is not strong enough to activate a new solenoid. The work around is to install a relay (horn or other) and use the 12v from the battery through the relay to activate the solenoid.