your missing the important item to prevent that... a zip tie holding the actual wire to the solenoid... the wire will vibrate if not... viration killed the terminal..
That's what I thought also. The spade on the harness is just a bare terminal with no mating housing to the solenoid spade housing. Plus, the wire with a sheath has hardened with age and is very stiff.
Lucas, tell 'em about the time the tail on that coonskin cap of yours got caught in the fan belt and almost costed you your life...... 
Some things are better left a mystery...I just have a lucky skull that is harder than a woodpecker's lips. I may post a pic of me in the cap, but that is about it.