You are correct Joey. The locking hubs were an aftermarket accessory well into the CJ5 production. What turned the corner for Willys and later Kaiser to start putting them on from the factory was through the competition putting them on their units as a selling feature. International Scouts had IH branded Warn locking hubs on their vehicles, then Ford followed suit on the Broncos.

More information than you could probably ever want to know from eWillys.com;

http://www.ewillys.com/?s=locking+hubs

On the electrical side of things, it would appear that you do have some rather high resistance.