The handle itself does the clicking. It doesn't matter if the cable is connected or not the handle should still click when you pull it up. Another thing to check for but wouldn't have anything to do with your not clicking problem is making sure the bell cranks are operating properly.hmm, theoretically, if the cable had too much slack wouldn't that explain it? the ebrake reaches its max distance before it can supply enough tension to make the adjusters "click"?
just thinking out loud.