I am assuming you are not showing continuity through the switch, correct? Try moving the lever while you have the ohm meter hooked up to the wires for the passenger's side to see if you can get continuity through it somewhere.

I had the same problem in my Dart. I hunted and hunted. Changed out switches and put a longer screw in the lever and that fixed it.

Like I said lots of hunting until you find the problem! And sometimes it doesn't make sense.