First off I'm new here, so please be patient. I'm trying to fix my cousins Wrangler for Christmas. Her Four Wheel drive has never worked since she got it used. It's a 94 by the way. I read the checking vacuum write up and install writeup as well for the actuator motor. I've got 2 vacuum lines into the front end, and 3 into the transfer case. I'm kind of unclear how to check the T-case switch? Which one of these is the most common to go out? All the lines look good so I figure it's gotta be one or the other? I have a 4runner so I'm kind of new on the JEEP thing. If someone could help i'd appreciate it. We're all tired of pulling her out! Please let me know, thanks.