The plug has 2 prongs. To test the ground problem I used the ohm meter to test the resistance between the prongs and the car's frame. I noticed something strange though when I had the positive prong hooked up and I pressed the switch. The resistance on the ohm meter went to infinity. This only happened in the front, not the back. I remember from physics class that V(voltage) = I(current) x R(resistance). So, if the voltage was increasing when I hit the switch and the resistance went to infinity, this meant that there was little or no current. When I thought about this more, I realized that maybe I should check out the switches more (maybe they are dirty or something and so not passing any current). Sure enough, it was the switches! I was thrown off before when I tested the switches and I saw the correct voltage change, I needed to see that they weren't passing any current to see the problem.
It all works now!!! Thanks to Blondestar - 'ohh...you wouldn't believe it...the switch is actually bad'
Thanks for the help though BMWLotAttendant and 94 325is!
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