1999 Plymouth Voyager Brake Lights

The third brake light runs on a curcuit by itself but does go through the brake light switch. If you have a static tester one that has a point on it and lights up when there is voltage. Start at the fuses again and work your way to the brake lights. See if you are getting juice to the lights. If you are then check the ground wire. When both lights go out 90 percent of the time its in a fuse or broken wire.