I had the same problem when I installed new tail lights,it is in the ground if the other light are bright.Your main wiring harness for your rear lights run down the drivers side,then everything pigtails off to the right side.Start with the left light and make sure the bulbs are making good contact,turn on turn signal and wiggle the bulb and see if it gets bright and if it does do a little cleaning there.Get the left light working first,don't even hook the right light up yet.Then check the wiring for nicks and cuts.If you find blue corrosion check it real good.You might have just a couple of strands of wire holding it together,but most important is all the grounds.A Simple way to check them is with a good test light.Do a reverse with your test light,hook the clip to a hot wire and stick the needle end of the test light into the ground.The test light should burn bright,if it doesn't then you have a weak or broken ground,the ground in your rear pigtail is probably the culprit.Another way is to get a piece of wire and hook one end to the ground to the light,scrape you a clean place in the frame and hold the wire on the frame and let someone work the lights and see if that works.

The key switch problem is probably a different problem,you are looking at buying a new key switch.This is inside the steering column.take the sides off the column and find the switch with a bunch of wires that unplug from the main harness.That is your key switch.Hope this helps. <img src="/forums/images/graemlins/patriot.gif" alt="" />