Originally Posted by sasquatch

Remove the taillight assemblies. Take out the bulbs. Take a close look at the round metal contacts and see if you can find any areas where the metal busing looks like it was melted or pitted. Clean the area and use some good quality solder to fill in the holes/pits. Sand, grind, or file smooth and flat with the metal. Reinsert the bulb and reinstall the tailight. Problem solved.