If I had to guess, there must be a damaged wire between the tail lights and the power supply. It could be a break in the wire that is internal making contact at times and not at others. Make sure the body grounds are ok. If they are and you're sure you have a good ground, the last thing to do is trace the wiring looking for the problem (which is a pain). Before you co crazy doing that make absolute sure the sockets are good.
Let me know what you find.
Saturday, February 14th, 2009 AT 1:38 PM