Brake light issues

Start with changing the bulb. I've had cars that would do weird crap whenever one bulb would blow. Cheap fix...or at least a cheap way to rule out one possible issue.

Take a look at this message thread:
http://www.stangnet.com/mustang-for...-hazards-and-brake-lights-not-working.619109/

I am new here and so not sure if I am going about this right. I work on a friends 89 LX. Every time he has his dash worked on the car comes back with bad signals. It is always the same. The left blinker is ok but in the neutral and right positions the hazards dimly blink (both left and right). I have fixed it twice by getting the switch harness wiring in the right order but this time that did not help. Any ideas?