Kool177's turn signal problem just reminded me of one I have on my 86 Silverado. The turn signal works fine, but when it's real cold outside, the left rear brake light won't work. Since the filament for the turn signal and the brake light are one and the same, I assume that the problem is in the brake wiring. I pulled the connector off the back of the housing, thought I found a loose wire going into it, pushed it in to make better contact, but the problem still persists sporatically. Could the brake wire be broken somewhere, and because cold contracts it, it looses conductivity? If so, how could I locate the break?