[dmjlambert]

I'm looking at the wiring diagram and notice the blinker power does not go through a fuse, but the brake light power does go through a fuse, although both of those wires light the same elements inside the bulbs. So, pull that brake light fuse, do an outstanding job of cleaning the fuse holder to get rust off of it. Perhaps use a dremmel tool or little wire brush. Then put a different fuse in there just to eliminate the fuse as a problem.