[pjmoreland]

You're getting 12V on the white wire from your brake switch to the turn signal switch since your right brake light is working. The yellow wire from the turn signal switch connector to your left turn signal/brake light filament is working since you have a left turn signal. You could check the yellow wire coming out of the C shaped turn signal connector for 12V when pressing the brake pedal. I'm guessing you won't find any voltage there.