So let me ask you this Del.
If he hits the brakes and the front turn filaments light, isn't that the turn signal switch jacked up? (assuming the grounds are ok everywhere)
In this case, someone who worked on the car before I bought it ran wire from the turn signals all the way back to the tail/brake lights. The park lamp filament lit up in both headlight switch positions, and when the brakes were applied the turn signal filament lit.
The added wiring was removed and everything works now. I did replace the turn signal switch attempting to fix the problem earlier this week.
