I can understand what you're saying...but I would like to know the cause. If I do buy a new switch and then have a problem, then what?? Not trying to waste anyone's time, and whats wrong with someone trying to help another out? For all I know, the switch could have been replaced already...just because its 40 years old doesn't make it bad. If that was the case, I'd be replacing every single original part on the car.