I have been having this same problem. The switches are so simple, I have a hard time believing they can wear out or break. I have cleaned all the connections and checked all grounds and so far so good on mine, but I have not had it out for a drive yet.
P.S. there might not be enough wire to pull the switch out the front. there was not in mine. I ended up pulling too hard and losing the wire behind the kick panel. That sucks big time! Don't tug too hard.
There was 6 inches or more wire in behind the switch, so there was plenty to work with. That said one of the spade tips broke and I have to get another today. With that much wire left, I can only conclude that these are the original 42 year old switches. They had a good run, R.I.P.