Not on a hotrod, it's on my 46 Willys Jeep. It uses a (not sure how old?) SIGNALSTAT 900 switch mounted to the column: It's always works perfectly for the 12+ years I've owned the jeep, except lately I've noticed that when I turn on the driver signal light, it turns on but it does NOT flash on and off. It stays on constant until I put the lever back to the middle position (off). Passenger side flashes just fine. When I put the hazards on, both sides flash on and off as they should. I've replaced the flasher, and it's still behaving the same. Any ideas on how to fix this? I don't even know where to start, since clearly electricity is getting to the bulb, I can't see how it would be a bad wire or a bad connection or whatever.