Did mine today on my "64 Grand Prix. Headlight switch is different on these, as anyone who's searched for one knows, it takes a #1995120 or #1995119 switch, which is the same one for a '63 Tempest. Anyways,that being said, on this car with either of those switches, you need to take the purple wire from #7 and put it in the empty #4 spot,not #3, it's already being used. This worked fine for me. Any other '64 GP owners find this to be the case also?
Terry