LED signal lights on a 74 Dart

Had the same problem with flasher , I replaced flasher with a Tridon 552 DOT . And everything works well with LED bulbs .
Yeah I thought I made that clear, the hazard flasher mounted to the fuse box is original stock and works fine. The signal flasher mounted by the ash tray is the one I'm fiddling with. I've tried 3 different LED flashers and 2 different incandescent flashers. LED flashers don't come on at all the incandescent flashers come on solid but don't flash.
2 wire. Hope it will help you.