The headlights in my '55 will start blinking on & off at random after about 15 - 20 minutes of night driving. If I turn off the switch for a bit then they will burn for a while longer before doing it again. It is only the headlights that are faulty. The headlight switch was replaced...no help. I replaced the halogens with the original type, but no help. I do have LED's in the tail-lights, but changed them out also...no help. Headlight harnesses are grounded up front. ????