Got a 70 Mach 1 Was riding it the other night and the headlights suddenly went out. Dash lights and markers stayed on. Just the headlights. They went back on in a couple of seconds but went off a couple of seconds later. I then hit the brights and they came back on but only to go out a couple of seconds later. I turned my dash lights down and turned the foglights off and they seemed to stay on then. Any ideas what could be wrong. I did replace the headlight switch a few years ago.