[Bulligen]

This could cause some of the ignition problem, I think a new brass wired distributor would be best to pick up. Sounds like your lighting issues are robbing power from the ignition as well. The fact that it came up when you were driving with your headlights on is a clue towards the root of the problem. That amp gauge it telling you that there is a major draw or short somewhere. Keep being aggressive with it, you will figure it out.