86 300sdl, battery boiled over, and I lost a few headlights????

My battery boiled over and gassed me out of the car....Do I need a new alternator or do I just need a new voltage regulator or was the battery letting the voltage regulator stay on ?????Help...

Because this is a safety related issue, in that it can potentially be a fire hazzard if not correctly repaired, I would recommend having this diagnosed by a professional near you. I WOULD NOT recommend that you diagnose this and/or attempt to repair it yourself. To answer the question, though, typically when a voltage regulator fails, it does not charge at all. You could have faulty diodes inside the generator causing the boil over. Have it checked by a professional.