I have a 1968 Buick Skylark Custom. 4 door, 350 V-8, 2 barrell. Been having charging system issues. If I drive for a while with the headlights and/or fan running, I usually find the battery low or dead the next time I try to start the car. Didn't seem like the battery wasn't charging at all, just like it wasn't getting enough charge. Put in a brand new Delco battery, and a new alternator and voltage regulator. After installing the new alternator, started the car and the voltage regulator started to smoke. My mechanic suggested that the regulator might be bad, so I replaced it with another one. Same thing. Smoke from the resistor in back of the regulator. I don't understand exactly what has happened. I don't think I could have connected the alternator wrong. Maybe a short somewhere? Any help or suggestions would be greatly appreciated.