So basically, you are saying, if you drive with a major accessory on, such as headlights, the battery goes dead? I am assuming the battery has been tested and is good?
I had a 77 for a while, its charging system was always testy. I kept cleaning connections and replacing regulators for a while and eventually found a loose spade terminal at the alternator. Re-soldered it and all was good. Mine would either over charge and blow lights, or not at all though. It should return to near zero once it is charged up...this is normal...you are correct, when something gets turned on that draws a good amount of power, the alternator should compensate. Cool old vans.
Last edited by Daytrepper; 01-20-2014 at 08:43 PM.