Alt. guage discharging all the time???

If the previous suggestions do not work, check the leads to the Ammeter gauge. The black lead goes closest to the outside of the car. Since the gauge measures current flow, it doesn't really matter to the gauge which lead is which it terms of rendering a reading. However, for the reading to correspond with the label on the gauge, in this case, it is necessary to have the correct polarity on the gauge leads. As you're looking at the gauge from the driver's seat, black wire goes on left post, red wire on right.

If the gauge should fail, the car will start but dies as soon as the key is released into the run position. If that should happen and you still need to use the car, put both wires on one of the ammeter posts, by-passing the ammeter.