Your alt can be fubar'd and still show fine on output tests. But if the diodes have screwed the pooch or the brush wires are grounding internally (mine did this) it will drain your battery. Best way to check for draw is to hook up a meter between positive cable and +battery terminal, leave everything turned off and see what the draw is off the battery. Anything higher that a few hundreds of a volt is to much. With meter still hooked up go around disconecting things....pulling fuses. When the draw on the battery drops you've found the problem.

~Darin <img src="/forums/images/graemlins/baby.gif" alt="" />