Now working on several Dodge diesels. Problem of the moment is that the '94 2500 does not charge properly despite a new alternator and the trans does not lock-up properly. I've found that the relay controlling the alternator regulator switching has no power. It has no power as the 30a "Megafuse" blows immediately on installation. Without proper voltage the trans does not work as it should either. Engine starts and runs fine. What I would really like to find is a schematic of only the circuits that depend on the (#4) 30a megafuse to ease tracking down the short.