not charging properly

Ok, well that would make sense for a partial short under the dash, perhaps on the output side of the ignition switch if it is not there all the time. The ammeter shows the short current but it sounds like not enough to blow the fusible link. Or the PO removed the fusible link and you have no emergency fusing from the battery! OR the PO ran the current the starter solenoid from the ignition switch and took out the starter relay.....! With all the rewiring, we have no way to know, unless the PO left you a diagram.