I made the mistake (go ahead and kick me) of putting a NAPA Chinese re-manufactured alternator on my '70 Dart in February. It was defective and both field terminals were grounded.
WAAAAAAYYYYYYY too much of this. Many rebuilds seem to come with at least one field grounded, so if the customer is unaware, they have a 50-50 chance of getting the switched 12V hooked to the grounded terminal