Alternator polarity?
this might not be exactly your car (wire colors might be different) but what you basically have
The Alternator you should have (square back, 2 field wire)
The Alternator you probably have (square back, single field wire)
What you don't have (round back, single field wire)
I forgot to mention that the 0.5 ohm number is just my best guess of the resistance the field coil would have, but you get the idea