2 wires for alternator but three connectors, which two?

Thanks guys, I would assume I have the same VR that came with the car (or one similar if it had been replaced by a previous owner) NOTE I just checked and the VR is older style.

67Dart when you say open to ground, do I check resistance from the terminal to a ground point and look for 0's on the meter? Sorry, for my lack of understanding with the terminology.

So if I'm reading correctly just ground one of the spade connectors and all should be good?