INTERMITTENT IGNITION ISSUE

You are on the wrong track with alternator testing, and I've preached this before: Test it YOURSELF ON THE CAR

The VR is what causes the alt to produce voltage. If the alternator is producing voltage--and too much--on it's own, then the green wire field terminal is grounded, or the field is internally shorted to ground

You have a 50-50 chance there. If the field is grounded, you may get the battery side (blue wire) on the GROUNDED side or the "safe" side, and THAT will be a blue smoke deal.