New alternater & voltage reg - not charging

Once again, with the engine running, I used the probe from my meter to jumper the green wire to the blue wire at the voltage regulator (connector unplugged) and there was the predictable spark and the engine slowed slightly and the battery gauge on the dash showed that the battery was getting a charge.

If this is so, then your alt is OK, because you are charging when jumping the regulator.....replace your regulator again...hopefully getting a good one this time. You can buy brand-new, faulty parts you know.