You are right, you can't do the stator test without the cover on because the stator wouldn't surround the rotor. I was not testing the stator, I had put one on and was ready to test the charging -- I think I may have put on the cover but neglected to put in the bolts. I was intent on watching my meter then looked down and saw the cover off and lots of oil on the floor but since I did not see the plug on the floor I was unaware there was one. It had shot out a couple feet and landed in with my tools. Or I may have overlooked the cover altogether, more likely.
A result of attending to too many things at once and running from garage to house and back, you lose focus. I appreciate your help.