Well, the post was being responded inside quotes, without a color change, so i missed it at first. Don't see Jerry. So I hesitate to enter the "Twilight Zone" BUT.......
1. Don't test the alternator that way! Put a multimeter on battery to see static at 12.6V and running at 13V-14V.
2. Slow crank troubleshooting is cable clean, then have battery load tested, then starter check, bypass ignition switch and on down the line.
3. Voltmeter will drop for a few seconds when a new load is presented usually.
4. The best approach on Stovebolt is to tell us the issue you have before doing anything, just to get our questions so we can suggest ideas and tests.
I ask that comments and answers NOT be inside quotes, unless with a color change. Tuff on an old guy.