Hey Marc, the leads that go to T11 and T12 are mains (AC) current. The black wire goes to T12, and white to T11.

Wow, you guys are really amazing. Are you actually working on a Dremel 4000? Mine looks exactly like the pics. It has a hangar on it, as well as a collet nut.

Dam Jeff. I am not sure if you are being sarcastic or not, but maybe you should go lie down for while.