Ive tried to test the diodes after doing some research online but can't seem to figure out what I'm doing. After reading somewhere that you can disconnect the DC portion of the machine, I thought that I would give it a try to try to isolate a short. After I removed the power supply to the stabilizer and turn the machine on it hums along nicely and when I turn it off there is no bright arc at the switch.
So I feel that I've got a short somewhere in the DC side of the machine. Will bad diodes cause this or is there another problem? I currently have removed the entire DC portion from the machine and have it on the bench for testing (or tossing out).