Did some resistance tests and found the yellow wire open circuit. So I borrowed a flywheel puller from a friend and pulled it off today. Low and behold I found the problem. Looks like at some point part of the stator broke off. The broken part was not in the case so I assume the previous owner must have removed it. Then the coil wires must have slowly rubber through on the flywheel. I am going to try and repair it myself, but if that doesn't work then I guess a new stator will be needed.