Hello electricpete - first location of the cut wire was the 2 wire that comes out of the rotor to connect the diode circuit on the excitation. The second location is the rotor winding near to the middle of one of the poles.
The rotor winding of one of our genset in our DP vessel twice failed because of the rotor winding gets cut after few days of operation. Both times, the winding gets cut at different location of the winding.The genset rotor was overhauled, rewinded, baked , rotor balanced, refitted and tested 2...