The lowest ohms setting, then check berween the motor leads, then put one lead on the motor case then check each lead from the motor to the case. I'm inclined to agree with Mike, stiff or damaged bearings can get you in two ways...if you lose clearance because of a worn bearing the rotor and stators can touch and then if not that the increased torque from as bad bearinmg can overamp your motor. How many amps is the motor rated for and how big is the breaker on the generator??