I notice the blower motor barely rotating, during AC maintenance. Therefore I troubleshoot the three phase motor. I need to determine whether the motor is faulty, or something else in electrical circuit. I find the blower motor wires melted. Next I notice the middle contact for contactor was missing. The blower motor was electric not receiving 2 of three phase. Therefore the magnetic field needs to correctly rotate the blower motor was missing. Furthermore I find a broken contact point on the blower motor contactor. I replace both contractors and test operation of air conditioner and blower motor.