[Steve Davis]

Louis, there should be continuity between all pins. Hold the plug with the pins facing you, start with the small pin. It is connected to one end of the transformer primary. Moving clockwise, the next pin connects to the primary center tap and one end of the field coil. The third pin connects to the other end of the field coil. The last pin connects to the other end of the transformer primary. Which pin is open? If it is the small pin or pin four, the transformer is bad. If it is pin three, the field coil is bad. It could be as simple as a broken wire. The field coil should read about 2700 ohms and the transformer primary should be 200-300 ohms.

Steve