[ndnchf]

There is only one correct way to wire the fields. Over the period of model A production. They grounded fields 3 different ways. How are yours grounded? What is the resistance through both fields? It should be .9 - 1.0 ohms. Did you check the armature for opens, shorts and grounds? Any one of these 3 can cause problems. Did you sand in the brushes for full contact? Lastly, are you certain the cutout is working properly?