You cannot disconnect the series field from the GSEF. It is wound in the pole piece so the self excited field can build. If you listen and do what I told you can get all the fields in sync, The suicide circuit using the SUD relay could have an open resistor. Also on some controllers a breaking contact on H is used in suicide circuit, Does you generaror have taps on the pole pieces, or an extra series field wire coming out to controller. There is no 65 Generator, some dumb ass in the UK stamped it wrong. I had 4 controllers in the Bahamas from UK and I had never seen so many factory wiring mistakes. First time power was applied transformers smoked for touch buttons. Awful Quality. You will notice there is no way for the GSEF to get any external power to the field, it is done with induction via the leveling field to get the build up started. Also all the speed steps pull in all at once,