Check the cores in the Struther-Dunn relays(10 and 11 I thik) on the back side of the controller. These control the Low speed compounding and High speed compounding. If these contacts don't make and break correctly, it will cause stalling at low speed. Also, CAREFULLY clean your generator commutator. Don't mess with the glaze. Glaze should be a chocolate color. Check brush tension and replace springs if necessary.
