[Bill OH]

I had the same problem. I removed and opened the generator and cleaned the field and armature connections inside, tightened brush connections and cleaned commutator with fine sandpaper. Problem solved. You might consider checking continuity between the case of the generator and ground on the regulator. I used a digital ohmmeter and found 0.1 ohm resistance. I ran a 16 ga wire with soldered connectors from the generator case thru the spark plug wire loom to a mounting screw on the regulator - that removed the 0.1 ohm resistance and stopped the ammeter from jumping.