Mark, a bouncing/vibrating ammeter needle is the classic symptom of a generator that needs polarizing (as covered earlier, engine off, momentarily jumper the BAT and ARM - sometimes marked GEN - terminals at the voltage regulator). But a V/R that is failing might cause similar symptoms, as may grounding issues. I'm sure you know, but the 6V system is hyper-sensitive to connection quality - grease, paint, corrosion free and tight - which applies to all ground connections (battery to engine/body/frame and between each) as much as positive/power connections. Adding a new, separate ground wire from generator body to the V/R mount might help, as well.
The suggestion from Otto to separate the issues and systematically work through them one at a time makes sense, of course.
Hope some of this helps!
Doug
Last edited by drdoug; 08/08/2022 3:01 PM.
