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The TM shows how to adjust the regulator. Might need a tweak. Assuming you have the 60amp smaller one, which is a very common design on green machines by the way, it can be quickly adjusted or the regulator replaced. Mine tired out from age and dust from the brushes, a new regulator end plate...

My bad, I didn't notice the companion thread. Yes, same box influences both. Sounds like the box to me. I defer to those who know more about the control box, in your other thread. Bulldogger

Could be several things, but hopefully not the engine controller Have you checked the generator at the output, to verify the voltage swings manually (apart from the mil gauge)? You might also check your voltage regulator. The TM explains how. Not sure which generator you have, or if you have...