The genny and VR connections are all across the 24 volt series sum and (if alls well?????) should have nothing to do with frame ground. The reason theres an A1 and A2 is so neither has a frame ground connection like on a 12 volt system with only a single A terminal because the other brush (which would be A2) is grounded.
If unhooking wires and/or road vibration seemed to get things working, Id be thinking of a loose or corroded connection problem or perhaps theres an internal genny problem (brushes, brush holders, field or its splice etc)
These 24 volt systems are hard to diagnose if there armed with a VOM let alone over the internet so sorry, I just cant say sittng here if its a genny or VR or wiring problem, but if shes NOT charging the idiot light is supposed to be on, its sort of like a light wired across the VR's internal cutout relay where if the gennys output (A1 and A2) is coupled up to the battery the voltages are the same so the light goes out.
I DONT KNOW SITTING HERE WHATS WRONG maybe Tx Jim does?? Hes sharp as a tack on these and I havent sold or worked on them for years grrrrrrr
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