I wouldn't worry about re-wiring ammeter unless you see a load indicating charge (instead of discharge). Just connect a headlight bulb or any substantial load to the non- battery side of the ammeter & watch indication.
Yes, on your VR ground question, ground is the case.
If you are interested, I can't tell you how to test the regulator without more equipment that about 99.44% of tractor owners are likely to have available, but by process of elimination, I can tell you how to make it charge without VR, thus proving generator is good (just re-built, so I guess you know it is good) and that problem would then be VR or wiring.
And my procedure does not matter whether it is "A"-ckt or "B"=ckt.
This post was edited by JMOR at 20:29:45 10/24/13 2 times.
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