ok... latest update. it is a 6V battery. VR is a NAPA # VR-851. On the cutout relay- the "flicker" on shutdown before return to 0 is exactly as i've observed.
i opened up the VR and started the tractor. at mid-high rpms: if i connect a jumper wire between the 2 sides of the regulator relay (not the contact material themselves, but the metal parts), it pegs the ammeter- just like grounding the F terminal. So that tells me that the VR ground is fine. so remove that wire. the regulator relay looks like contacts are closed ie if i push on the relay, i can't feel any movement to close it. the cutout relay is open. if i push it closed manually, it stays, and the ammeter registers about 5-6V discharge. at low idle, if i manually close the cutout relay, it then opens on its own.
So based on how I understand the VR- it looks like maybe the VR relay contacts are resistive, which means the cutout relay doesn't see gen voltage so it doesn't close? but that woudn't explain staying closed at high rpms. i tried polishing the VR contacts a little, didn't help.
i tried running a second wire from FLD to F, that didn't help either. measured resistance of about .4 ohm across the original wire.
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