The relay that has that big fat coil/winding is the Cutout and one of its leads wires to the BAT terminal and another to the ARM/GEN. The Voltage/Curent control relay has smaller coil/windings and one leads to the FLD terminal.
The VR cant work right unless it has a good clean ground
If the gennys commutator is carboned or oiled up or if the brushes are worn down short there can be excess sparking and a jumpy ammeter i.e the genny may be the problem instead of the VR
If the relay contacts are burned/pitted/carboned that can also cause problems.
Ive seen ammeters that are bad and jumpy when all else is okay!!!!
By pass the VR altogether and see what the ammeter does??? To do that when shes running temporarily dead ground the gennys FLD post which takes the control relay out of the picture n see what happens??????? Then temporarily by pass jump around the cutout relay by wiring BAT over to the ARM terminal n see what she does while shes running??? If she charges good n smooth n steady while the VR is by passed but not otherwise, the gennys is okay so its a VR or bad grounded VR problem
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