That 20 amps with a dead grounded field sounds like the genny is fine. As far as a jumpy needle (if excess) , that can be due to several things such as: Loose brush hold down springys,,,,,,too short brushes,,,,a dirty oily or rough or not properly undercut commutator,,,,,,,,,burned or carboned relay contacts in the voltage regulator,,,,,,,, a loose connection especially a bad loose ground somewhere,,,,,,,,a faulty ammeter.
Id be tempted to clean n polish up the gennys commutator and maybe run a dollar bill between the VR"s relay contacts to clean them and check n clean the grounds n wiring connections
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