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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Today's Featured Article - Tractor Profile: Earthmaster - by Staff. This tractor, manufactured by the Earthmaster Farm Equipment company in Burbank, California was made for only two years. The Model C came out in 1948 and was followed by the "CN" (narrow-width model), "CNH (narrow-width high-crop model), "CH" (high-crop), "D" and the "DH" (high-crop) in 1949. The main difference between the models was tire size, tractor width and cultivating height. The "D" series were about 20 inches wider overall than the
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